焊接外觀檢查Visual inspection for MIG

VisualGMAWWeldInspection

氣體保護焊的目視檢查GMAW:GasMetalArcWeldingAdequatedrawings&specifications相應的圖紙和技術規(guī)范Acceptancestandardsclearlyunderstoodbybothmanufacturerandbuyerbeforeweldingisstarted.在開始焊接前,客供雙方須清楚地明確接收標準.GENERALPROVISIONS

先期準備Threecategories:三類工作Priortowelding焊接前Duringwelding焊接中Afterwelding焊接后SCOPE

范圍Visualacuity靈敏的視覺判斷力ExperienceandTraining

接受過一定的培訓和相應的經驗Procedures理解程序的要求CertificationPrograms

通過了能力測試Safety

完全了解工作環(huán)境的安全要求Prerequisitesforinspectors

檢驗員的必備要求Generalvisualexaminationisamethodforidentifyingsurfaceflawsandimperfections目視檢查是發(fā)現焊接表面缺陷與次品的方法Fundamentals

原則Reviewdrawingsandspecifications審核圖紙與技術規(guī)范Planforrecordingofresults準備記錄檢查結果Review/developcontrolplan

審核并更新控制計劃Review/developDFMEA/PFMEA審核并更新DFMEA/PFMEAPriortoWelding

焊接前Sequenceofwelding焊接的順序Conformancewiththeapplicableprocedurei.e.voltage,amperageandtravelspeed.

與相應的程序保持一致,如:電壓,電流及焊接速度DuringWelding

焊接中Finalweldappearance最終焊接外觀Finalweldsize最終焊接尺寸WeldLength焊接長度Locationaccuracy

焊接位置的精確度Distortion

變形AfterWelding

焊接后Discontinuities眾多缺陷Porosity氣孔Incompletefusion不完全熔接Incompletejointpenetration結合點不完全熔深Undercut咬邊Overlap虛焊Cracks裂縫BurnThru燒穿Meltback回熔Notching收弧槽Meltthru燒穿Outofposition焊偏Hollow弧坑Residue表面焊渣

Weldsplit斷弧

FINALWELDAPPEARANCE

最終焊接外觀Widelydistributed廣泛分布Fulllength整條焊縫都有Mostlyonsurface表面清晰可見SCATTEREDPOROSITY

離散分布的氣孔NGLocalizedgroupofpores一撮小氣孔Starting/Stoppingareas起弧收弧處Occursduringregionsofarcblows氣體沒保護處CLUSTERPOROSITY

群狀分布的氣孔NGUsuallycontaminationinjoint(hydrocarbonburning)通常由于結合部有雜質LINEARPOROSITY

線狀分布的氣孔NGINCOMPLETEFUSION不完全熔接Incomplete

fusionNGINCOMPLETEJOINTPENETRATION結合點不完全熔深IncompletejointpenetrationNGOVERLAP虛焊OverlapNGSHAMWELDING假焊NGOUTOFPOSITION焊偏UNDERCUT咬邊UndercutUndercutCRACKS裂縫NGMELTBACK回熔NOTCHING收弧槽BURNTHRU燒穿NGMELTTHRU燒穿MeltThruGeneralRequirement總要求Example1OKOKExample2OKExample3OKExample4OKExample5NGExample6OKExample7NGExample8BasicRegulation下列準則應予遵守Thescattered,linear,andclusterporosityarenotacceptable不允許出現條蟲狀氣孔和表面氣孔堆積Asingleporosityisacceptable

允許有個別氣孔

Theincompletefusioncannotoccurintheareab,b1andb2

區(qū)域b,b1和b2不允許出現未熔合現象

Innonincompletefusionareab,b1andb2,thepenetrationshouldbemorethan0.1mmatleast.

沒有未熔合現象的b,b1和b2區(qū)域內的焊接熔深至少0.1毫米Thedepthofhollowshouldbelessthan50%materialthickness

弧坑深度<50%板厚

Thevaliddepthintheundercutareashouldbemorethan0.8Tandnosharpedge出現咬邊時,實際連接深度至少0.8T,不允許有邊緣鋒利的咬邊.PrincipleforRework返工原則Canbereworked:以下情況可以返工

MissedweldorSplitweld漏焊或斷弧Thediameterofburnthrulessthan5mm

焊穿直徑小于5mmShortle