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.
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