Saturday, May 5, 2012

Re: [MW:14194] Welding C45 (1045)

This is due to the high carbon content of C45. I would suggest that you increase the preheat to 200 and after completion of the welding you perform the so called hydrogen back out treatment by maintaining the preheat temperature at 200 - 250 deg C for 2 hours.
I would suggest also to use a lower heat input process (GTAW or SMAW with low hydrogen electrodes)
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager


----- Original Message -----
From: LeONarD P [metpick@gmail.com]
Sent: 04/05/2012 22:26 MST
To: "Materials & Welding" <materials-welding@googlegroups.com>
Subject: [MW:14187] Welding C45 (1045)



Dear All expert

Welding C45 (1045) steel (Pivot Boss) to S275JR (main
structure)

1045 Pivot Boss is casting part.
S275JR is steel plate

For a project I need to weld a C45 (1045 steel, 0.45% carbon Thick 100
mm) on a S275JR steel ( Thichness 30 mm.)

Joint design & condition weld: T-butt joint, double bevel, CJP. Bevel
at S275JR steel.
preheat 110 C
minimum,. interpass temp 220 C max.
by FCAW process.
A5.20 / E71T-1C


After weld, the problem is crack appear along on surface casting
part (1045 steel)

How to solve this problem.

Thank you very much.
leonardd..

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