Welding alloy steel should not use solid solution strengthening
Alloy steel is a kind of steel containing a certain amount of alloying elements, commonly used alloy elements are Cr, Ni, Mo, W, V and so on.The welding alloy steel should not be used for solid solution strengthening, because:
1. Welding alloy steel is an alloy steel, weldability is poor, welding deformation relatively large, impact toughness and fatigue strength are relatively low, so you should use other methods to strengthen it.
2. Alloy steel with solid solution strengthening is easy to cause brittleness and reduce the toughness, so it is not suitable for welding alloys.
3. The strength of the weldment produced by solid solution hardening is not enough to meet the requirements of use.
In conclusion, solid solution strengthening is not suitable for welding alloys, and alloy steel welding should be strengthened in other ways, such as normalizing. The choice of welding method and optimization of parameters are particularly important. For example, when welding low alloy steel, sulfur and phosphorus should be as low as possible, and hydrogen content should be strictly controlled. Appropriate heat preservation measures should be taken in welding, preheating and postweld heat treatment should be carried out to reduce the thermal stress, ensure mechanical properties and ensure the quality of weldment. In addition, welding procedure qualification should be conducted for weldment with certain thickness to ensure the quality and service life.
