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鑄鐵焊接工藝

鑄鐵焊接工藝哪家好

焊接專用設備所用的鑄鐵焊接工藝有哪些：

（1）將工件斜放，使焊縫向上或半垂直焊接，以減小熔合比。（焊接前別忘了清理）

（2）焊接前對坡口周圍的坡口進行預熱，溫度爲200-250攝氏度，以減小焊縫與工件的溫差。

（3）电极铸造308，直径d3.2 mm和4 mm。焊接前，电极应在150℃下烘烤2小时。

（4）第一、二、三層焊道選用d3.2mm電極，電流90-100A，Z後兩層焊道選用d4mm電極，電流130-160A。采用直流正接。

（5）每層焊後清渣。

（6）焊接後，在焊接區域周圍200毫米範圍內，加熱至300-350攝氏度，保持30分鍾，用石棉粉覆蓋以減緩冷卻。

（7）焊接注意事项如下：（1）为减少坡口两侧的熔深，可采用快速不摆动焊接。在焊缝中部，可以轻微摆动，但摆动范围较小。（2）当工件较厚时，槽截面较大，采用多层多道焊。焊接断面大，收缩应力大，容易形成焊缝剥落。因此，采用合理的焊接顺序。（3）采用短节焊、断续焊、分散焊和逐步后退焊。短段焊接，即每段长度约为10-40 mm。间歇焊接，即在焊接一段时间后停留片刻，然后在工件冷却到50-60℃时焊接下一个焊缝，以防止热量集中。分散焊接时，一部分焊接后另一部分焊接，为了减少温差，减少应力。与连续焊相比，逐步后退焊可以大大降低焊缝的峰值拉应力，有利于防止焊缝出现裂纹。（4）锤焊。锤击焊缝时，温度应在400℃以上，用小圆头锤击焊缝，使焊缝金属伸长，使补焊区应力松弛。焊接第一层和Z后一层，不要锤击。

上一篇青島點焊機的原理介紹有哪些下一篇影響點焊機使用效率的幾大因素

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