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Explore the World of Soft…e: Engineering & Science
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Explore_the_World_of_Software_Engineering_and_Science_HRS_Software_1998.iso
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WELDING.TXT
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1994-11-01
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Stainless steels are readily welded by all standard welding procedures.
Inert gas welding is the preferred process. Coated electrodes are some-
times used but flux removal is difficult and could cause corrosion
problems. Although the response to welding for stainless steel may be
different from carbon steel, the differences are due to variations in
properties as noted below:
Comparison of Welding Characteristics
Carbon Stainless
Property Steel 304 Differences
──────── ────── ──────── ───────────
Melting Range C 1538 1400-1455 Less heat needed for fusion
Electrical
Resistance
Microhm-cm @ 20C 12.5 72 More heat generated for same current
Improves resistance welding
Heat Conductivity %
100C 100 28 Sharper gradients - Greater warping
>650C 100 66 Slower diffusion of heat through
base metal
Coefficient of
Expansion x 10^6 6.5 9.8 Greater expansion and contraction
during heating and cooling
Heat-Affected Zone Hard Ductile HAZ can be sensitized to
intergranular attack
For more information see NiDI Publication 11 007 - "Guidelines for the
Welded Fabrication of Nickel Containing Stainless Steels for
Corrosion Resistant Services".