Advice on non critical welding mild steel to blade.

B

barry burnett

Joined
Jul 25, 2018
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13
Hi guys,
I need to add 10mm to a blade I made .
The joint will not be under much stress due to the way the blade will be used in the machine.
I only need to increase the depth of the blade in order for it to fit correctly in a specific part of the machine.
The mild steel will be added to the spine of the blade and only needs to be tacked.
The blade is 40mm deep so not too much buffer between the area to be welded and the actual cutting edge.
Would it be better to weld before or after HT ?
Blade is 3mm thick.
thnx
 
If you made the blade, why not start over and remake the blade the correct length?

I would not advise welding it.
That said, if you do weld it, do more than a tack weld, and weld it before the HT.
After welding and grinding, anneal the thing, then do your heat treat.
 
afishhunter said:
If you made the blade, why not start over and remake the blade the correct length?

I would not advise welding it.
That said, if you do weld it, do more than a tack weld, and weld it before the HT.
After welding and grinding, anneal the thing, then do your heat treat.
Click to expand...

Hi thnx for the replies.
I know this may sound silly to you seasoned pros, but this project may or may not work as expected and this is the only piece of steel I have..Once I see the machine will work as expected I will have a more precisely fitted blade. Also, this specific size issue will not determine whether the machine works or not (in my estimation)
Can you guys tell me the main downside of welding after HT.?
thnx
 
barry burnett said:
Hi thnx for the replies.
I know this may sound silly to you seasoned pros, but this project may or may not work as expected and this is the only piece of steel I have..Once I see the machine will work as expected I will have a more precisely fitted blade. Also, this specific size issue will not determine whether the machine works or not (in my estimation)
Can you guys tell me the main downside of welding after HT.?
thnx
Click to expand...
The main downside to welding after HT is getting the steel hot enough to ruin the temper of the cutting edge. If you are just going to tack it, it shouldn't get that hot, but tack welds may or may not be strong enough, depending on the application.
 
me2 said:
What kind of blade steel? What kind of welding process?
Click to expand...
Sandvik 14c steel.
Was going to clamp the blade between alu or copper plates.
One single 1 second tack on either side should be enough just to hold it.
Maybe I can even use a strong epoxy as due to the application, the pressure placed on the joint will actually be compressing it against itself so it wouldnt need to be that much penetration at all.
I would use mig or stick to tack it.
 
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