Because of the different kinds of alloy elements and the alloy content, the difference of welding performance between ASME SA572 Grade 50 low Alloy steel plates and alloy steel plates is remarkable. Under normal circumstances, the mass fraction of ASME SA572 Grade 50 low alloy steel plates carbon is below 0.4%, and the welding performance is still very good. And the alloy steel with yield strength higher than 400MPa has a mass fraction of 0.4%, which is very hardened and easy to generate cold cracks.
ASME SA572 Grade 50 low alloy steel plates welding technology:
1. In general, ASME SA572 Grade 50 low alloy steel plates preheating is needed before welding, and the preheating temperature is 100-150℃.
2. To control the cooling speed strictly. The welding current can be increased and the welding speed can be slowed down in order to slow cooling.
3. The low hydrogen welding rod with strong crack resistance should be used as far as possible.
4. Heat treatment after welding is used to prevent cold crack.
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