Repair welding Inconel 718 with Hastelloy W?
Repair welding Inconel 718 with Hastelloy W?
(OP)
Howdy all,
I'm designing a repair for an Inconel 718 skin ~.070 thick with a crack in it. It is right next to a brazed doubler and the welder is worried about the braze metal contaminating the weld joint. He recommended using Hastelloy W weld filler metal instead of 718 to prevent any problems incase the braze metal mixes with the weld pool. I have looked around, but can not find any reference that says Hastelloy W is a valid filler wire for welding Inconel 718. Can anyone provide a reference or talk about Hastelloy W's compatability with precipitation hardenable Inconels? I'll be doing a precipitation heat treatment then an age heat treatment after welding as a stress relief.
Thanks,
-Kirby
I'm designing a repair for an Inconel 718 skin ~.070 thick with a crack in it. It is right next to a brazed doubler and the welder is worried about the braze metal contaminating the weld joint. He recommended using Hastelloy W weld filler metal instead of 718 to prevent any problems incase the braze metal mixes with the weld pool. I have looked around, but can not find any reference that says Hastelloy W is a valid filler wire for welding Inconel 718. Can anyone provide a reference or talk about Hastelloy W's compatability with precipitation hardenable Inconels? I'll be doing a precipitation heat treatment then an age heat treatment after welding as a stress relief.
Thanks,
-Kirby
Kirby Wilkerson
Remember, first define the problem, then solve it.





RE: Repair welding Inconel 718 with Hastelloy W?
http://www.haynesintl.com/pdf/h3017.pdf
http://www.haynesintl.com/pdf/h3055.pdf
RE: Repair welding Inconel 718 with Hastelloy W?
RE: Repair welding Inconel 718 with Hastelloy W?
I don't usually go outside of the manual in a welding repair, (and by I, I mean our very experienced welder, I'm just an engineer.) could you describe what is involved in qualifying a welding procedure? For what I'm doing I'm following the welding procedure in a manual, but making changes because the crack is beyond the limits in the manual. It was cracked and previously repaired, then cracked again, I think because they did not do a stress relief. I'm adding the stress relief and swithcing the filler wire from 718 to Hastelloy W.
unclesyd,
Great information. That was what i was looking for. I wanted to make sure that the two metals were compatible in a weld.
-Kirby
Kirby Wilkerson
Remember, first define the problem, then solve it.
RE: Repair welding Inconel 718 with Hastelloy W?
AWS D17.1 Specification for Fusion Welding Aerospace Applications
The Engineering Authority shall design the weldement and define the requrements. Performance and procedure qualifications must be maintained. Welding processes are developed to ensure quality welds. Two of the critical elements to the weld procedure are base metals and filler rods. These assignments have been based on comparable base metal characteristics, such as: Composition, Weldability, Mechanical Properties. Indiscriminant substitution of materials in a set of welding rod Group Numbers may lead to problems or potentially failures.
Hastelloy W metal is in group IIIA
Inconel 718 metal is in group IIIB
Engineering assessment is necessary prior to a change in materials, joint requalification is required.
RE: Repair welding Inconel 718 with Hastelloy W?
So what goes into requalifying a joint? Is there a standard set of tests that I can run on a set of weld specimens? Is this going to require a fatige study? I'm still a fairly new engineer, and havent' done a weld requalification before.
-Kirby
Kirby Wilkerson
Remember, first define the problem, then solve it.
RE: Repair welding Inconel 718 with Hastelloy W?
RE: Repair welding Inconel 718 with Hastelloy W?
To deviate from the approved weld procedure, you must both qualify the new weld procedure (test coupons) and sign off on the deviation (analysis). Refer to Advisory Circular 00-56, ASA 100 Standard and your Quality Assurance Program.
As the agent of the certificate holder are you the authorized design agent for the part or a repair depot?
RE: Repair welding Inconel 718 with Hastelloy W?
-Kirby
Kirby Wilkerson
Remember, first define the problem, then solve it.
RE: Repair welding Inconel 718 with Hastelloy W?
RE: Repair welding Inconel 718 with Hastelloy W?
-Kirby
Kirby Wilkerson
Remember, first define the problem, then solve it.
RE: Repair welding Inconel 718 with Hastelloy W?
Devations from approved repair procedures, opens both you and your employer to legal liabilty .