What problems usually occur in the operation of automatic welding equipment

1. Weld slag inclusion during welding:
After backing welding, the root slag could not be completely overflowed during rapid hot welding. The method of backing welding and back gouging is improper, which causes the groove on both sides of the root pass to be too deep and W-shaped. During rapid hot welding, the slag flowing to the deep groove can not overflow in time to form slag inclusion. Slag inclusion is also easy to occur when the arc ends too fast at the overhead welding position.
2. Air holes generated during welding of automatic welding equipment:
During cover welding, the molten pool overheats and absorbs a large amount of surrounding air; During cover welding, the swing range of welding rod is too large, and the protection of weld pool is poor; If the root gap is too small, it is easy to produce needle bubbles at the root; The electrode is not used up within the specified time or exposed to the air for a long time.
3. Reasons for cracks in welds:
If the construction section fluctuates greatly and the earth pier is not placed in place in time, so that the pipe is in a stress state, and stress cracks are easy to appear at the welding end point, especially at 6 o'clock.
In the process of welding, if the aligning device is loosened or withdrawn early, the molten iron in the molten pool cannot be solidified well, and cracks are likely to occur at the end of the welding arc. The welder uses improper arc stopping methods such as direct arc extinguishing at the overhead welding position, resulting in crater cracks due to incomplete filling of the weld pool.
4. Causes of concave in automatic welding equipment during welding:
Insufficient penetration depth during backing welding; The welding current is too large, and the welding speed is too slow at 5-7 points during hot welding; The gap between the abutments is too large.