1060 brushed aluminum plate welding

1060 brushed aluminum plate can be used after welding in actual use, but many people are not very familiar with the welding procedure. The following is a brief introduction.
 
 
 
1. Preparation before welding: Chemical or mechanical methods are used to strictly clean the surface oxide film on both sides of the weld bevel. Chemical cleaning is the use of alkali or acid to clean the surface of the workpiece.
 
The method can remove the oxide film and remove the oil. The specific process is as follows: a sodium hydroxide solution having a volume fraction of 6% to 10%,
 
Soaking at 70 ° C for 0.5 min → washing → volume fraction of 15% nitric acid soaked at room temperature for 1 min for neutralization treatment → water washing → warm water washing → drying.
 
The surface of the washed aluminum alloy is a matt silver white. Immediately after cleaning, apply welding. If it is placed for more than 4 hours, it should be cleaned again.
 
 
 
 
Second, determine the assembly gap and the positioning welding interval. During the welding process, the 1060 aluminum plate is heated and expanded, resulting in a reduction in the gap of the weld bevel. If the welding clearance before welding is too small,
 
During the welding process, the groove of the two plates overlaps, increasing the unevenness and deformation of the plate surface after welding; on the contrary, if the assembly gap is too large, the welding is difficult and there is a possibility of burning.
 
A suitable tack welding pitch can ensure the required tack weld gap. Therefore, selecting an appropriate assembly gap and tack weld spacing is an effective measure to reduce deformation.
 
 
 
 
Third, the choice of welding equipment Currently on the market there are many types of welding products, under normal circumstances should use AC tungsten argon arc welding (ie TIG welding). It is under the protection of argon,
 
A welding method for melting a base material and a filler wire by using an electric arc generated by a tungsten electrode and a workpiece. When the welder is working,
 
Since the polarity of the alternating current is periodically changed, the half wave is DC positive connection and the half wave is DC reverse connection in each cycle.
 
During the half-wave period of the positive connection, the tungsten electrode can emit enough electrons without overheating, which is conducive to the stability of the arc.
 
The oxide film formed on the surface of the workpiece during the reverse half-wave is easily removed to obtain a bright and beautiful surface and a well-formed weld.
 
 
 
 
Fourth, the selection of welding wire is generally selected from 301 pure aluminum welding wire and 311 aluminum silicon welding wire. The welding method and parameters are generally selected by the left welding method, and the torch and the workpiece are at an angle of 60°.
 
When the welding thickness is 15 mm or more, it is performed by the right welding method, and the torch and the workpiece are at an angle of 90°. When the welding wall thickness is more than 3mm, the V-shaped groove is opened, and the angle is 60°~70°.
 
The gap must not exceed 1mm and is completed by multi-layer welding. When the wall thickness is less than 1.5 mm, the groove is not opened, no gap is left, and no filler wire is added. When welding a pipe butt joint,
 
When the pipe diameter is 200mm and the wall thickness is 6mm, a tungsten electrode with a diameter of 3~4mm should be used, with a welding current of 220~240A and a filler wire with a diameter of 4mm.