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IS 3600:1982 Part 1 is the Indian Standard (BIS) for methods of testing of fusion welded joints and weld metal - part 1: tensile testing of butt welds. This part of the standard covers the method of transverse tensile testing of fusion welded butt joints to determine their tensile strength. It provides guidelines on specimen extraction, preparation, and the testing procedure to ensure weld joint integrity.
Specifies the method for tensile testing of fusion welded butt joints and weld metal.
ISO 4136:2023ISO (International Organization for Standardization)
HighCurrent
Destructive tests on welds in metallic materials — Transverse tensile test
Specifies the method for making a transverse tensile test on a butt weld to determine tensile strength and fracture location.
BS EN ISO 4136:2023BSI (British Standards Institution), UK
HighCurrent
Destructive tests on welds in metallic materials - Transverse tensile test
The UK's adoption of ISO 4136, making it technically identical to the international standard.
AWS B4.0:2016AWS (American Welding Society), USA
HighCurrent
Standard Methods for Mechanical Testing of Welds
Provides methods for mechanical testing, with Clause 5 specifically detailing the transverse tension test for groove welds.
ASTM A370-23ASTM International, USA
MediumCurrent
Standard Test Methods and Definitions for Mechanical Testing of Steel Products
A broader standard for steel products, but Annex A7 covers mechanical testing of welded joints, including tension tests.
Key Differences
≠IS 3600:1982 does not specify a minimum transition radius for the specimen shoulders, whereas ISO 4136:2023 mandates a radius (r) of at least 25 mm to reduce stress concentration.
≠For elongation measurement, IS 3600 specifies marking the gauge length in 25 mm intervals, an outdated practice. ISO 4136 refers to ISO 6892-1, which uses proportional gauge lengths (e.g., L₀ = 5.65√S₀) for better comparability between specimens of different sizes.
≠ISO 4136:2023 provides specific machining tolerances, stating the final thickness should not be reduced by more than 1 mm or 5% below the parent material's nominal thickness. IS 3600:1982 lacks such explicit tolerances.
≠The parallel length (Lc) of the test specimen in IS 3600 is defined as 'Width of weld + 20 mm', while in ISO 4136 it is 'Width of weld + minimum 12 mm', allowing for a potentially more compact specimen.
Key Similarities
≈The fundamental purpose is identical: to perform a transverse tensile test on a butt-welded joint to determine its tensile strength and the location of fracture.
≈Both standards mandate that the test specimen is taken perpendicular (transverse) to the weld axis, with the weld located centrally in the gauge length.
≈A core, shared requirement in both standards is the removal of weld reinforcement from both the face and root sides, machining them flush with the parent plate surface.
≈Both IS 3600 and its international equivalents require the test report to include the location of the fracture (i.e., in the parent metal, weld metal, or heat-affected zone).
Parameter Comparison
Parameter
IS Value
International
Source
Specimen Transition Radius (r)
Not specified (only shown in diagram)
≥ 25 mm
ISO 4136:2023
Specimen Width (b) for Plate ≤ 30mm
25 mm
25 mm (recommended for Type A specimen, t > 3mm)
ISO 4136:2023
Gauge Length (L₀) Definition
Marked in 25 mm intervals
Proportional, e.g., L₀ = 5.65 * sqrt(S₀) (as per ISO 6892-1)
ISO 4136:2023
Parallel Length (Lc)
Width of weld + 20 mm
Width of weld + minimum 12 mm
ISO 4136:2023
Surface Machining Tolerance
Not specified
Thickness shall not be reduced > 1 mm below nominal thickness
ISO 4136:2023
Test Piece from Pipe (Flattening)
Specimens from pipes > 50 mm OD may be flattened.
Flattening of curved specimens is permitted if nominal thickness ≤ 30 mm.
ISO 4136:2023
⚠ Verify details from original standards before use
Key Values4
Quick Reference Values
Test temperature10°C to 35°C (Ambient)
Specimen orientationTransverse to the welded joint
Weld reinforcement removalMachined flush with the parent metal
Thickness measurement accuracy± 0.01 mm
Key Formulas
Rm = Fm / So — Tensile Strength = Maximum Load / Original Cross-sectional Area
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions of Transverse Tensile Test Specimens