针对1J79软磁合金0.3 mm厚薄板脉冲激光焊接的焊缝形成规律和机理，设计了不同激光功率、脉冲宽度、焊接速度工艺参数的对照试验。结果表明，薄板脉冲激光焊接焊缝由一串等间距的焊斑重叠形成，呈典型的重熔特征，焊缝横截面存在多次熔化形成的熔合线。激光功率、脉冲宽度决定焊缝的熔透状态，对焊缝正面和反面成形影响较大，对焊斑重叠率影响很小。焊接速度决定焊斑重叠率，从而影响焊缝连续性和焊缝表面质量。在全熔透焊接条件下，焊斑重叠率大于62%时，可获得成形良好、表面均匀的薄板脉冲激光焊接焊缝。

Aiming at the weld seam formation rules and mechanism of 1J79 soft magnetic alloy 0.3 mm thick thin sheet pulsed laser welding, the control experiments of different laser power, pulse width and welding speed are designed. The results show that the thin sheet pulsed laser welding weld is formed by a series of equally spaced weld spots, which is a typical remelting feature. The weld cross section has a fusion line formed by multiple melting. The laser power and pulse width determine the penetration state of the weld, which has a great influence on the front and back surface of the weld and has little effect on the overlap rate of weld spots. The welding speed determines the weld spot overlap rate, which affects weld continuity and weld surface quality. Under the condition of full penetration welding, when the weld spot overlap ratio is more than 62%, a thin sheet pulsed laser welding weld with good shape and uniform surface can be obtained.