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What is the most significant defect to be checked while performing the visual inspection of welds?

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Question ajoutée par Mirza Aslam , QC , TECHNOMECH INTERNATIONAL
Date de publication: 2016/03/12
Diego Lara
par Diego Lara , QA/QC supervisor , FYI Engineering and Construction

The most important visual defects are the crack weldings.

Rojes Henry
par Rojes Henry , QA/QC Weldin&Piping , Applus+ Velosi Saudi Arabia

After welding, visual inspection can detect a variety of surface flaws, including cracks, porosity and unfilled craters, regardless of subsequent inspection procedures. Dimensional variances, warpage and appearance flaws, as well as weld size characteristics, can be evaluated.

Before checking for surface flaws, welds must be cleaned of slag. Shotblasting should not be done before examination, because the peening action may seal fine cracks and make them invisible. The AWS D1.1 Structural Welding Code, for example, does not allow peening "on the root or surface layer of the weld or the base metal at the edges of the weld."

Visual inspection can only locate defects in the weld surface. Specifications or applicable codes may require that the internal portion of the weld and adjoining metal zones also be examined. Nondestructive examinations may be used to determine the presence of a flaw, but they cannot measure its influence on the serviceability of the product unless they are based on a correlation between the flaw and some characteristic that affects service. Otherwise, destructive tests are the only sure way to determine weld serviceability.

ADNAN MUBARAK
par ADNAN MUBARAK , welding inspector , Thabat Construction Ltd

Undercut, surface crack, Lack of fusion.burn through.

Richard Hermosilla
par Richard Hermosilla , Pipe Fitter/ Instrument Installer , Decipak Inc.

Cracks and Discoloration Solid inclution, Rootpass,   

essam  shahin
par essam shahin , Site engineer piping , Psp

cracks -cavities-incomplet fustion-miscelinous -solid inclusion-imperfect shap

Siamak Adeli Koodehi
par Siamak Adeli Koodehi , Project Engineers , Scetiran Co

lack of fusion

incomplete pentration

Mustapha Hmaiyed
par Mustapha Hmaiyed , QC , Melloy Industrial Services Inc

porosity 

undercut

lack of fusion 

incomplete pentration

Utilisateur supprimé
par Utilisateur supprimé

Welders’ certificates, Slag cleaning, Incomplete welds

Venkateswaran Krishnamurthy
par Venkateswaran Krishnamurthy , QAQC Manager , Robtstone

Under cut,Capping defects,Slag,Creater crack,Ark stricks,under fills,porosity

Praveen Sharma
par Praveen Sharma , QA/QC Engineer- Integrity Division , Qatargas

Weld bead profile inlcuding undercuts/underfills if any, all of which could act as stress raisers, need to be primarily checked. Toes need to be smoothly blended to ensure no sudden change is there in the weld contour. These are the most basic and the most missed out aspects while performing visual inspection.

Befor welding starat compleet chek out the External Tump And weld Metal and filer Metal 

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