Electron Beam Welding Standards?
Electron Beam Welding Standards?
(OP)
Hi Experts,
We are planning to EB weld the following combinations:
1) 4140 and 718
2) K500 and 718
3) K500 and MP35N
The first material is a cylinder piston and 2nd material is a pin to be welded into a tight fit hole in the piston. Hole is perpendicular to piston axis. Penetration depth is fine since we have talked to couple welders. But just wondering if any industry standards relevent we can use to establish welding procedure and also NDT and mechanical testing since this is a subsea application and we have to meet NACE0175, API 6A, etc.
Background: These parts are going to see differential pressure - tend to break weld and pop out the pin and axial force to piston axis on the pin - bending the pin. Prior welding, these materials are in the condition close to the hardness limits set by NACE.
Ideally we don't want to do any PWHT since they are dissimilar material and we figure it is pretty hard to do so. Any comments or ideas are highly welcome and appreciated.
We are planning to EB weld the following combinations:
1) 4140 and 718
2) K500 and 718
3) K500 and MP35N
The first material is a cylinder piston and 2nd material is a pin to be welded into a tight fit hole in the piston. Hole is perpendicular to piston axis. Penetration depth is fine since we have talked to couple welders. But just wondering if any industry standards relevent we can use to establish welding procedure and also NDT and mechanical testing since this is a subsea application and we have to meet NACE0175, API 6A, etc.
Background: These parts are going to see differential pressure - tend to break weld and pop out the pin and axial force to piston axis on the pin - bending the pin. Prior welding, these materials are in the condition close to the hardness limits set by NACE.
Ideally we don't want to do any PWHT since they are dissimilar material and we figure it is pretty hard to do so. Any comments or ideas are highly welcome and appreciated.





RE: Electron Beam Welding Standards?
For starters, I would use ASME B&PV Code, Section IX for guidance regarding development of a Weld Procedure Specification and qualification of the procedure using coupons for tensile, bend and hardness traverses.
Regarding nondestructive testing requirements and acceptance criteria, I would use ultrasonic testing, as a volumetric examination method for the EB weld along with Liquid penetrant testing. Perhaps look at NORSOK standards for NDT acceptance.
RE: Electron Beam Welding Standards?
Does ASME Sec. IX cover EB welding and these materials specifically? In your experience, can we possibly get away with PWHT? Thanks a lot for your replay.
RE: Electron Beam Welding Standards?
RE: Electron Beam Welding Standards?
To answer your first question, no not all of your materials are listed in Section II. But this does not matter because Section IX is a service code book meaning it can be used for development of welding and brazing procedures and qualification of welders/brazers.
Agree with stanweld regarding a defocused beam and generous preheat. This is why microhardness testing as part of WPS qualification will be necessary.
RE: Electron Beam Welding Standards?
RE: Electron Beam Welding Standards?
RE: Electron Beam Welding Standards?
RE: Electron Beam Welding Standards?
RE: Electron Beam Welding Standards?
If what you are asking are there actual WPS qualified for you to review and use? No. You need to customize this setup and optimize the welding essential variables yourself. Section IX provides an excellent guide for what variables to select. Yes, it will take time and cost but this is what is needed to ensure a quality product. There are no shortcuts.
Regarding welded structures, you will have to generate weld coupons and evaluate the resultant mechanical and possible corrosion properties (if applicable) since these are autogenous welds. Good Luck.
RE: Electron Beam Welding Standards?
RE: Electron Beam Welding Standards?
I would search the web sites below for general welding information related to 718 and K500.
http://www.specialmetals.com/products/index.php
For MP35N
http://www.cartech.com/techarticles.aspx?id=1450
RE: Electron Beam Welding Standards?
In addition to the ASME B&PV Code, there are some ISO standards that are applicable to electron beam welding:
ISO/TR 17671-7 Welding — Recommendations for welding of metallic materials — Part 7: Electron beam welding
ISO 13919-1 Welding — Electron and laser-beam welded joints — Guidance on quality levels for imperfections — Part 1: Steel
ISO 15614-11 Specification and qualification of welding procedures for metallic materials — Welding procedure test — Part 11: Electron and laser beam welding
ISO 15609-3 Specification and qualification of welding procedures for metallic materials — Welding procedure specification — Part 3: Electron beam welding
RE: Electron Beam Welding Standards?
Thank you, metengr. I will check them out.
RE: Electron Beam Welding Standards?
It's a shameless plug none the less, but we do provide this service if you are interested: ht
BUT there are others out there as well.. EBW can be complicated process and not all shops are created equal- but if you go with someone that has been around awhile you should be able to find the expertise you are looking for to ensure a quality, repeatable weld.
RE: Electron Beam Welding Standards?
Thanks a lot for your info and that is one of things I asked for originally. A star for your post. We have another engineer leading this right now and he has in talk with couple shops. I will for sure contact you if those don't go well. I like the information on your webpage.