Transcription of Use Caution When Specifying “Seal Welds” - Foundation
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Use Caution When Specifying “Seal Welds” - Foundation
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. For architecturally exposed steel that is tobe painted, seal welds may be specified to prevent unsight-ly rust bleeding.
What is a “seal weld?”AWS A3.0, Standard Welding Terms and Definitions, defines a seal weld as: “Any weld ... Casual Treatment of Seal Welds The minimum heat input requirements imposed by AWS D1.1may be violated when the seal weld is made. Table ... including adherence to the minimum fillet weld size. Failure to do so may result in weld ...
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