2026-07-21
Although defects such as weld nugget deviation and cold welds/incomplete fusion cannot be completely eliminated, their occurrence can be reduced to an extremely low level through systematic process control, real-time quality monitoring, and regular equipment maintenance. The following solutions focus on two critical defect areas — weld nugget deviation and cold welding/incomplete fusion — combining proven process optimization methods with advanced intelligent welding technologies. 1. Precise Control of Weld Nugget Deviation Weld nugget deviation is mainly caused by arc blow (magnetic arc deflection) and uneven heat dissipation conditions. 1.1 Eliminating Arc Blow — Prevention at the Source Symmetrical grounding (core measure) The ground connections should be positioned symmetrically on both sides of the welding location. This prevents uneven electromagnetic fields from deflecting the arc and is the most effective method for eliminating arc blow. Remove or ground nearby metal masses If large metal components, reinforcement plates, or conductive structures are located close to one side of the weld area, they should be removed or properly grounded to avoid magnetic field interference. Rotate the welding torch For manual stud welding, if arc deflection occurs toward one direction, rotating the torch handle by 90° can change the magnetic field distribution and improve arc stability. Control lift height Excessive lift height or missing ceramic ferrules can increase arc instability. Recommended lift height: General range: 1.0–1.6 mm Always use ceramic ferrules whenever possible to stabilize the arc. Figure: Symmetrical Grounding Configuration for Arc Blow Prevention Proper grounding layout plays a critical role in stabilizing the welding arc. Symmetrical grounding reduces magnetic field imbalance and prevents arc deflection, helping maintain consistent weld nugget positioning. 1.2 Optimizing Heat Distribution for Different Materials and Thicknesses Apply high-energy welding parameters Using a high current and short welding time (strong welding schedule) increases current density and reduces the influence…
