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Why Hardness dropped after welding repair

Why Hardness dropped after welding repair

Why Hardness dropped after welding repair

(OP)
Hello Experts

we welded 4130 to 4130 material with suitable WPS with PWHT .
after welding, hardness in base metal was OK but we found crack on toe weld ,after repair and PWHT with same WPS that we used before for fabrication ,Hardness dropped on base metal ,

would you please tell what elements can make this problem ,or what is possibilities that can make this problem for us?

Thanks

RE: Why Hardness dropped after welding repair

Continued time at PWHT/tempering temperature will reduce hardness in the base metal.

RE: Why Hardness dropped after welding repair

(OP)
Thanks weldstan ,would you please give me guide line to learn little bit more about it?

RE: Why Hardness dropped after welding repair

You can Google search tempering effects on low alloy steel. As mentioned by weldstan, further tempering will result in lower hardness/strength in heat treated steels, like 4130.

RE: Why Hardness dropped after welding repair

(OP)
Thanks metengr

RE: Why Hardness dropped after welding repair

(OP)
any other specific sources for that?

RE: Why Hardness dropped after welding repair

Yes, ASM Metals Handbook, Volume 4, Heat Treating
Look under Tempering/Tempering Time to better understand the relationship between tempering temperature and time as process variables.

RE: Why Hardness dropped after welding repair

(OP)
Thank you so much Metengr

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