The welding quality of steel bars is related to the weldability of steel and the welding process. Solderability is related to the amount of carbon and the amount of alloying elements. If the amount of carbon and manganese is increased, the weldability is poor; and the proper amount of titanium improves the weldability. The welding process (welding parameters and operating level) also affects the quality of the weld. Even for steels with poor weldability, good welding quality can be obtained if the welding process is suitable. When the ambient temperature is lower than -5 °C, it is the low temperature welding of the steel bar. At this time, the welding process parameters should be adjusted to make the weld and heat affected zone slowly cool. When the wind exceeds 4, there should be wind protection measures. Welding shall not be carried out when the ambient temperature is below -20 °C. See http://://news.chinawj.com.cn for details.
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