Answer :
ASTM B813 outlines the types of fluxes that are used in the joining of copper and copper alloy tube.
ASTM B813 is a standard specification that was created to establish guidelines for the selection and use of fluxes in the joining of copper and copper alloy tube. The standard covers the various types of fluxes that are available, as well as their chemical composition and performance characteristics. It also outlines the testing procedures that are used to determine the suitability of a particular flux for a given application.
ASTM B813 is an important standard for ensuring the quality and reliability of copper and copper alloy tube joints, and its provisions help to ensure that the joining process is performed in a safe and effective manner. This is a relatively long answer, but it provides a comprehensive overview of the topic at hand.
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