Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
(OP)
Hi Expert,
Is there anybody can explain Longitudinal Crack observed on SAW Process with ERNiCrMo-3 ?
Is it because hot cracking by austenitic weldment, weld shape (Weld/Depth),segregation or flux ?
In this case I want to joint pipe to pipe (X65) with Clad 625 inside, there is no option , we have to use SAW process for this joint.
Your advise and knowledge would be meaningful
Thanks and Regard's
MrTungsten





RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
And they you are building up the steel over that, with what filler?
Pictures would help a lot. and a sketch also.
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P.E. Metallurgy, Plymouth Tube
RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
I have seen this weld made successfully numerous times without cracking; root pass with GTAW and fill with SAW in the shop. How are you making the root pass - not with SAW I should think.
RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
See excerpt from TWI below
Weld metal solidification cracking
Factors which control solidification cracking include alloy, welding process and welding conditions. For example, solidification cracking is a factor which limits the application of submerged arc welding, both with respect to applicable alloys and welding conditions. More generally, this type of cracking leads to restriction of weld shape, welding speed and technique.
RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
You will not be able to weld the full wall in a single pass.
Mixing the 625 and the steel will result in poor corrosion resistance (why the 625 is there to begin with), undefined (or mixed structure), dubious properties, and poor weldability.
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P.E. Metallurgy, Plymouth Tube
RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
In addition to the form factors, Carbon and Iron Dilution affects the cracking behavior of 625 overlays.625alloys inherently contains 3-4% Niobium, Nb-Carbide adds to hot cracking.
May I know what were the :
-SAW wire flux composition:
-Filler diameter used?
-The MTR report(C.A) with the same wire flux combinations.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
All provided answer are personal opinions or personal judgements only. It's not connected with any employers by any means.
RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
Root Pass, hot and Fill 1 pass, we use ERNiCrMo-3 which 625 filler wire , Welding Process GTAW.
Remaining fill pass use SAW Process with 625 filler metal,
RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
You still haven't defined the flux used and the crack location.
RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler
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P.E. Metallurgy, Plymouth Tube
RE: Hot Crack (Longitudinal Crack) SAW Process with ERNiCrMo-3 Filler