... low idle voltage arc-welding power supply低空载电压的弧焊电源 low temperature welding低温焊接 low-alloy steel covered arc welding electrode低合金钢焊条 ...
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The effective methods to avoid the cracking include lowering strictly the content of impurity and adopting low temperature welding process.
有效的改进措施是严格控制杂质含量、将高温焊接工艺改为低温焊接工艺。
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.
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。
However, if outdoor temperature is comparatively low, the records preheating aren't required for the welding operation preheating to room temperature.
但由于室外温度比较低，要求预热到室温后再进行焊接操作的焊前预热可不作记录。
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