目录摘要..................................................................................................................................................1引言..................................................................................................................................................2第一章油管焊接的母材选用及加工...........................................................................................31.1母材的选用.....................................................................................................................31.2钢材的矫正原理及方法.................................................................................................31.3划线...................................................................................................................................41.4号料.................................................................................................................................41.4.1号料的方法............................................................................................................51.4.2样板的分类............................................................................................................51.4.3号料的作用............................................................................................................51.5成形方法............................................................................................................................51.6气割圆筒...........................................................................................................................61.7钻孔.................................................................................................................................61.8Q235的热处理..............................................................................................................6第二章油管焊接的装配工艺.......................................................................................................82.1坡口形式与焊接技术.................................................................................................82.1.1坡口形式...........................................................................................................82.1.2坡口的加工方法.................................................................................................92.2装配...............................................................................................错误！未定义书签。第三章油管焊接的焊接工艺...................................................................................................133.1Q235的焊接性..............................................................................................................133.2焊接方法及设备的选择...............................................................................................143.2.1首选：手工电弧焊.............................................................................................153.2.2次选：CO2气体保护焊.....................................................................................153.2.3再选：熔化极活性气体保护焊（MAG焊）..............................................203.3、焊前的准备...................................................................................................................223.4焊接工艺过程................................
