Did the plate undergo certain cold working process (rolling,bending,etc) prior to welding ? if so it would likely due to residual stress that cause the cracking, you could try to prolonge the preheat time and see if it still cracking or not
Also I found that the cracking susceptibility increases with an increase in the welding current, and decreases with an increase in the welding speed or the electrode wire feed rate. It also increases with increases in the plate rolling reduction ratio .
Regards
Richard Napitupulu
JWES Certified Welding Engineer CWEng
QA/QC Site Representative Pertamina Hulu Energy
Offshore West Java
From: "GERING, Erwin" <Erwin.GERING@airliquide.com>
To: materials-welding@googlegroups.com
Sent: Wed, 28 July, 2010 1:12:25 PM
Subject: [MW:6161] RE: 6154] Transverse Crack
Mostly these crackings are related to hydrogen.
Can you please specify filler metal (wire – flux combination) and hydrogen precautions (redrying?) and thickness.
With kind regards, mit freundlichem Grüss, salutations, met vriendelijke groet,
Ing. Erwin GERING, IWE
Corporate Product Manager - ALW-corp. mktg - SAW Wire & Flux
Product Manager - ALW-NL & BeLux - Welding Consumables
(Tel.: 31(0)76 – 54 83 222 ÈMob.: 31(0)6 - 55 87 29 21
Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens waman nilesh
Verzonden: dinsdag 27 juli 2010 18:58
Aan: materials-welding@googlegroups.com; materials-welding@goolegroups.com
Onderwerp: [MW:6154] Transverse Crack
I want to know the exact cause off transverse crack observed visually on the surface of the weld.
Welding done with SAW
Material - SA 516 GR. 70
Thickness- 32 mm
We have done pre heating at temperature 100 deg. C but from top side also check the filler wire material
after crack are observed which are ok.
Please share your experience with me on this issue.
Regards,
Nilesh
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