Weld Quality Test 2

Front 1

Welding inspectors; qualified through two

organizations.

Back 1

American welding society (AWS)- Certified welding inspector (CWI)

• 5 years with 6 hour test.
• Must be renewed every 5 years and re examined every 9 years.

American society for non-destructive testing (ASNDT)- level 1,2,3.

• Renewed every 5 yrs and examine every 10.

Front 2

Need for inspection

Back 2

1. Ethics
2. Skill level
3. Process, materials, and variables
4. Alol codes require visual inspection of completed welds.
5. Most contract document require in-process inspectors and NDT.

Front 3

Classifications of inspection/testing

Back 3

• Destructive testing
• Non destructive testing (NDT, NDE, OR NDI)

Front 4

Destructive testing

Back 4

Methods of inspecting the metal and welds hat destroys the usefulness of the product.

• Provides valuable info about the physical and mechanical properties/characteristics of the weld, heat affected zone, and base metal.

Front 5

Non-destructive testing

Back 5

Inspection process that doesn't compromise the usefulness of the part.

• External and internal defects can be detected.

Front 6

Types of NDT

Back 6

• Visual testing (VT)
• Penetrant testing (PT)
• Magnetic partical testing (MT)
• Eddy current testing (ECT)
• Leak testing (LT)
• Radiography testing (RT)
• Ultrasonic testing (UT)

Front 7

Visual testing

Back 7

• Most commonly applied NDT
• If applied consistently- most valuable NDT.
• First step in all welding inspection.
• When properly applied, VT can detect ~75% of the defects found by other NDT methods.
• Must be applied before, during, and after welding.
• Cheap compared to other methods, requires education, experience, and is open to judgement calls.
• Must have own criteria.
• Surface discontinuities only.

Front 8

Equipment for VT

Back 8

• Scales
• Lights
• Magnifying
• Micrometers
• Calipers
• Squares
• Depth Gage's
• Scoopes
• WELD GAGES

Front 9

VT process control- prior to start up

Back 9

• Review project drawings and specifications
• Check procedures and qualifications
• Establish record keeping

Front 10

VT process control- Prior to welding

Back 10

• Check base metal
• Check joint fit-up
• Check preheat requirements
• All these factors effect the finished weld

Front 11

VT process control- During welding

Back 11

• Root pass (most critical weld)
• Back grinding/back gouging
• Interclass temp
• Cleaning between passes
• Conformance to procedure

Front 12

VT process control- After welding

Back 12

• Final inspection: immediate or delayed
• Must be measured, discont. evaluated and results recorded.
• Defects have to be addressed and repaired
• Verify dimensional accuracy of finished part