脉冲参数对超薄板脉冲微束等离子弧焊焊缝成形及焊接热输入的影响

Effect of Pulse Parameters on Bead Formations and Welding Heat Input of Ultra-thin Sheet by Pulsed Micro Plasma Arc Welding

通过实验和数值模拟方法研究基/峰值电流、脉冲频率和占空比对不锈钢超薄板脉冲微束等离子弧焊缝成形及焊接热输入的影响。结果显示,不同超薄板脉冲微束等离子弧焊脉冲参数下共会得到5种焊缝成形,分别为焊缝不连续型、焊缝连续但宽度不一致型、熔池重熔型、鱼鳞纹型和光滑连续型。通过减小基/峰值电流差值、增大占空比及增大脉冲频率,可以使得焊接热循环动态变化趋于平稳均匀,从而获得光滑连续的焊缝。

The influence of base/peak current, pulse frequency and duty ratio on bead formations and welding heat input of ultra-thin stainless steel by pulsed micro plasma arc welding was studied by experiments and numerical simulation. The results show that five kinds of bead formations are obtained under different pulse parameters of pulsed micro plasma arc welding, which are discontinuous type, continuous bead with uneven width type, weld pool remelting type, scale pattern type and smooth and continuous type. The dynamic change of welding thermal cycle trends to be stable and uniform, and smooth and continuous type beads can be acquired by decreasing the difference values between base current and peak current,increasing duty ratios and raising pulse frequency.