焊接外观检查Visual inspection for MIG

1、1Technical perfection, automotive passion.Visual GMAW Weld Inspection气体保护焊的目视检查气体保护焊的目视检查GMAW: Gas Metal Arc Welding2Technical perfection, automotive passion.Adequate drawings & specifications 相应的图纸和技术规范Acceptance standards clearly understood by both manufacturer and buyer before welding is started.

2、 在开始焊接前,客供双方须清楚地明确接收标准.GENERAL PROVISIONS先期准备3Technical perfection, automotive passion.Three categories:三类工作Prior to welding 焊接前During welding 焊接中After welding 焊接后SCOPE范围4Technical perfection, automotive passion.Visual acuity 灵敏的视觉判断力Experience and Training 接受过一定的培训和相应的经验Procedures 理解程序的要求Certificat

3、ion Programs 通过了能力测试Safety 完全了解工作环境的安全要求Prerequisites for inspectors检验员的必备要求5Technical perfection, automotive passion.Generalvisual examination is a method for identifying surface flaws and imperfections 目视检查是发现焊接表面缺陷与次品的方法Fundamentals原则6Technical perfection, automotive passion.Review drawings and s

4、pecifications 审核图纸与技术规范Plan for recording of results 准备记录检查结果Review / develop control plan 审核并更新控制计划Review / develop DFMEA / PFMEA 审核并更新DFMEA / PFMEAPrior to Welding焊接前7Technical perfection, automotive passion.Sequence of welding 焊接的顺序Conformance with the applicable procedure i.e. voltage, amperage

5、and travel speed. 与相应的程序保持一致,如: 电压,电流及焊接速度During Welding焊接中8Technical perfection, automotive passion.Final weld appearance 最终焊接外观Final weld size 最终焊接尺寸Weld Length 焊接长度Location accuracy 焊接位置的精确度Distortion 变形After Welding焊接后9Technical perfection, automotive passion.Discontinuities众多缺陷Porosity气孔Incompl

6、ete fusion不完全熔接Incomplete joint penetration结合点不完全熔深Undercut咬边Overlap虚焊Cracks裂缝Burn Thru烧穿Melt back回熔Notching收弧槽Melt thru烧穿Out of position焊偏Hollow弧坑Residue表面焊渣 Weld split 断弧 FINAL WELD APPEARANCE最终焊接外观10Technical perfection, automotive passion.Widely distributed广泛分布Full length整条焊缝都有Mostly on surface表

7、面清晰可见SCATTERED POROSITY离散分布的气孔NG11Technical perfection, automotive passion.Localized group of pores一撮小气孔Starting / Stopping areas起弧收弧处Occurs during regions of arc blows气体没保护处CLUSTER POROSITY群状分布的气孔NG12Technical perfection, automotive passion.Usually contamination in joint (hydrocarbon burning) 通常由于结

8、合部有杂质LINEAR POROSITY线状分布的气孔NG13Technical perfection, automotive passion.INCOMPLETE FUSION不完全熔接Incomplete fusionNG14Technical perfection, automotive passion.INCOMPLETE JOINT PENETRATION结合点不完全熔深Incomplete joint penetrationNG15Technical perfection, automotive passion.OVERLAP虚焊OverlapNG16Technical perfe

9、ction, automotive passion.SHAM WELDING假焊NG17Technical perfection, automotive passion.OUT OF POSITION焊偏18Technical perfection, automotive passion.UNDERCUT咬边UndercutUndercut19Technical perfection, automotive passion.CRACKS裂缝NG20Technical perfection, automotive passion.MELT BACK回熔21Technical perfection

10、, automotive passion.NOTCHING收弧槽22Technical perfection, automotive passion.BURN THRU烧穿NG23Technical perfection, automotive passion.MELT THRU烧穿Melt Thru24Technical perfection, automotive passion.General Requirement 总要求25Technical perfection, automotive passion.Example1OK26Technical perfection, automo

11、tive passion.OKExample227Technical perfection, automotive passion.OKExample328Technical perfection, automotive passion.OKExample429Technical perfection, automotive passion.OKExample530Technical perfection, automotive passion.NGExample631Technical perfection, automotive passion.OKExample732Technical

12、perfection, automotive passion.NGExample833Technical perfection, automotive passion.Basic Regulation下列准则应予遵守 The scattered, linear, and cluster porosity are not acceptable 不允许出现条虫状气孔和表面气孔堆积 A single porosity is acceptable 允许有个别气孔 The incomplete fusion can not occur in the area b,b1 and b2 区域b,b1 和b2

13、不允许出现未熔合现象 In non incomplete fusion area b,b1 and b2, the penetration should be more than 0.1mm at least. 没有未熔合现象的b,b1 和b2区域内的焊接熔深至少0.1毫米 The depth of hollow should be less than 50% material thickness 弧坑深度50%板厚 The valid depth in the undercut area should be more than 0.8T and no sharp edge 出现咬边时, 实际连接深度至少0.8T, 不允许有边缘锋利的咬边.34Technical perfection, automotive passion.Principle for Rework返工原则Can be reworked:以下情况可以返工以下情况可以返工 Missed weld or Split weld 漏焊或断弧The diameter of burn thru less than