Tensile Strength · Bend Test · Nick Break · Specimen Count
Weld & Material Tensile Testing Calculator
Evaluate weld tensile coupon test results per API 1104 and API 5L. Calculate bend test requirements, nick break parameters, and specimen counts for procedure/welder qualification. Based on ASTM A370 testing methods.
Calculation Mode:
Tensile Strength
lbs
in
in
Bend Test
in
Nick Break Test
in
Specimen Count
Shared Parameters
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Complete guide to SMYS, UTS, yield strength, stress-strain curves, and API 5L material grades.
Per API 1104: Weld tensile strength must equal or exceed SMTS of the base pipe material. Failure in base metal is acceptable if strength ≥ SMTS.
Bend Test Results
Bend Radius- in
Mandrel Diameter- in
Max Defect Size- in
Acceptance: No crack or defect exceeding 1/8" (3.2mm) in any direction after bending 180°. Side bends required for t > 0.500".
Nick Break Results
Notch Depth- in
Est. Breaking Load- lbs
Visual Inspection: Fracture surface examined for complete fusion, porosity (<1/16"), and slag inclusions (<1/32" deep × 1/8" long). Max 6 defects per inch.
Specimen Count Results
Welds to Test-
Total Specimens-
Tensile Coupons-
Bend Coupons-
API 1104 Sec. 5: Procedure qualification requires 2 tensile + 4 bend specimens. Welder qualification per Sec. 6 requires 1 tensile + 2 bends.