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                                                        2015
                                                    
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                                                Common flaws and causes of spot welding:  1.Rosin joint:  Misaligned electrode  Low welding current  Short welding time  welding over-current (Thin plate-not more than 1mm)  Improper water cooling of electrode  2.Crack at welding point:  Direct cause: Metallic property of plate  Indirect cause: short duration, high welding pressure, small area of electrode head, long time of use of electrode  3.Piercing at welding point:  Direct cause: short duration, high welding current, low welding pressure, dirt attached to plate, metallic property of plate  Indirect cause: Overlong welding, large area of electrode head, long time of use of electrode, excess matching gap of plate, unloading of pressure on electrode before curing at welding point, one electrode is in position while another electrode is ...