1. Phenomenon The surface depression is formed during the welding arc, and is often accompanied by defects such as shrinkage holes and cracks.
The arc is closed when the weld pool is not full in the welding receiving arc
Welders underestimate arcing
The arc stop time is inaccurate.
3. Prevention measures
⑴Extend the arc closing time.
⑵ Take correct arc closing method.
4. Governance measures
⑴Strengthen the operation skills of welders
Master various arc closing, arc stopping and welding operation methods of joints
⑵Strengthen welder responsibility
(3) Grinding and repair welding of arc craters that have been formed.