DEEP PENETRATION WELDING WITH HIGH POWER DISK LASERS IN LOW VACUUM

摘要

High-power and high-brightness lasers such as diskrnand fiber lasers are recently developed to producerndeep penetration welds. This study was thereforernperformed to produce deep-penetration weld beads byrnusing high power disk lasers of 10 kW and 16 kWrnrespectively or combined lasers, and a newlyrndeveloped vacuum chamber with rotary pumps. It wasrnconsequently revealed that deeply-penetrated soundrnweld beads of 50 and 70 mm depth could be producedrnin Type 304 stainless steel under the conditions of 16rnand 26 kW, 0.3 m/min and 0.1 kPa, respectively.rnMoreover, sound full-penetration weld beads withoutrnhot cracks and underfills could be made in HT980rnhigh tensile strength steel plate of 23 mm in thickness.