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焊前准备用下述方法去除焊件表面的氧化物(Al_2O_3)及油污:第一次用10％的氢氧化钠10％的碳酸钠80％热水混合液(温度为80～90℃)洗涤1～2分钟,若油污较多可适当延长,但不允许另件发毛。取出用温水洗净;第二次用10％硝酸90％的热水混合液(温度为80～90℃)洗涤1分钟,然后用温水洗净。洗涤的范围在焊纵四周30毫米内,切忌过宽,否则另件将被严重腐蚀。
Pre-welding preparation The following methods are used to remove the oxide (Al 2 O 3) and oil on the surface of the weldment: for the first time, it is washed with 10% sodium hydroxide 10% sodium carbonate 80% hot water (temperature 80-90 ° C) 1 to 2 minutes, if more oil may be extended, but not allowed to piece hair. Remove the wash with warm water; The second time with 10% nitric acid 90% hot water mixture (temperature is 80 ~ 90 ℃) for 1 minute, then wash with warm water. The scope of the washing should be within 30 millimeters around the vertical edge of the welding rod and should not be too wide. Otherwise, the other pieces will be severely eroded.