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WELDING.TXT
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1991-02-07
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Stainless steels are easily welded by all standard welding procedures although
the response to welding is quite different from carbon steel.
The differences are due to variations in properties as noted below:
Differences in Welding Characteristics of type 304 Stainless Steel as Compared
to Carbon Steel
Property Carbon Type Effect
Steel 304
Melting Range F 2800 2550-2650 Less heat needed for fusion.
Electrical
Resistance
Microhm-cm @ 68F 12.5 72 More heat generated for same current.
Improves resistance welding.
Heat Conductivity %
@212 F 100 28 Sharper gradients; Greater warping;
>1200 F 100 66 Slower diffusion of heat through base
metal.
Coefficient of
Expansion per Fx10 6.5 9.8 Greater expansion and contraction
during heating and cooling.
Heat Affected Zone Hard Ductile HAZ can be sensitized to Intergranular
attack.