RE: 15542] PWHT requirement in welding of SA564 Type 630 condition A

[pgoswami]

Hi Prasanna,

 

ASTM A564 type 630,  may be furnished in the solution-annealed or age-hardened condition.See below for clarifications on the base metal properties."A" indicates annealed conditions for  the base metal.

 

GTAW electrodes, ER630. The nominal composition (wt. %) of these electrodes is 16.4 Cr, 4.7 Ni, 3.6 Cu which are  are primarily designed for welding ASTM A 564, Type 630,and some other precipitation-hardening stainless steels. Dependent on the application and weld size, the weld metal may be used either as-welded, welded and precipitation hardened, or welded, solution treated and precipitation hardened.

 

Advisable route would be :-

• Check the hardness of the shaft and if possible take a microstructure replica, to be confirmed that the base metal  solution annealed only.
• If the  base metal is solution annealed , then proceed with the deposition by GTAW.
• The usual precautions (including preheat and control of interpass temperature) adopted for welding of 300 series alloy should be followed for this alloy.
• 630 weld metal provides the best properties after solution annealing and aging.
• It would be advisable to check the hardness following  welding. If hardness around 35- 40 HRC is required, accordingly perform solution annealing and aging as specified below. Typically  1025 or 1050 Deg C  aging would be preferred, there may be a few points in reduction of hardness but the ductility (% El) would be more which would  more make the weld deposit more crack-resistant.

See the attached literature also for guidance.

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-p...@sympatico.ca,

pgos...@quickclic.net

 

 

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Prasanna
Sent: Wednesday, October 10, 2012 3:40 PM
To: material...@googlegroups.com
Subject: [MW:15542] PWHT requirement in welding of SA564 Type 630 condition A

Dear experts,

Please provide following information for the weld build up of approx.5mm with ER630 in SA564 Type 630 condition A.This material will be used as Shaft in a roatating equipment after repair.

 

1.Preheating requirement

2.PWHT is required or not.

 

 

Thanks & regards,

Prasanna

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