GB/T 700 Q235B low carbon steel has good weldability

GB/T 700 Q235B low carbon steel has low carbon content and good weldability, and Q235B steel usually need not take special technological measures to obtain high-quality welded joints.

As the carbon content of GB/T 700 Q235B low carbon steel is less than 0. 25%. Its resistivity is moderate, and the power of the required welding machine is not large. Besides, the plastic temperature range of Q235B low carbon steel is wide, which is easy to obtain the required plastic deformation without large electrode pressure. What’s more, the carbon and trace elements content of Q235B low carbon steel is low, and no high melting point oxide, generally do not produce quenching structure or inclusion. More over, the crystallization temperature range is narrow, the high temperature strength is low, and the thermal expansion coefficient is small, so the cracking tendency is small.

Therefore, GB/T 700 Q235B low carbon steel has good weldability, and the welding parameters such as welding current, electrode pressure and electrifying time have large adjustment range.