If the wire stick-out is too long, the wire will overheat and melt in sections, resulting in an unstable welding process, increased spatter, poor weld bead formation, and reduced gas protection of the molten pool. In the case of continuous arc welding with gas shielding during the root pass,

Elevator drum cutting and welding in the underground and two, the drum of the split method of winding hoist drum shell, subject to pulsating cyclic load, the fatigue strength requirements are high. Over the years, the reel in operation often occurs cracking and short cracks