焊工考试用衬气盒焊工考试时，常遇到使用ＴＩＧ焊打底的奥氏体不锈钢试件，这时要求在试件背面村保护气。我们自制了一个衬气盒，见右图。该盒用δ＝２ｍｍ的Ａ３板制作。使用时，先充保护气，气流大小只要用手能感觉到小孔内有气体流出即可，然后，将其放置在试件背面３... Welder examination with gas box welder examination, often encountered in the use of TIG welding bottom austenitic stainless steel specimens, then asked the village on the back of the specimen protective gas. We made a self-contained gas box, see photo to the right. The box is made of A3 plate with δ = 2 mm. When used, the first protection of gas, the size of the air as long as the hand can feel the small hole out of the gas can be, and then placed on the back of the specimen 3 ...