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Aluminum plate welding construction technical scheme

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  • Time of issue:2020-03-02 16:29
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(Summary description)To weld aluminum, the welder must carefully clean the base metal and use oil or solvent to remove any oxide and hydrocarbon contamination on the surface of the aluminum.

Aluminum plate welding construction technical scheme

(Summary description)To weld aluminum, the welder must carefully clean the base metal and use oil or solvent to remove any oxide and hydrocarbon contamination on the surface of the aluminum.

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2020-03-02 16:29
  • Views:
Information
1. Preparation of base material:
 
To weld aluminum, the welder must carefully clean the base metal and use oil or solvent to remove any oxide and hydrocarbon contamination on the surface of the aluminum. The melting temperature of oxides on the aluminum surface is 3700 degrees Fahrenheit. Therefore, any oxide remaining on the surface of the aluminum base material will restrict the penetration of the filler metal into the work piece.
 
The oxide on the surface of aluminum can be stainless steel wire wool or solvent corrosion method. When using a stainless steel brush, you can only brush in a fixed direction. Be careful not to use too much force and carelessness: the action of rent storm will cause the oxide to be embedded in the aluminum base material. At the same time, only use stainless steel on the aluminum surface, do not use the brush used on stainless steel or carbon steel.
 
2. Chemical cleaning
 
Chemical cleaning has high efficiency and stable quality, and is suitable for cleaning welding wire and small-sized, batch-produced workpieces. Available dip method and scrub method. It can be degreased with organic solvents such as Bingyoshino, gasoline, kerosene, rinse with flowing water, air-drying or low-temperature drying. Mechanical cleaning is often used when the workpiece is large in size, has a long production cycle, and is contaminated after multi-layer welding or chemical cleaning. First rub the test bacteria with organic solvents such as vinegar, gasoline, etc. to remove oil, and then directly use a steel wire or stainless steel wire brush with a diameter of 0.15mm and 0.2mm until the metal luster is exposed. It is generally not suitable to grind with abrasive wheels or ordinary sandpaper to avoid defects such as slag inclusion when left on the metal surface and entering the molten pool during welding. In addition, the surface to be welded can be cleaned by scraper, trowel, etc.
 
After the workpiece and the welding wire are washed and cleaned, the oxide film will be regenerated during the storage process, especially in a humid environment, and in an environment polluted by acid, alkali and other vapors, the oxide film grows faster. Therefore, the storage time of the workpiece and welding wire after cleaning and cleaning to welding should be shortened as much as possible. In the case of humid climate, welding should generally be performed within 4 hours after cleaning. After cleaning, if the storage time is too long, if it is more than 24, it should be handled again.
 
Preheating: Preheating aluminum machined parts can help avoid welding cracks. The preheating temperature should not exceed 230 degrees Fahrenheit. Use a grip meter to monitor grip to prevent overheating. In addition, placing upset welding at the beginning and end of the welding area can help to enhance the preheating effect. Welders should also preheat a thick piece of aluminum when welding thin materials.
 
3. Processing speed
 
The process of welding aluminum requires high temperature and high temperature. Unlike steel, the higher thermal conductivity of aluminum requires higher current and voltage settings and higher welding speed. If the welding speed is too slow, There will be excessive welding penetration, especially when welding thin materials.
 
Shielding gas: Due to its excellent cleaning performance, oxygen is used as the most commonly used shielding gas for aluminum welding. When welding 5XXX-series aluminum alloys, the shielding gas used is a mixture of oxygen and nitrogen. A maximum of 75% nitrogen is used to achieve the best effect of reducing the effects of ballast oxides. Fused-electrode gas shielded arc welding and swept-down gas-shielded arc welding are widely used.
 
4. Welding materials
 
(1) Welding wire
 
In addition to considering the good welding process performance, according to the requirements of the container, the tensile strength and plasticity of the butt joints {pass the bending test} should meet the specified requirements. To meet the requirements of impact toughness, the corrosion resistance of welded joints for containers with corrosion requirements should also reach or approach the level of the base metal. Therefore, the selection of welding wire is mainly based on the following principles:
 
1) The purity of pure aluminum welding wire is generally not lower than the base material;
 
2) The chemical composition of aluminum alloy welding wire is generally corresponding to or similar to the base material:
 
3) ifb etch elements in aluminum alloy welding wire {mirror, mirror, silicon cut content is generally not lower than the base material}
 
4) When welding dissimilar aluminum materials, the welding wire should be selected according to the base material with high erosion and high strength;
 
5) High-strength aluminum alloys that do not require corrosion resistance {heat-treated strengthened aluminum alloys} can be used with different composition welding wires, such as aluminum-silicon alloy welding wires with good crack resistance. {Note that the strength may be lower than the base metal}.
 
Spool or longitudinal cut M / G aluminum and aluminum alloy welding process. In order to achieve the best welding effect, the following welding wire is recommended to match the base material: ER1100 is a filler metal containing 99% aluminum, which can be used in construction, decoration and Equipment, metallurgy, pipes, spinning appliances and other industries. It is generally applied to 1100, 3003 or base materials similar to 3003, and 1060, 1070, 1080, 1350. The wire was slightly golden yellow after anodizing. ER4043 is usually used as ALSi gas. It is an aluminum-filled metal containing 5% silicon. It can be recommended for welding 3003, 3004, 5052, 6061, 6063 and casting metals 355, 356 and 214. After anodizing, the color is off-white, and the minimum tensile strength is 186 Mp. ER4047 is a 12% silicon-containing aluminum filler metal. This alloy can also be supplied as a general-purpose aluminum welding alloy with good corrosion resistance. It is a more popular alloy welding wire for brazing or aluminum welding. It can be used for welding of base materials 1060, 3500, 3003, 3004, 3005, 5005, 5050, 6053, 6061, 6951, 7005 and casting alloys 710.0 and 711.0. ER4047 has a melting point of about 1070 to 1080, and its color is grayish black after anodizing. ER5183 is generally used as ALMg4.5Mn alloy filler metal, which can be used for welding of MIG or TlG of bobbins or longitudinal cuts. This alloy is generally used in welding processing of ships, drilling equipment, trains, automobiles, storage tanks and pressure vessels, etc. The base metal includes 5083, 5086, 5456, 5052, 5652, and 50560 ER5183. The color after anodizing is white, the melting point is 1070-1180F, and the tensile strength of the weld is 294 MPo. ER5356 is usually used as ALMg5. It is a 5% aluminum alloy filler metal. It can be processed by MIG or TIG. It has good resistance to seawater corrosion. It can be used for welding of base materials 5050, 5052, 5356, 5454 and 5458. . It is white after anodizing and has a tensile strength of 290 MPo
 
5. Post-weld processing
 
Residual flux and slag remaining in the weld and its vicinity after welding can damage the passivation film on the aluminum surface, and sometimes corrode the aluminum parts, and should be cleaned. Simple shapes and common workpieces can be cleaned by simple methods such as hot water flushing or steam blowing. The aluminum parts with high requirements and complicated shapes can be washed with hot-bristled brush in hot water, washed with hot water, dried in an oven, or blown with hot air, or dried naturally.

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