焊工试题2（Welders question 2）.docVIP

焊工试题2（Welders question 2） The middle class occupation skill appraisal theory examination papers A: fill in the blanks (each 1.5 points, a total of 30 points) 1. welding inspection method consists of (destructive) and test (non destructive testing) two categories. The 2. basic forms of welded joints can be divided into (butt joint, corner joint (T), joint), (joint) 3. kinds of non destructive testing methods have (ray test), (ultrasonic testing), (magnetic particle inspection). 4. welding external defects are common weld size requirements, arc pit, (undercut), (burn), wrong side surface porosity, Surface crack. 5. welding cracks can be divided into (hot crack), (cold crack), reheat crack. 6. harmful elements in weld metal of nitrogen, oxygen, (hydrogen), phosphorus (sulfur), etc.. 7. TIG welding can be divided into (manual welding and automatic welding) two. 8. according to the classification method of resistance welding process, welding (welding), (welding) three basic methods. 9. electric welding specification and 300A (500A) two. According to the characteristics of 10. electrode slag coating after melting into (acid) and the electrode (alkaline) electrode. Two, choice: (the selected answer corresponding to the letters in brackets, one in each of 2 points, a total of 20 points) 1. welding, arc welding transformer overheating due to (A). A. B. C. welding cable welding machine overload long cable terminal Electric arc welding rectifier is 2. (A) electric arc welding power source. A, DC B, AC 3. welding thick steel plate with acid electrode by DC (A), and the welding of thin steel plate, cast iron, nonferrous metals, should be used in reverse. A, right B, reverse C, limit 4. sulfur will lead to weld high temperature brittleness, thermal crack, (B) will lead to low temperature brittleness, cold crack. A, B, C, carbon sulfur and phosphorus 5. chemical metallurgy, commonly used (B) slag desulphurization and dephosphorization. A, B, C, neutral alkaline acid 6. austenitic