What is the weldability of Q420C steel?

Weldability of Q420C steel plate

One is the sensitivity of 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 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.

In the past, the steel used in the welding structure was mainly Q420C steel low-carbon steel. The quality of the weld is very important. As long as there is no problem, there will be no problem in the welding heat affected zone. However, with the use of low-alloy high-strength steel, the quality of welding is not only determined by the weld, but also by the heat-affected zone in the southern zone of the welding heat shadow, which is more complicated than the weld.