4/29/2023 0 Comments Starrett 3814 ManualIs it near any critical part or assembly features? What is the designed minimum hardness requirement for the feature to work as intended? At what distance away from the welded joint does the material meet the requirement? How will a larger weld, smaller weld, different weld wire, weld type, etc. Therefore, critical features should incorporate changes to local material hardness throughout the manufacturing process.Ī common example is determining the heat affected zone of a welded joint. Incorporating machining, welding, and other manufacturing processes will change the molecular structure of the materials. Design Considerationsĭesign engineering requirements for material meeting specific minimum hardness numbers must be followed strictly by manufacturing engineering processes to produce a part that works as intended. The hardness numbers are linearly proportional to tensile strength numbers and can be compared using reference charts that have been developed by performing non-destructive hardness tests and destructive tensile tests on the same material samples. The superficial scale uses a lighter load and can be used for thinner material. The Rockwell hardness test is recommended to be used on material at least 10x thicker than the indentation depth.
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