Filler metal selections

Date 01-09-2005 02:10

I’m going to gmaw one quarter in. a36 mild steel to three-sixteenths in. 316l ss that will have a service temp. of 1,000 deg. I have done some research and have found two filler metals that should work. They are; er308 and 309l. Suggestion’s please!

Jim

By MBSims

Date 01-09-2005 03:20

ER309 or ER309L is the better choice. Doesn't need to be an "L" grade though if you're welding to carbon steel.

By GRoberts (***)

Date 01-10-2005 15:32

Since your application is at high temperatures, and thermal loading &/or fatigue may be an issue, I would suggest using a nickel based filler metal so that the coefficient of expansion will be inbetween the stainless and carbon steel, thus reducing the stress caused by the high temperature as compared to using a stainless filler metal. ERNiCr-3 may be suitable for you application.

By MBSims

Date 01-11-2005 01:10

GRoberts is correct about the thermal expansion issue. Carbon migration in the A36 HAZ will also be an issue. But, on second thought carbon steel is going to undergo severe graphitization at 1000 F. Why not use 2-1/4Cr1Mo instead of A36?