Tig-welding and THEN heat-treating O1 / A2

- R
- rashid111
  
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posted
17 years ago

Fri, Dec 15, 2006 1:15 AM

Was wondering if you could run into issues ? The goal is the create die with perfectly sharp corners and straight sides, by TIG welding "strips" of O1 or A2 and then resizing and heat-treating resulting dies.

The die shapes would vary from rectangular .25 wide x 1.6 long to slightly trapezoidal .040 wide by .280 long.

I can not figure out another way to get this done in a reasonable amt of time. Making dies by milling and then fiiling would take more time than I have :), let alone the fun of milling .040 slot in .250 thick O1 or A2.

What filler should I use ? I reckon with A2, being air-hardened, I would not run the risk of uneven shrinkage/cracking ?

- N
- Ned Simmons
  
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posted
17 years ago

Fri, Dec 15, 2006 2:51 AM

Sounds like clicker dies or steel rule dies, both of which are made by bending and welding strips of tool steel to shape. Both are inexpensive to have made to order. What are you cutting?

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Ned Simmons

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- Robin S.
  
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posted
17 years ago

Fri, Dec 15, 2006 7:45 AM

We use a filler called "G2" for full-hardness applications like trim edges. You have to beat the weld *immediately* after you've laid it in order to stress relieve it, or it will likely crack.

This filler cannot be heat treated after it is applied. Also, whatever the weld is on cannot be fully hardened, only flame hardened.

I'm not too sure about tig welding tool steels together though. I'd imagine you'll end up with the area around the weld being very hard, and they areas away from the weld still being soft. O1 would be more likely to crack during subsequent heat treatment because of the more rapid cooling. I'd start with an air hardening steel like A2.

It'll probably work unless you want a hundred thousand hits out of the die... Best thing to do is... Try! :)

Regards,

Robin