Use Caution When Specifying “Seal Welds”
Welding Innovation Vol. XVI, No. 2, 1999Use Caution When Specifying Seal Welds Practical Ideas for the Design Professional by Duane K. Miller, , FileIntroductionWhat is a seal weld? AWS , Standard WeldingTerms and Definitions, defines a seal weld as: Any welddesigned primarily to provide a specific degree of tight-ness against leakage. The purpose of a seal weld maybe to contain a fluid either gaseous or liquid. In themechanical and structural fields, seal welds are used mostoften not to prevent leakage out of a container, but to pre-vent entry of a fluid into a space where some type ofharmful behavior, often corrosion, is expected to occur. Inthese fields, seal welds are frequently used to precludemoisture and oxygen-laden air and water from enteringthat welds may be specified on parts to be galvanized toprohibit pickling acids and/or liquid zinc from entering into aspecific region. For architecturally exposed steel that is tobe painted, seal welds may be specified to prevent unsight-ly rust bleeding.
Use Caution When Specifying ... stress risers. A stainless steel nameplate was to be applied to the unit, and a seal weld was called for to attach this nameplate. The entire unit received a special, multi-coat paint system to preclude corrosion, and the seal weld
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