bridgebuster
Active member
- Jun 27, 1999
- 3,969
I need some advice for a developing a welding procedure: A709 Gr. 36 to A94, which was a high strength (fy = 45 ksi) silicone steel (0.3% max) used in bridge construction in the 40's and 50's. It also contains between 1.1 to 1.6% manganese. We don't have a chemical analysis; I'm going solely on ASTM.
We need to weld downspout brackets to a number of closed box columns, with 1/2" to 9/16" plates. The welds are 1/4" filets. I was looking at an article in the AISC Journal from 1988 by David Ricker about welding to various types of steels but A94 was not on his list. In terms of yield strenth the closest thing was A242.
I also calculated carbon equivalents using a variety of formluas and obtained a variety of results.
AWS - NG, CE ~0.56;
Standard formula - OK, CE~0.51. Four other formulas were NG and two were OK.
Based on what I read, I'm thinking of Pre-heat to about 200 degrees and calling for low hydrogen rods.
Any ideas? Thanks
We need to weld downspout brackets to a number of closed box columns, with 1/2" to 9/16" plates. The welds are 1/4" filets. I was looking at an article in the AISC Journal from 1988 by David Ricker about welding to various types of steels but A94 was not on his list. In terms of yield strenth the closest thing was A242.
I also calculated carbon equivalents using a variety of formluas and obtained a variety of results.
AWS - NG, CE ~0.56;
Standard formula - OK, CE~0.51. Four other formulas were NG and two were OK.
Based on what I read, I'm thinking of Pre-heat to about 200 degrees and calling for low hydrogen rods.
Any ideas? Thanks
