CARBON DIOXIDE LASER WELDING METHOD FOR METALLIC MATERIAL AND WELDING AND JOINING MATERIAL

摘要

PURPOSE:To efficiently obtain a CO2 laser weld zone having decreased blowhole (porosity) defects without requiring intricate welding parameter management even with metallic materials with which the blowhole (porosity) defects are liable to arise. CONSTITUTION:The plural metallic materials are subjected to CO2 laser welding by controlling the irradiation angle of a CO2 laser to an advance angle 10 to 60 deg. or retreat angle 20 to 60 deg. with the welding direction in the method for welding and joining the plural metallic materials by the CO2 laser. The CO2 laser welding is executed by controlling the irradiation angle of the CO2 laser to the advance angle 10 to 60 deg. or retreat angle 20 to 60 deg. with the welding direction in at least the final pass in the case of executing of the welding by superposing the joint parts of the metallic materials with >=2 passes by the CO2 laser. A good effect is obtd. when this method is applied to welding of aluminum or aluminum alloys (sheets, extrudates, etc.) in particular in addition to steel materials.