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| Tips for Welding Aluminum in the Shipbuilding Industry |
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Posted by: aluhm - 02-24-2018, 02:21 AM - Forum: Knowledge & Technique
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Aluminum alloys are lightweight and corrosion-resistant in marine environments, making the superior material for use in the shipbuilding industry.
There are two aspects that make general aluminum welding different from welding steel in the shipbuilding industry, and both are related to the fact that much of the welding is performed outdoors:
Storage of aluminum plates and extrusions is critical to avoid oxidation
Extra care must be taken to avoid breezes in the welding area
Both aspects will be discussed in more detail on the next few pages.
Know Which Aluminum Alloy You Are Welding
It isn’t enough to know that you are welding aluminum. Welding professionals have to know which alloy is about to be welded, and they have to know the correct filler metal to use. The most common alloys used in shipbuilding are the Al-Mg 5XXX sheet alloys and the Al-Mg-Si 6XXX extrusion alloys, primarily because of their excellent resistance to corrosion.
Most aluminum alloys are easily arc weldable. Virtually all of the alloys in the 1XXX, 3XXX, 4XXX, 5XXX and 6XXX series can be arc welded using GTAW and GMAW. However, most of the alloys in the 2XXX and 7XXX series cannot be arc welded. The only arc weldable alloys in the 2XXX series are 2219 and 2519. Almost all of the other 2XXX alloys will crack severely when welded. Similarly, the only alloys in the 7XXX family that can be arc welded are 7003, 7004, 7005 and 7039.
Specifically, be particularly wary of 2024 and 7075. It is tempting to buy one of these alloys for repair welding because they are strong and commonly available, but they are crack-sensitive to arc welding.
Welding an “unweldable" alloy or using the wrong filler alloy can result in immediate cracking or a premature failure in service at a later time.
When Should You Preheat?
Some people believe that all aluminum welds, both GTAW and GMAW, should be preheated. This isn’t true. In fact, if you have the correct equipment, preheat is rarely necessary.
Additionally, excessive preheat can severely degrade the mechanical properties. The last step in the heat treatment is aging, which is conducted at temperatures between 325 and 400°F. If you preheat to or above the aging temperature, you will ruin the alloy’s mechanical properties.
This is not to say that all preheating is bad. For example, if outside temperatures and humidity are very high, it is acceptable to preheat to 200°F to drive off moisture. Just don’t get carried away.
Storage of Aluminum Sheet, Plate and Extrusions
For most industries, the standard recommendation is to store aluminum inside prior to fabrication. While that is a good recommendation, it probably is unrealistic in the shipbuilding industry, where most welding is performed outside. There are more realistic storage recommendations for shipbuilding.
First, if at all possible, do not stack the aluminum plates in a flat stack on the ground. Storage in this way traps water between the sheets, increasing corrosion rates. Instead, stack the plates on edge to allow water to drain between the pieces. If sheets must be stacked flat, remove any paper interleaving or packing from between the plates. If left in place, the paper will act as a wick and draw water into between the plates. If the sheets are stacked flat, try not to stack one sheet directly on top of another. Instead, insert small wood or aluminum “stickers” between the sheets to let water drain.
All of this is intended to minimize the amount of corrosion, i.e., thick oxide that can form between the stored sheets. Any thick oxides will need to be mechanically removed before welding.
Make Sure You Clean the Parts Adequately Before Welding
Cleaning aluminum before welding consists of two separate and distinct operations. First, all oils, lubricants, machining coolants and other hydrocarbons used in manufacturing must be removed. Any hydrocarbons remaining on the material will get into the welding arc and release hydrogen gas, which causes weld porosity.
Removing hydrocarbons can be done in one of two ways. The most common is to wipe the plate with a clean rag saturated with a good degreasing solvent, such as acetone, toluene, MEK or carburetion cleaner. (Alcohols are not good degreasers and should not be used to clean aluminum.) Alternatively, but less common, the aluminum can be dipped into a tank containing a mild alkaline solution, then rinsed and dried.
Secondly, remove any heavy oxides from the aluminum before welding. This is normally done by hand or mechanically using a stainless steel wire brush. In cases where the materials are stored outside and develop a heavy gray oxide, it may be necessary to remove the oxide using a sanding or grinding disk.
Use the Correct Equipment
Before beginning each shift, welders should make sure the welding equipment is correctly set for aluminum. This is especially important if the equipment is interchangeably used to weld different materials.
Specifically for GMAW welding:
Make sure the spool brake is not set too tight. Excessive tension will cause wire feeding problems. The brake should just be tight enough so that the spool doesn’t freewheel when the wire is stopped.
Make sure the drive rolls are made for aluminum and have the correct diameter. Using V groove drive rolls, which are made to weld steel, on aluminum will deform the aluminum wire and cause feeding difficulties.
Set the drive roll tension only tight enough so that the drive rolls don’t slip on the wire. Excessive tension will cause the filler wire to deform.
Make sure the correct plastic inlet and outlet guide bushings are in place. Use of the steel parts used to feed steel wire will cause feeding problems.
Make sure the gun liner is the correct plastic material used for aluminum. Use of the helical steel gun liner typically used to feed steel wire will take small shavings off the soft aluminum wire and cause the liner to clog up.
Make sure the contact tip is the proper size for the aluminum wire being fed. Some people believe it is a good idea to use an oversized contact tip – for example, a 1/16-inch contact tip to feed 3/64-inch wire. DO NOT DO THIS. The tip must be of a size to freely pass the wire through but still tight enough to provide uniform electrical contact between the contact tip and wire. An oversized contact tip will not allow uniform current transfer, resulting in an excessive number of burnbacks.
Use the Correct Shielding Gas Flow Rate
Argon shielding gas flow rates should be a minimum of 35 SCFH for GMAW and 25 SCFH for GTAW. If a large diameter gas cup or gas nozzle is used, flow rates should be increased for both welding processes . If the welding is done outside, the shielding gas flow rates should be even higher – 45 SCFH minimum for GMAW and 35 SCFH for GTAW - because Argon gas is lighter than air and more susceptible to wind and breezes. The lack of shielding gas around the weld puddle will cause porosity. If the shielding gas is an argon/helium mix, the flow rates should be increased by about 25%, since helium provides little cleaning action.
Once the Weld Area Is Cleaned, Keep It Clean
Once the individual pieces are clean and fit up, make the weld as quickly as possible. The primary concern here is not that the parts will oxidize – at room temperature, aluminum oxidizes slowly if kept dry. The real worry is that dirt, oil, water vapor, etc. in the shop environment will contaminate the cleaned material. Once cleaned, fit and assembled, do not let the parts sit unprotected overnight or over the weekend. If the parts must remain unwelded for a period of time, put brown craft paper over the weld seam and tape it in place.
Store Welding Filler Wire Correctly
Aluminum filler wire should be stored in a clean, dry environment, preferably in its original packaging. Under such conditions, the wire has a usable shelf life of several years.
While the wire doesn’t need be stored in air-conditioned surroundings, it does help to store it in conditions of low relative humidity. It must not be allowed to become wet.
The easiest way to do this is to store the wire in its original packaging in closed metal cabinets, which contain an illuminated 60-watt light bulb. The light bulb’s heat will raise the temperature inside the cabinet by 10°F or so, lowering the relative humidity.
Rolls of wire that are partially used should not be left uncovered on the welding machine overnight. They should be returned to their original packaging. Alternatively, there are plastic spool covers available to mount on most wire feeders. Keeping a spool of wire in the feeder until the
spool has been completely used is fine.
Storing wire in an air-conditioned environment can also cause problems. If the wire, which is relatively cold, is brought out into the shop on a hot, humid day and opened immediately, it is possible for the humid air to condense on the wire. If the wire is stored in an air-conditioned room, be sure to bring it out into the shop and sit unopened until it has warmed up. In fact, storage in a dehumidified room is preferable to storage in an air-conditioned room. However, neither is essential if the wire is stored as recommended above.
Weaving and In-Line Oscillation
While everyone agrees that side-to-side weaving across the seam produces excessive heat input and should not be used, it is very common in the some industries for welders to use an in-line weave or “shuffle.” The purpose of the shuffle is to produce the “stacked dime” appearance if the weld isn’t too large. The main advantage of this technique is that it produces obvious regularly spaced weld ripples similar to a GTAW weld. However, the shuffle does not produce improved penetration or cleaning, or a better weld quality. It is merely cosmetic.
Shuffling is fine as long as the amplitude of the shuffle is controlled. It should be about 1/8 inch to 3/16 inch (3 mm to 5mm). If the amplitude of the shuffle is greater than this, it can produce low spots between each weld ripple. This can reduce the weld throat and is not acceptable.
Make Sure You Are Using the Correct Filler Alloy
The most common applications in shipbuilding are joining one of the 5XXX Al-Mg sheet/plate alloys, such as 5052, 5154, 5454 or 5083, to themselves or for joining one of the 6XXX extrusion alloys to a 5XXX alloy.
For joining the 5XXX alloys to themselves, the correct filler is 5554 for welding 5154 or 5454. For welding 5052, 5356 should be used. For welding 5083, which has a higher strength, 5556 or 5183 is recommended because 5356 does not quite match the strength of 5083. 4043 filler should not be used to weld 5XXX alloys, except for 5052, which has low Mg content.
For joining 5XXX sheet or plate to the 6XXX extrusion alloys, such as 6061-T6, the recommended filler alloys are 5356 or 5554. 4043 filler is not commonly used in shipbuilding because of its lower corrosion resistance. There is no advantage in using the higher strength fillers 5183 or 5556 in this application. Some suppliers will try to sell these alloys for this application because they are higher cost, but they are not beneficial.
We have attempted to give some guidance that is helpful to aluminum welders in the shipbuilding industry, though it is by no means comprehensive. Hopefully, this article has given you a few more ideas on how to improve your aluminum shipbuilding welding skills.
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| 5454 aluminium plates for shipbuilding |
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Posted by: haomeialu - 02-24-2018, 02:03 AM - Forum: Knowledge & Technique
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5454 anti-rust aluminum alloy plates is approximately 20% stronger than alloy 5052, and its properties is roughly similar with 5154. However, in some vicious environment, 5454 has a better corrosion resistance than 5154.
5454 aluminium plates is an alloy in the wrought aluminium-magnesium family (5000 or 5xxx series). It is closely related to 5154 aluminium alloy. As an aluminium-magnesium alloy, it combines moderate-to-high strength with excellent weldability. Like 5154, 5454 aluminium is commonly used in welded structures such as pressure vessels and ships. As a wrought alloy, it can be formed by rolling, extrusion, and forging (although forging is not common), but not casting. It can be cold worked to produce tempers with a higher strength but a lower ductility. It is generally not clad.
- Typical material properties for 5454 aluminum alloy include:[2]Density: 2.69 g/cm3, or 168 lb/ft3.Young's modulus: 70 GPa, or 10 Msi.Electrical conductivity: 34% IACS.Ultimate tensile strength: 240 to 300 MPa, or 35 to 44 ksi.Thermal Conductivity: 130 W/m-K.Thermal Expansion: 22.3 μm/m-K.
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| Common problems and causes of 5052 aluminum sheet |
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Posted by: aluhm - 02-23-2018, 07:38 AM - Forum: Knowledge & Technique
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5052 aluminum sheet commonly used in the appearance of electronic parts or accessories, which is widely used in aluminum products, but the production has a number of common problems, such as aluminum sheet surface defects.
The problem of the oxidation of color, black silk, sand holes and other issues of 5052 aluminum sheet oxide is how to produce and what is the reason?
![[Image: 5052-aluminum-sheet.jpg]](http://thick-aluminum-plate.com/images/aluminumsheet/5052-aluminum-sheet.jpg)
There are many reasons of black silk of 5052 aluminium sheet, for example, like affiliated machine rolling oil drops on the poor management, the pressure is too large or too large in surface tension caused by indentation. If you go down the thin material rolling, these dark marks will become more and more thin and form the formation of dark or black line, sometimes it is even unclear whether oil or mark, even on the surface can not see the color difference. But after oxidation ,it is very obvious. For the customer, affirmation is to refuse if they see the inconsistent phenomenon appearance. After the oxidation, the emergence of black silk is one of the most deadly results. Once this happens, there is almost no room for survival, the loss and consequences are irreparable.
The second problem is the color difference. Generally used to make the appearance of the product, color difference is not to be. Any customer is unwilling to accept a similar "two shameless" products. To eliminate these problems, it is necessary to rely on the source column to control.
Sand hole is generally the internal structure, because of impurities in cast billets or vapor not removed, or other elements did not stir and other factors, so we should control the source of ingot casting.
5052 aluminum sheet elongs to Al-Mg alloy, cold forming has good processing performance, processing performance, good corrosion resistance, rust proof aluminum alloy 5052 is a most widely used, this alloy has high strength, especially the anti fatigue strength, ductility and high corrosion resistance, in the semi cold hard plastic is good, do not 5052 alloy used for the internal pressure of the beverage cover, the status of H19 material, do first oxidation treatment to improve coating adhesion and corrosion resistance, both sides painted after the tank cover forming processing, my company production of 5052 alloy lid material with good surface quality, stable performance.
5052 aluminum sheet of haomei aluminium is certificated to ASTM B209 and it can be cut to size at customers’ need. The primarily alloyed with magnesium and chromium which improve the strength of 5052 aluminum sheet Products with different thickness have different tensile and yield strength, as well as elongation, all of which live to international standards. plate is stronger than 1100 and 3003 and it is an excellent candidate for most processing techniques.
5052 Aluminum Alloy sheet is a medium strength alloy containing Magnesium as its major alloying element. 5052 Aluminum Alloy sheet has good workability, a high fatigue strength and is very good for welding. It has very good corrosion resistance to seawater and the marine and industrial atmosphere. Typical applications include aircraft fuel/oil lines, fuel tanks, other transportation areas, sheet metal work, appliances and lighting, wire, and rivets.
Performance advantage:
1,5052 Aluminum Alloy sheet has high plasticity, corrosion resistance, suitable for use in marine environment;
2, the surface of the Aluminum sheet without peeling, bubble, surface rough and local mechanical damage, the surface of the Aluminum sheet without cracks and corrosion spots and trace nitrate;
The company Haomei Industrial Co., Ltd. China's largest Aluminum sheet manufacturers and suppliers, the production of 1-8 series aluminum alloy sheets to provide you with the best price and high quality services
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| The wide application of high quality mirror aluminium sheet |
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Posted by: aluhm - 02-23-2018, 07:33 AM - Forum: Knowledge & Technique
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Mirror aluminium sheet refers to the use of rolling, grinding and other methods of processing, so that the surface of the sheet presents a mirror effect. Usually abroad, the mirror aluminium sheet adopts the method of rolling to create a roll material and sheet material.
![[Image: aluminum-mirror-sheet.jpg]](http://thick-aluminum-plate.com/images/aluminumsheet/aluminum-mirror-sheet.jpg)
At present, there are two kinds of widely used mirror aluminium sheet. One is the pure aluminium sheet, common brands are 1050, 1070, 1085. They have a high content of aluminium and the purity is more than 99%. 1000 series mirror aluminium sheet production is relatively simple, so the price is cheap .Therefore,it is a series of applications in the conventional industry. The second is alloy aluminium sheet. The main brand is 5005 aluminium sheet and 5657 aluminium sheet. The main elements of 5000 series mirror aluminium sheet are magnesium and the content is from 3% to 5%. Therefore, it can also be called the mirror alloy aluminium sheet, the production process for continuous casting and rolling can be oxidized deep processing. At present, it is widely used in oil tank, machinery and other fields. 5000 series aluminium alloy sheet is a mature aluminum series and has a good mirror effect.
Mirror aluminium sheet is widely used and it is also one of the main products of many aluminum processing enterprises. As a leader in the domestic aluminum enterprises, haomei Aluminum Industry has a stable production and sales for the mirror aluminum.In building decoration, electronic equipment and other fields of applied materials, the mirror aluminium plate is very common, such as lighting, reflector, solar heat reflective materials, interior decoration, wall decoration, household appliance panel, electronic product shell, furniture kitchen, inside and outside decoration, signs, logo, bags and so on.
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| The superior performance of aluminium tanker |
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Posted by: aluhm - 02-23-2018, 07:24 AM - Forum: Knowledge & Technique
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The superior performance of aluminium tanker of haomei Aluminum Industry:
First of all, the types of aluminium tank cars than the same size steel tank reduced by 20%, but the transport can increase by 30%. At the same time, because 5083 alloy of aluminium tank cars has high strength, corrosion resistance and wear-resistant properties, aluminium alloy tanker of 5083 super wide aluminium sheet welding is more durable, long service life, more economic and environmental protection.
Then, tank body with aluminium sheet has several advantages.
1. To realize the lightweight of car body;
2. Improving the corrosion resistance and the life of the tank;
3. Good ductility, eliminating some security risks;
4. High recovery rate of car body and more environmentally-friendly economy.
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| Aluminum Industry attacked ship aluminium sheet market |
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Posted by: haomeialu - 02-23-2018, 07:21 AM - Forum: Knowledge & Technique
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In 2017, the global economy was contrarian move. As a famous international leader of aluminium sheet and aluminium foil, haomei Aluminum Industry understood the environmental situation, restructuring, transformation and upgrading. From southern Guangdong and Fujian, to the north of Shandong and Henan, the company have signed the order of ship aluminium sheet with many provinces and cities, and open a new situation for the 2017 domestic shipbuilding market.
Hunan, Hebei, Shandong, Fujian and other places, relying on local water resources, have a lot of shipbuilding enterprises. Several parts of these places succession from haomei Aluminum Industry have purchased 5083 ship sheet, 5086 ship sheet, 5754 aluminium sheet and other products since 2016. A Hunan ship enterprise specially came to visit haomei Aluminum Industry, expressed a strong interest on the development of haomei Aluminum Industry and ship products and signed the first order of 30 tons on the spot.
To provide customers with better quality products is the persistent pursuit of haomei Aluminum Industry. Adjusting the direction, promoting the transformation and upgrading is the company weapon in the fierce competition in the market, It is designed to produce the haomei ship in this concept. The company uses the perfect technology from generation to generation to interpret the connotation of innovation and technology to ensure the excellent products, quality brands, and bring the greatest protection for customers. Therefore, the products are sold well in the world.
At the same time, haomei Aluminum Industry also focused on the development of the international shipbuilding market, and launched cooperation with many parts of Southeast Asia and North America companies. These results benefited from the well-known overseas brand, perfect service system, and thoughtful customer service. The intangible brand value of haomei has won the praise of many customers.
In the new year, economic development is bound to undergo a new test. But in the long run, it is also an important year for various industries to enter the decisive stage. We should be down-to-earth to understand scientific planning and development, and continue to build the quality of the brand to challenge the new market
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| prone aluminum plates Yards replacing corrosion |
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Posted by: aluhm - 02-23-2018, 07:03 AM - Forum: Knowledge & Technique
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The crack in the hull of an aluminum high-speed catamaran last December in Hawaii triggered an investigation by the vessel's builder, its owner and the U.S. Coast Guard to determine the cause. Similar problems soon became apparent in other vessels recently built on the U.S. West Coast. The unexpected consensus: Some aluminum plates made of 5083-H321 composition used for recent vessel construction were found not to be resistant to corrosion in a saltwater environment.
In the past, builders of aluminum vessels had successfully used both 5083-H321 and 5083-H116. Although the two grades of aluminum differ somewhat in their physical characteristics, both have been generally referred to as marine grade and used in saltwater environments.
After December's discovery, the shipyards moved quickly to fix all damage, including replacement of undamaged but nevertheless noncorrosion-resistant aluminum as determined by testing.
Nichols Bros. Boat Builders' initial response was typical. A boat it had built for service in Southern California was found to have cracks in the middle of 3/16-inch-thick aluminum plates mainly in the engine room and water jet pump room.
"We brought the boat back into our yard and ran a double shift," said Matt Nichols, president of Nichols Bros. "We had to lift the deckhouse off, and replaced with all new material some longitudinal stringers, plates and anything attached." The work, he said was "taken care of by us at great expense, but the customer is extremely pleased."
At Kvichak Marine Industries, the response was equally fast to resolve the problems when the first reports came of defoliation and cracking of the aluminum hull on the Hawaii catamaran.
The Coast Guard's Puget Sound Marine Safety Office identified Nichols Bros., Kvichak Marine and Norsco Marine as the shipyards affected, and Reynolds Metals Company, Alcan Aluminum Corp. and Integris Metals as suppliers of the material.
The extent of the problem is still unknown. In a lawsuit, Nichols Bros. contended "the problem could affect at least 25 vessels built by several shipyards and their total value could exceed $50 million."
Apparently, the shipyards relied on the commonly used product terminology of "marine-grade aluminum" when purchasing materials for these vessels. But this time, Matt Nichols said, "the 5083-H321 was not corrosion-resistant like it was supposed to be. Once salt water got on the material, it started a process of breaking the material down and defoliation would begin."
In early February, Integris Metals stated in a letter that the 5083-H321 it supplied was not guaranteed for marine use and could be susceptible to corrosion when exposed to salt water. On March 11, the issue moved to court when Nichols Bros. filed a lawsuit in U.S. District Court against both Reynolds and Alcan to recover damages. The complaint alleged that "Reynolds knew the aluminum Nichols sought was intended for use on a passenger ferry to be used in a marine environment, and that the aluminum would have to be marine grade." Although the aluminum suppliers had "delivered certificates of conformance ... that the aluminum had the characteristics that made it marine grade, the material delivered in fact was not marine-grade." Further, the complaint contended that because of Reynolds' "skill and experience" in supplying aluminum, "Nichols left up to Reynolds the choice of aluminum between 5083-H116 and 5083-H321 to supply for use."
5083-H321 has been successfully used for other vessel construction. One Far Eastern shipyard said that while that material "does not require painting for corrosion protection, it may be advisable to fill and fair hull exteriors and superstructure above the waterline with an epoxy micro-balloon filler."
In this current problem, Matt Nichols said the low corrosion resistance of the 5083-H321 supplied may be related to a production factor.
"Basically, the Alcan plant in Oswego, N.Y., that was doing the manufacturing changed the procedure from a hot-rolled process to a cold-rolled process," he said. "In hot rolling, the particles of the components of the material were distributed much better, in a more fluid and more uniform manner. The cold-rolled process just wasn't as uniform. Once salt water got on the material, corrosion, defoliation and cracking would begin."
Another factor may be the degree of magnesium particles between grain boundaries in the aluminum microstructure. An independent metallurgist also advised the Coast Guard that factors such as vibration, operational heat from engines, high ambient temperatures and vessel stresses could accelerate the development of cracks.
But in selecting an appropriate aluminum material for corrosive atmospheres, one aluminum supplier that is not involved in the dispute recommends 5083-H116 because "this temper (H116) has characteristics which substantially eliminate the susceptibility of alloy 5083 to exfoliate under certain corrosion conditions."
Ultimately, defining different tempers of 5083 aluminum and their production methods for use as "marine grade" may have to be clarified. Lt. Cmdr. Tom Miller, chief of inspections with the Coast Guard's Puget Sound Marine Safety Office, noted that while both 5083-H116 and 5083-H321 currently are used for vessel construction, "It could be argued there is a marine-grade standard, but it is not explicitly defined. That may need to happen."
Attempts to resolve the issue out of court by negotiations are underway.
A team from Alcoa Inc., Alcan and Integris Metals is "currently gathering information and communicating directly with boat builders and the Coast Guard," according to the companies.
A meeting at Nichols Bros. with the aluminum suppliers in late March was "very positive, very upbeat," Nichols said. The Alcan-Reynolds-Integris project team also met with the Coast Guard in early April.
For the shipyards, attempting to recover the costs for the vessel repairs from the aluminum suppliers is one part of their problem. Another is scheduling vessel repairs with suitable aluminum into the sequence of other jobs underway in the yards.
"The shipyards will work through this with their customers," said one industry source. Matt Nichols was also positive: "Those material problems are just something that will not happen again."
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| 5083 aluminium alloy Plate |
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Posted by: aluhm - 02-23-2018, 06:49 AM - Forum: Knowledge & Technique
- Replies (6)
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5083 aluminium alloy Plate belong to Al-Mg-Si alloy, the use of a wide range of. The application of 5083 aluminum plate belongs to the high-end field of aluminum processing industry. With the rapid development of domestic rail transit market and the arrival of the era of globalization, it has a huge market prospect. According to the market development of 5083 aluminum sheet and the demand of the light weight, the production of aluminum alloy sheet was increased, and the production process of aluminum alloy sheet was strictly controlled by 5083 aluminum alloy sheet. Sure, the alloy casting process optimization, homogenization heat treatment and rolling, the 5083 aluminum sheet Haomei with aluminum performance with foreign materials, to meet user requirements, especially to meet the increasing demand of aluminum processing, rail transportation, high-grade car complex parts such as marine, very broad prospects for application.
![[Image: 5083-H116-5mm-aluminum-plate.jpg]](http://thick-aluminum-plate.com/images/pic/5083-H116-5mm-aluminum-plate.jpg)
Performance advantage:
1, 5083 aluminum sheet has low density, high strength, marine aluminum sheet, lightweight aluminum for automotive, aerospace aluminum, aluminum tank for special;
2, 5083 aluminum sheet has corrosion resistant, durable, economic and environmental protection;
3, 5083 aluminum sheet has the arc welding performance is good, the surface is beautiful after anodizing;
4, China approval certificate and Norway Veritas certification for Haomei quality escort ship;
5, 5083 aluminum sheet has no oil, no aluminum surface waves, no scratches, no roller, uniform cutting edges and burr;
The company Haomei Industrial Co., Ltd. China's largest Aluminum Plate manufacturers and suppliers, the production of 1-8 series aluminum alloy plates to provide you with the best price and high quality services
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| Why do people put aluminum foil on windows? |
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Posted by: aluhm - 02-23-2018, 06:05 AM - Forum: aluminium faq
- Replies (1)
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Mostly, it blocks out the light. It also blocks infrared radiation, so it keeps sunlight from heating the inside. And it blocks radio waves, so it makes it harder for your cellphone to get a signal, as well as makes it harder for your neighbors to hijack your WiFi.
But mostly it's to block out light, for people who are willing to be penny wise and pound foolish.
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