钣金焊接工艺及设备.pptx

第7章 钣金焊接工艺及设备 ;7.1 气焊工艺;焊前准备;选择焊丝 ;选择气焊熔剂 ;选择焊接火焰 ;焊接金属与火焰性质的选择 ;气焊操作 ;预热;焊接 ;收尾 ;7.2 手工电弧焊工艺及设备;电弧焊机的使用 ;焊条的选用 ;焊条电弧焊的基本操作技能 ;焊条规格的选择;调整焊接电流 ;引弧 ; 运条 ;焊接位置 ;平对焊接;平角焊接;立焊;横焊;仰焊;收尾;7.3 点焊工艺;7.4 气体保护焊工艺及设备;熔极惰性气体保护焊操作步骤;;;; 焊接电流与焊丝直径和焊件厚度的关系;;选择焊枪的倾角;焊接速度与焊件厚度的关系表;焊接方式 ;??氧化碳气体保护焊操作步骤 ;7.4.3 焊接缺陷的原因与预防;;1、Genius only means hard-working all ones life. (Mendeleyer, Russian Chemist)? 天才只意味着终身不懈的努力。20.8.58.5.202011:0311:03:10Aug-2011:03 2、Our destiny offers not only the cup of despair, but the chalice of opportunity. (Richard Nixon, American President )命运给予我们的不是失望之酒，而是机会之杯。二〇二〇年八月五日2020年8月5日星期三 3、Patience is bitter, but its fruit is sweet. (Jean Jacques Rousseau , French thinker)忍耐是痛苦的，但它的果实是甜蜜的。11:038.5.202011:038.5.202011:0311:03:108.5.202011:038.5.2020 4、All that you do, do with your might; things done by halves are never done right. ----R.H. Stoddard, American poet做一切事都应尽力而为，半途而废永远不行8.5.20208.5.202011:0311:0311:03:1011:03:10 5、You have to believe in yourself. Thats the secret of success. ----Charles Chaplin人必须相信自己，这是成功的秘诀。-Wednesday, August 5, 2020August 20Wednesday, August 5, 20208/5/2020 6、Almost any situation---good or bad---is affected by the attitude we bring to. ----Lucius Annaus Seneca差不多任何一种处境---无论是好是坏---都受到我们对待处境态度的影响。11时3分11时3分5-Aug-208.5.2020 7、Although the world is full of suffering, it is full also of the overcoming of it.----Hellen Keller, American writer虽然世界多苦难，但是苦难总是能战胜的。20.8.520.8.520.8.5。2020年8月5日星期三二〇二〇年八月五日 8、For man is man and master of his fate.----Tennyson人就是人，是自己命运的主人11:0311:03:108.5.2020Wednesday, August 5, 2020 9、When success comes in the door, it seems, love often goes out the window.-----Joyce Brothers成功来到门前时，爱情往往就走出了窗外。11:038.5.202011:038.5.202011:0311:03:108.5.202011:038.5.2020 10、Life is measured by thought and action, not by time. ——Lubbock 衡量生命的尺度是思想和行为，而不是时间。8.5.20208.5.202011:0311:0311:03:1011:03:10 11、To make a lasting marriage we have to overcome self-centeredness.要使婚姻长久，就需克服自我中心意识。Wednesday, August 5, 2020August 20Wedn