Welding to CPM steels

S

skillgannon

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Apr 27, 2009
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I have been a huge fan of CPM M4 for years. I have bought a piece and the length is not working out for the knives i want to build without a lot of waist. I know i have read that people will weld to Damascus for handles to save steel is it possible to do that with CPM steels as well? Or if not will brazing work post heat treatment?
 
For full tang knives, tig weld with 410 stainless filler rod. Use 410, 416, 420, aeb-l for the tang.

For narrow tang knives, mig weld.

Stress relieve by heating weld area to dull red with a torch. Anneal by heating to 1400f for 8 hours.

Heat treat like normal.

Hoss
 
PM steel is just steel. It welds like any other steel. Use the right filler and extension metal as Hoss said.
 
DevinT said:
For full tang knives, tig weld with 410 stainless filler rod. Use 410, 416, 420, aeb-l for the tang.

For narrow tang knives, mig weld.
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Hoss: why mig for narrow tang knives, and what constitutes a narrow vs: full tang knife? Forgive me for asking but I have an Inquiring mind,
 
I think because it matters less how it looks when you're done. But on a full tang knife, TIG welding allows you to make sure you have a joint that can be finished flush where the tang is exposed more easily.
 
Narrow tang = hidden tang, no need for it to be stainless because it’s encased in the handle. You can of course tig weld it, mig is just faster.

Full tang, the tang is exposed and the weld won’t patina if it’s stainless.

All welds need to be 100% penetration welded.

Hoss
 
I have leftover pieces of M390 which I would like to weld together in the tang area of full tang knives. The weld would not show except at the edges of the tang. I plan to have a professional do the welding before heat treat. Which filler would you recommend?
Tim
 
410 filler will work for all stainless and alloy cutlery steels, mild steel filler for low alloy and carbon steels.

Hoss
 
DevinT said:
410 filler will work for all stainless and alloy cutlery steels, mild steel filler for low alloy and carbon steels.

Hoss
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I have some inco625 wire left over from a job. Would high nickel filler work or could it cause problems?
 
That high of nickel might not have the same appearance when finished but I don't think it would cause any structural problems. Most "trouble job" fillers are high in nickel.
 
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