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Electrical resistance is often thought of as how easily electricity can flow through a specific material. Electrical resistance is the measure of oppositional flow to an electric current.
For example, silver and copper, both metals with only one valence electron, are more conductive to electricity. Welding is the process of joining metallic parts usually through the use of heat. Welding has been around for a long time. Early instances of welding can be traced to regions like India and Ireland.
Some of these examples go back as far as the Bronze Age. ASTM A has a wide scope. The standard covers electric-resistance-welded carbon and alloy steel tubing for use as mechanical tubing. It also covers square, round, rectangular, and special shape tubing.
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ASTM A513 Tubing
Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More A This specification covers round, square, rectangular, and special shape electric-resistance-welded carbon and alloy steel mechanical tubing produced by hot- or cold-rolling. The types of tubing covered here are: Type 1a, as-welded from hot-rolled steel with mill scale ; Type 1b, as-welded from hot-rolled pickled and oiled steel mill scale removed ; Type 2, as-welded from cold-rolled steel; Type 3, sink-drawn hot-rolled steel; Type 4, sink-drawn cold-rolled steel; Type 5, drawn over a mandrel; and Type 6, special smooth inside diameter. Heat and product analyses shall be made to determine the percentages of chemical elements, to which the steel specimens shall conform to. Tubing shall be free of injurious defects and shall have a workmanlike finish.
ASTM A513 Mechanical Tubing
ASTM A ASTM A a. ASTM D ASTM C ASTM F