Laser penetration spike welding. A welding tool enabling novel process and design opportunities

摘要

A novel method for laser welding for sheet metal is presented. This laser spike welding method is capable of bridging large gaps between sheet metal plates (gaps of more than 100% of the top plate thickness). Novel constructions can be designed and manufactured. Examples are light weight metal epoxy multi-layers and constructions having additional strength with respect to rigidity and impact resistance. Its capability to bridge large gaps allows higher dimensional tolerances of parts and positioning equipment. Furthermore higher yields can be obtained in view of the larger tolerances in production. The required laser systems are commercially available and are easily implemented in existing production lines. The lasers are highly reliable, the resulting spike welds are quickly realised and the cost price per weld is very low.