4130 post heat treating welding

[bajamatt]

In the process of making some new uprights. They are made from 4130 plate. We are planning on having them heated treated, but I was told that once they are heated treated you can no longer weld to them. Thoughts? I'm new to this whole heating treating process. I've read a lot of the other threads, but most of them deal with pre-heat treat processes. Thanks in advance!

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[gawdodirt]

You can have them annealed AFTER heat treating to weld additional pieces to them. Consult a metallurgy engineering specialist.

[atomicjoe23]

You can weld on them after they are heat treated. . .the only problem is that you will change the heat treat in the HAZ, so it is best to weld them up prior to heat-treating otherwise you're gonna be heat treating them twice or defeating the whole point of heat treating in the first place.

[gawdodirt]

Depending on the degree of treatment; how hard. It can also crack or fracture in the area if you weld a heat treated part. The Most likely scenario is a crack you can't see. Most effective would be to just stress relieve the parts, or cryogenically treated.

GD

[CRAIG_HALL]

Weld them up, stress relieve & heat treat. Now it will have uniform strength throughout. If a repair is needed, just weld it up then stress relieve & ht again. If you don't, you will have created a weaker spot where the weld area is. Not a huge issue as many people don't HT in the first place.

[bajamatt]

Thanks for all the input. We are planning on welding everything up before heat treating. I was just thinking long term if we ever had to weld on them in the future (crack repair, steering changes, etc). But it sound like it's not too big of a deal.

Now for a stupid question - what is the process for stress-relieving? Do they usually do this as a process of the heat treating?

Thanks again

[gawdodirt]

Weld them up, stress relieve & heat treat. Now it will have uniform strength throughout. If a repair is needed, just weld it up then stress relieve & ht again. If you don't, you will have created a weaker spot where the weld area is. Not a huge issue as many people don't HT in the first place.

I was told by a heat treatment company that it has to be annealed before re-welding.
Stress relieving can be heat or vibratory.
GD

[Dirtracer 619]

can some one explain in plain english what I think (and could be wrong) is weld it run a torch oover it then what beat on it with a hammer or somthing??

talking about 2" 120 wall cromo

[atomicjoe23]

Not sure what you mean there. . .are you suggesting welding and then mechanically stress relieving the part with a hammer with regards to a structural part?

. . .or are you talking about when sheetmetal guys will anneal and hammer a weld for bodywork type of work?

[Dirtracer 619]

Just don't exactly know the best way to weld.cromo tubing. Need step one two three
What is meant by releiving