Weldability of Q420C steel plateThe first is the sensitivity of Q420C metal welding to defects;
The second is the reliability of welded joints under certain conditions of use.
Therefore, good weldability should be simple welding process, not easy to produce cracks and various defects during welding, and maintain sufficient strength and toughness at the weld.
In the
Q420C steel plate welding process, the metal in the welding cone and heat-affected zone undergoes a series of complex processes such as heating, melting, crystallization, cooling, state phase change, stress and strain.
These processes all occur in a small area that is close to dryness, and their temperature distribution and chemical composition are in a special state of extremely unbalanced.
However, with the use of
low-alloy high-strength steel, this situation has changed. The quality of welding is not only determined by the weld, but also by the problems in the heat affected zone in the southern heat shadow of welding, which is more complicated than the weld.
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