文档介绍：二保焊的正确焊接方法
C02 gas welding operation
arcs
keep dry elongation unchanged.
reverse arc starting method, arc starting a
preventive defects are given:
Anti - angle angle does not melt them thoroughly. No melting between layers - pay attention to gun angle.
Welding parameter
current and voltage
U2=14+0. 0512
Welding current should be selected according to the base metal thickness, the form of joint and the diameter of welding wire. Short circuit transition, in ensuring the penetration of the premise, as far as possible to select a small current, because when the current is too large, easy to cause the pool to roll, not only splash, forming is very poor.
Welding voltage must be in good condition with current. Welding voltage is too high or too low will cause spatter, welding voltage should be accompanied by welding current increase and improve, should be accompanied by welding current decrease and reduce, the best welding voltage is generally between 1-2V, so
Welding voltage should be carefully adjusted.
The current is too large: the arc length and spatter are large, and the feel of the top hand is too high. The fuse on both sides is not good.
High voltage: long arc, spatter is slightly big, current instability, residual height is too small, the weld width, arc burning tip.
dry stretch length
The length of the welding wire extending out of the conductive nozzle is the