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52—1 请从下列同号码栏的词语中,选出适合下文( )内的词语。预热是为防止因急冷而产生的焊接热影响区的(A)和因此而产生的(B)而采取的措施。例如,对于80kg级高强钢,当板厚超过25mm时,就要把(C)的温度提高到150℃以上。在控制多层焊时的层间温度方面,设有下限温度和上限温度。控制下限温度,是为了防止(D),而控制上限温度,则是为了防止焊接金属和热影响区的(E)和脆化。词语:A、a.软化 b.硬化 c.脆B、a.低温裂纹 b.凝固裂纹
52-1 Please select from the following words in the same number column for the following () words. Preheating is a measure taken to prevent (A) in the HAZ due to quenching and (B) resulting therefrom. For example, for 80 kg grade high-strength steel, when the plate thickness exceeds 25 mm, the temperature of (C) should be raised above 150 ° C. In controlling the multi-layer welding layer temperature, there is a minimum temperature and maximum temperature. The lower limit temperature is controlled to prevent (D) and the upper limit temperature is controlled to prevent (E) and embrittlement of the weld metal and the heat affected zone. Words: A, a. Softening b. Hardening c. Brittle B, a. Low temperature cracking b. Solidification crack