焊接考试（Welding test）.docVIP

焊接考试（Welding test） Intermediate welding examination question of Dalian COSCO Shipping Engineering Co., Ltd. Name: job number: achievement: First, the multiple-choice question: 1 and (A) are the most effective measures to prevent cold cracking, hot cracking and hardening of the heat affected zone of low alloy steels. A. preheat B. to reduce heat input C. using DC reverse power supply D. after welding heat treatment 2. The most common defect in the welding of low-alloy structural steels is (A). A. cracks; B. pores C. not fusion, D. is not welded through 3. The most common crack in low alloy structural steel welding is (D). A. hot crack; B.; cold crack C. reheat crack; D.; thermal stress; crack 4. When welding pearlite heat resistant steel by (C) method, no preheating is needed before welding. A. electrode, arc welding, B., CO2, gas shielded arc welding C. argon arc welding D. submerged arc welding 5, martensite stainless steel welding joint produces intergranular corrosion tendency (B) A. is big, B. is small, C. is not inclined 6 and (D) are the most harmful elements causing intergranular corrosion of stainless steel. A. chromium, B., nickel, C., niobium, D. carbon 7. Prevention of hot cracks in stainless steel welding by adding A forming elements to the weld material. A. austenite B. martensite C. iron element D. pearlite 8, (C) stainless steel has a strong tendency to harden. A. austenite B. martensite C. iron element D. pearlite 9, welding stainless steel composite plate transition layer, generally used (A) welding method. A. electrode, arc welding, B. submerged arc welding C. argon arc welding D. CO2 gas shielded arc welding 10. Preheat the casting to (B) C before welding. A. 100 B. 200 C. 300 D. 400 Two. Fill in the blanks: 1, in arc welding, the form of droplet transfer mainly includes (short circuiting transition), small particle transition and large particle transition. 2. The external characteristic of the welder is the relation between the steady state (outp