A high-power fiber laser can produce an ultra-high peak power density of MW/mm
2 level corresponding to a focused electron beam owing to its high beam quality, and is promising as one of the desirable heat sources for high-speed and deep-penetration welding. A 1.5 MW/mm
2-tightly-focused 10kW fiber beam could produce fully penetrated welds in 8mm-thick Type 304 stainless steel plates at the welding speeds of less than 10m/min. Moreover, the high-speed video camera observation and the X-ray transmission real-time observation of the welding phenomena show that a sound weld bead was formed owing to the formation of a long molten pool suppressing and accommodating spattering and a stable keyhole without bubbles generated from the tip. These features of the high-power fiber laser welding are expected to lead to a further increase of industrial applications of fiber lasers.
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