AISI 616 Weldability?

[4fletch]

I'm unfamiliar with this type stainless steel or it's weldability, yet have an emergent need to add .050" of weld build up to bars of this material for alignment purposes. Can anyone provide guidance?? Thanx is advance.

 

[metengr]

The designation you refer to is probably ASTM A565 Grade 616, which is a 422 stainless steel. This is a martensitic stainless steel for elevated temperature service.

This is a weldable alloy. However, could you please provide specific service details? The reason for my asking is for the proper selection of filler metal. For service temperatures below 1000 deg F, an Inconel or Ni base filler metal would work.

AISI Type 422 will require a 500 deg F preheat, and stress relief that could result in warpage to a finished product.

 

[4fletch]

Thanx metengr. IP turbine application. Steam temp should be 980 to 998 F. We need to raise stationary blade ring elevations .050". Intent is to apply weld build up to 4"L x 2.5"W x .75"T spacers, then surface grind to required dimension. Actually my plan at present is to use Inco filler with 400 deg F preheat and skip the PWHT. While this will leave very hard heat affected zone, am anticipating/hoping not to have a problem in this application. Schedule critical.

 

[metengr]

For this application, totally agree with your approach and the elimination of PWHT. I would use Inconel, as you suggested. Perform a PT after weld repair.