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Companies are increasingly using weld overlaid carbon steel components to avoid the cost of solid
alloy
By Carroll McCormick
Nickel Magazine, March 2008 -- The Quebec, Canada company Brospec 2001 LP.
recently delivered 133 sections of stainless steel weld-overlaid carbon steel pipe, tees, reducers and
flanges to an acid plant. The carbon steel pieces were overlaid with a two-pass weld overlay using W30938
(39MoL) and W31637 (316L) on their inside surfaces to handle the corrosive conditions created by the presence
of hydrogen sulphide.
Brospec started with a 3 millimetre (mm) thick layer of W30938, layed down circumferentially with 2.4 mm
diameter flux cored wire AWS class E309LMoT0-3, using an open arc welding process (self-shielded Flux Cored
Arc Welding). This layer acts as a buffer layer to prevent dilution of the final weld pass with the base
metal. The final layer consisted of 3 mm of W31637, layed down with 2.4 mm diameter flux cored wire AWS class
E316LT0-3.
A total of 3,764 kilograms of W30938 welding wire and 4,000 kg of W31637 welding wire was used.
The resulting weld overlay deposit can handle the corrosivity of the process conditions and is a
cost-effective way to produce 316L clad pipe.
Carroll McCormick is a Montreal-based freelance writer..
Photos: BROSPEC 2001 LP
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