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一、填空 :1.焊缝金属脱氧有三个途径 :、、。2 .手工钨极氩弧焊的焊接规范主要是 :、、、、、。3.手工电弧焊电弧引燃一般有两种方法 ,即、。碱性焊条适应引燃 ,可以有效地防止产生。4 .磷在焊缝中主要害处是、、、。常用作脱磷的氧化物是 ,由于酸性焊条中含极少 ,因此脱磷效
First, fill in the blank: 1. There are three ways to weld metal deoxidation: ,,. 2. Manual TIG welding of the main welding specifications: ,,,,,. 3. Manual arc welding Arc ignition generally have two ways, that is, Alkaline electrode to adapt to ignition, can effectively prevent the generation. The main disadvantage of phosphorus in the weld is ,,,. Commonly used as a dephosphorizing oxide is, due to very little acidic electrode, so dephosphorization