关于硬度测试的? 1. prior to cutting, use a steel stencil to identify the material to be tested. 2. Machine and polish a 1/2 inch (13mm) thick specimen from the weld for the cross sectional hardness tests; The testing side of the specimen shall be surface groud wet and shall be polished with at least a 600 grit paper so the weld zones etch out clear and sharp , so easily measured impression are are obtained . 大家参与讨论一下吧,特别是标红色部分。查看更多1个回答 . 3人已关注