The large welding current caused the formation of quenched martensite and the high residual stresses in the welding zone, resulting in the increase of zinc sensitivity of hydrogen attack.
结果表明：由于焊接电流过大，使焊缝产生淬火马氏体组织及较大的焊接残余应力，导致镀锌氢脆敏感性增加，造成吸油盘发生氢脆开裂。
The results indicate that with the increase of the welding current, welding press and electrifying time, there are decreased in rate of false welding and increased in pressed depth.
结果表明：当焊接电流越强，电极压力越大，焊接通电时间越长时，钢筋网焊点虚焊率越低，压入深度越大。
Welding current can be set to increase compensation.
可设定焊接电流递增补偿。
This welding machine has features of simple operation, high efficient production and stepless adjustment for current increase time, current value, current maintaining time and pressure time.
操作方便，生产效率高，具有电流上升时间、电流大小、电流持续时间及加压时间、脉冲频率等参数的无级调节。
High speed dual inverter to control the current wave form, very high arc stableability, high quality AC square wave, decrease the welding cost and increase the weld quality.
双重逆变高速控制电流波形，电弧稳定性极高，高品质矩形交流波，降低焊接成本，提高焊缝质量。
High speed dual inverter to control the current wave form, very high arc stableability, high quality AC square wave, decrease the welding cost and increase the weld quality.
双重逆变高速控制电流波形，电弧稳定性极高，高品质矩形交流波，降低焊接成本，提高焊缝质量。
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