The De-Gassing Evaluation with Full Penetration for Remote Laser Welding of Zinc Coated Sheet Metal

Abstract

There are the four types of defects during remote laser welding of zinc coated sheet metal. The root cause of all these defects is the explosion or ejection of molten weld metal caused by the escape of trapped high pressurized zinc vapor. Zinc removal is one of the methods used to solve the defects. We have researched the full penetration zinc removal method for remote laser welding with coupons of zinc coated sheet metal. The result shows that the full penetration zinc removal method works at the cost of high heat input and low welding speed