Welding procedure for 4130

Date 12-06-2013 15:39

Hi, i`m writting a procedure for a groove weld on 4" pipe Sch XXS (17 mm wal thickness). The joint is SA-106 Gr.B with AISI 4130. Root must be welded with SMAW, fill can be GMAW/FCAW/SMAW.

What do you think about the following?:
-Root pass: SMAW 7010-A1
-Fill: FCAW - E410NiMoT0-4

Preheat: 250 ˙C
Interpass: 300 ˙C

Postweld:
650 ˙C - 1 hr / in - min. 2 hs.
Cooling rate: Air.

By Len Andersen (***)

Date 12-18-2013 19:09

Julio Herrera | Welding Manager - CWI, Ladies and Gentlemen,
My guess is we are doing a ASME weld. What you say sound reasonable but more details would be helpful. The consumable manufacturers might be helpful. It is an expensive weld for a critical application is my guess. A welding engineer sign off might be required. I hoped this is helpful.
Sincerely
Len Andersen weld@speamil.org
914-536-7101 / 914-237-7689 (H) / 800-428-4801 USA
POB 1529 / NYC 10116-1529 ( $1160 per year Caller
Box GPO NYC / Most Secure Service At Largest Post
Office USA )

www.lenandersen.com

By 803056

Date 12-18-2013 23:26

I find the choice of filler metals baffling.

At the very least, I would expect you would want to use a low hydrogen electrode that was baked before use.

Al

By 46.00

Date 12-19-2013 13:14

Julio, it is very confusing when people post the same question in multiple sections of the forum.
I have already expressed some surprise at your choice of filler wire, but after dealing with this material in small amounts for many year's now, very little surprises me.