American Welding Society Forum
Can someone please give some suggestions regarding the welding of A514 Gr.B to A514 Gr.B. We are trying to weld one inch thick plate to one inch thick plate. Both plates are A514 Gr.B. (a.k.a T-1). I was wondering if someone could tell me what filler metal, shielding gases, and preheat would be required? Thanks for your help!
There are options for filler metals when welding A-514. If weld metal base metal strength needs to be similar than E-11018 Smaw and similar GMAW/FCAW filler metals can be used.
US Steel used to publish a book with useful welding information for "T1".
1) Low Hydrogen processes are nearly always required
2) preheat reduces tendancies to crack,
3) excessive heat input and/or high preheat interpass will give you a weld that will pass RT/UT but are not as strong as those properly welded
4) Don't jam together tee and corner joints Leave room for contraction
5) Don't gouge with oxyfuel processed
6) Thermal straightening can cause problems if not carefully controlled
7) Similar to the military "HY-xx" steels
I agree with Pipewelder_1999's answer. From our experience with hydro penstocks and power station draught fans made from ASTM A514 Gr J you should not under-estimate the tendency of hydrogen induced cracking, the hardenability for this material at this thickness (25mm) is high. We used FCAW filler E110T5-k4 and a shielding gas mix of 84% Ar - 16% CO2 with success on this material.
While welding 5" thick gear tooth rack butt splices on A514-94Q material, we used the following:
E110T1-K3, .045" Flux Core
75%Argon / 25% CO2 shielding gas
350 degree minimum preheat with 500 degree max interpass temp
To keep it from cracking:
Once you preheat, don't let it cool below 350 until you've finished the weld.
Preheat a large area of the surrounding base metal.
When you've finished the weld, ensure the surrounding base metal is still 350. Heat it again if you need to.
Don't let it cool off too fast. We would wrap the weld and surrounding base metal with K-Wool insulation, and leave it on there for 12 hours.
Delayed cracking can be a problem, especially if it cools too fast.
We would wait 72 hours before performing MT and UT inspection for cracks.
If you have to make repairs, don't forget to preheat and slow cool just like the original weld, if not with greater care.
Let us know what worked best for you!
GO TO www.weldreality.com visit ASTM Steels its all there
Just wanted to say thanks to all of the folks offering help!
I just ran a PQR for A514 Gr F, I have no Idea the difference of GR F and GR B with out looking at the MTR of the GR B but we used E110T1-K3 with a 75/25 Argon/CO2 mix and had great success.
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