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Welding procedure of aluminium alloy plate

  • Author:Dong Xing
  • Release on:2017-09-07
Alloy aluminum plate is need to be welded and other processes to use, just say welding process, I believe many people have heard of, but not understand very detailed, its specific steps, the following is a simple introduction.

Prepare, before welding. By chemical or mechanical method, oxide film on the surface of the welding seam. Harbin Dong Xing aluminum co., ltd could provide you with 6061 aluminum plate on sale.

The strict cleaning chemical cleaning is the use of alkali or acid cleaning of surfaces, the method can remove the oxide film, but also in addition to oil, the specific process is as follows: the volume fraction of 6%~10% sodium hydroxide solution, soaking at 70 degrees Celsius 0.5min, water washing, the volume fraction of 15% nitric acid at room temperature for 1min neutralization treatment, warm water washing, water washing and drying. Aluminum Alloy surface after washing the matt silver.

Immediately clean up after welding, if placed more than 4h, should be clean again. Harbin Dong Xing aluminum co., ltd is a competent and reliable Aluminum sheet manufacturer china.

Two, determine the assembly clearance and spacing positioning welding in welding, aluminum thermal expansion, resulting in the decrease of weld gap, before welding assembly clearance if the leave is too small, the welding process will cause two plate groove welding overlap, increase surface roughness and deformation; on the contrary, the assembly gap is too large, there is a welding difficulties, and burnt. The appropriate positioning welding spacing can ensure the positioning welding gap, required therefore, selective assembly clearance and positioning welding at appropriate intervals, is an effective measure to reduce the deformation. According to the experience of different thickness of seam more reasonable assembly processparameters such as table 2.

Three, the choice of welding equipment currently on the market there are many kinds of welding products, generally adopt AC TIG welding (TIG welding). It is under the protection of argon arc melting of the base metal Q generated by tungsten electrode and the workpiece and welding method of welding.

The welding work, the polarity of the AC current in cyclical change in each cycle of half wave DC, half wave DC reverse. It received during the half wave tungsten can emit enough electrons but not to overheat, conducive to the stability of the arc. The reverse surface of the workpiece during the half wave the film is easy to be cleaned up and get bright and beautiful surface, forming a good weld.

Four, select the wire generally used 301 pure aluminum wire and 311 Al Si wire. Selection of welding methods and welding parameters to the left of the general, the welding torch and workpiece at an angle of 60 degrees. The welding thickness above 15mm, with the right welding method, the welding torch and workpiece at an angle of 90 degrees. The welding thickness more than 3mm. Open the V groove, angle of 60 DEG ~70 DEG, clearance shall not be greater than 1mm, complete with multi-layer welding. The wall thickness below 1.5mm, without groove, leaving no space, without filler wire. Welding fixed pipe butt joint, when the diameter is 200mm, thickness is 6mm, the diameter of 3~4mm tungsten, the welding current is 220~240A, the diameter of filler wire 4mm, 1~2 layer after welding.

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