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The authors have developed a new chamber for laser welding under the low vacuum conditions achieved by using rotary pumps. High-power disk laser bead-on-plate welding was performed on Type 304 stainless steel or A5052 aluminium alloy plate at the powers of 10, 16 and 26kW at various welding speeds under low vacuum. The sound welds of more than 50 and 70mm in penetration depth could be produced in...