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Re: [MW:22957] Quench,Temper material

By Materials & Welding
Hi,

Quenched and Tempered steels are weldable but due to the high carbon content (Hardenability) leading to a hard heat-affected-zone (HAZ) and susceptibility to cracking. Due to this reason there is  always a heat input limit recommended by the manufacturer for the welding of Q&T steels, as there can be problems with softening of the HAZ when the cooling rate of the weld is slower than that of the quenching process. This is why AWS D1.1 restricts oxygen gouging of Q&T steels. You can do other cutting or gouging process which produces less heat input on Q&T steels.

You may refer the below link for further reference.

http://www.twi-global.com/technical-knowledge/faqs/material-faqs/faq-are-quenched-and-tempered-qt-steels-readily-weldable/


Regards,
LALU
​LINKS MIDDLE EAST 
ABU DHABI, UAE​


On Thu, Jan 1, 2015 at 2:19 PM, Ali Asghari <asgharialigl@gmail.com> wrote:
Dear All
1-what is meaning of this paragraph on AWS D1.1: When quenched and tempered steels are welded, the heat input shall be restricted in conjunction with the maximum preheat and inter pass temperatures required. Such considerations shall include the additional heat input produced in simultaneous welding on the two sides of a common member. does any body have same exprience about this material?
2- For what Oxygen gouging of quenched and tempered steel shall be
prohibited but other thermal cutting or removal is permitted?

Regards.

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