Transcription of Use Caution When Specifying “Seal Welds”
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Use Caution When Specifying “Seal Welds”
Welding Innovation Vol. XVI, No. 2, 1999 Use 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.
Galvanizing Issues One of the more common applications for seal welds is in assemblies that are required to be hot dip galvanized (Figure 6). The American Galvanizers Association (AGA) defines three classes for welded assemblies that will be galvanized. Class 1 Joints are held together by a full seal weld.
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