Why is 20 ft-lb impact energy sufficient for a weld when the specification for the plate requires 40 ft-lb at -40° C (-40° F)?
The ASME has determined that 20 ft-lb is an adequate toughness for service in a particular class of applications. This level of toughness is not high enough to correlate well with the observance of intermetallic phase in the microstructure and the associated loss of corrosion resistance in a duplex stainless steel mill plate. The duplex stainless steel plate structure is tough enough that it may still show significant impact energy even after significant intermetallic phase formation. On the other hand, a weld metal may occasionally have toughness less than 40 ft-lb even when no intermetallic phase is present. For example, weld toughness is particularly affected by the presence of oxygen in the weld, as may occur with flux-shielded welds.
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