在进行碳钢及低合金钢的焊接时应进行预热。预热温度在焊接开始到结束期间应保持均衡。
Preheating shall be carried out for carbon and low alloy steel welding where required. Preheating temperature shall be kept uniform from the start to the end of welding.
异种钢焊接接头在焊接时或使用期间，发生失效的主要区域通常在熔合区。
The main region of invalidation of the weld joint between different steels is commonly in fusion zone during welding or serving.
预热温度在焊接开始到结束期间应保持均衡。
Preheating temperature shall be kept uniform from the start to the end of welding.
施加的压力电极提示，通过目前的流动，拥有部分焊在亲密接触之前，期间和之后的焊接电流的时间周期。
The pressure exerted by the electrode tips, through which the current flows, holds the parts to be welded in intimate contact before, during, and after the welding current time cycle.
焊接操作期间，除非间断焊和点焊，绝缘材料应从焊接处移开。
During welding operations, except for tack or spot welding, insulation material to be removed in way of the welding.
焊接操作期间，除非间断焊和点焊，绝缘材料应从焊接处移开。
During welding operations, except for tack or spot welding, insulation material to be removed in way of the welding.
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