(1) copper welding the most commonly used is the butt joint, lap joints and T-shaped joints as little as possible. Gas welding can be used two kinds of welding wire, one is the deoxidizing element of the wire, such as silk 201,202; the other is the general copper and the base material of the cut, using the agent 301 as flux. Gas welding of copper should be used neutral flame.
(2) copper electrode welding arc welding. Weld thickness greater than 4 mm, the welding must be preheated, preheating temperature is generally 400 ~ 500 ℃. Welding with copper 107 electrode, the power supply should be DC reverse connection. Welding should be used short arc, the electrode should not be used for lateral swing. The electrode is reciprocating linear motion, which can improve the shape of the weld. Long weld should be used step by step. Welding speed should be as fast as possible. In the case of multi-layer welding, the slag between the layers must be completely removed. Welding should be carried out in a well ventilated place to prevent copper poisoning. After welding, apply the flat hammer to hit the weld, eliminate the stress and improve the weld quality.
(3) copper manual welding. In the copper manual welding, the wire used wire 201 (special copper wire) and wire 202, also used copper wire, such as T2. Welding should be the edge of the workpiece welding and welding wire surface oxide film, oil and other dirt must be clean, to avoid the pores, slag and other defects. The methods of cleaning are mechanical cleaning and chemical cleaning.
When the board thickness is less than 3 mm, the groove is not open; the thickness is 3 ~ 10 mm, the V-shaped groove is opened, the groove angle is 60º ~ 70º; when the plate thickness is more than 10mm, Groove angle of 60 º ~ 70 º; in order to avoid not penetration, generally do not keep blunt edges. According to the thickness and groove size, butt joint assembly gap in the range of 0.5 to 1.5 mm selected.