INTRODUCTION
Rationale
Inspection is traditionally considered a post-processingactivity. A machine component may be turned to finished form andsize—then inspected for conformance to the applicable drawing orspecification. A garment is inspected after sewing and all thebuttons and other features are in place. In these and similarinstances, visual inspection is carried out after theproduction activities have been completed.
In the case of weldments, experience has shown thatpost-processing inspection, even when supplemented withnondestructive examination (NDE), gives no guarantee of suitabilityfor intended service. However, consistent results over aconsiderable period of time have demonstrated the effectiveness ofa preplanned sequence of visual inspections. If carried out atspecific stages of weldment production, such programs give a highdegree of assurance of meeting quality expectations—frequentlywithout recourse to NDE.
With welding, the factors influencing quality may manifestthemselves at any stage of the production operation. In manyinstances, quality is compromised even before welding commences. Inmost such circumstances, suitably timed visual inspection wouldhave revealed the shortcoming at a stage when corrective actionwould be simple to implement and inexpensive to carry out.
Weld and weldment quality are determined by:
• Weldment and joint design
• Materials used in construction
• Welding procedures
• Manner of weld application
• Inspection program
Visual welding inspection provides the basis for the effectivecontrol of these determinants.
- Edition:
- 4
- Published:
- 01/01/2008
- Number of Pages:
- 132
- File Size:
- 1 file , 13 MB
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