JG/T 203-2007
Method for ultrasonic testing and classification for steel structures (English Version)

Standard No.

JG/T 203-2007

Language

Chinese, Available in English version

Release Date

2007

Published By

Professional Standard - Construction Industry

Latest

JG/T 203-2007

Replace

JG/T 3034.1-1996 JG/T 3034.2-1996

Scope

This standard specifies the classification method for ultrasonic flaw detection and quality assessment using the oblique probe contact method for detecting grid steel structures and their circular pipe intersecting node welded joints and steel pipe butt welds, that is, pipe nodes. It also stipulates that building steel structures include steel roof trusses, lattice column (beam) steel components, steel frames, crane beams, welded H-shaped steel, box-shaped steel frame columns, beams, welded composite components and steel in trusses or frame beams. A method of using ultrasonic flaw detection on building structures, that is, plate joints, and grading quality based on the results of ultrasonic flaw detection. This standard is applicable to welded hollow ball and ball tube welding joints with base metal wall thickness not less than 4mm, ball diameter not less than 120mm, and pipe diameter not less than 60mm; base metal wall thickness not less than 3.5mm, pipe diameter not less than 48mm bolt ball joint rod The welded joint between the parts and the cone head or sealing plate; the branch pipe diameter is not less than 89mm, the wall thickness is not less than 6mm, the local dihedral angle is not less than 30°, and the branch pipe wall thickness to outer diameter ratio is less than 13% of the round pipe intersecting node carbon Ultrasonic flaw detection and quality classification of welded joints of plain structural steel and low-alloy high-strength structural steel. It is also suitable for the detection of steel castings, austenitic tubes and intersecting node welding joints, as well as round pipe butt joints or welded pipe welds. This standard also applies to steel plate butt full penetration joints of carbon structural steel and low alloy high-strength structural steel with a base metal thickness of not less than 4 mm, electroslag welding joints of box-shaped components, T-shaped joints, lap corner joints, etc. Ultrasonic testing of joints, plates, forgings, and steel castings used in steel structures. It is also suitable for the detection of square rectangular pipe joints, underground building structure steel pipe piles, welded joints of pre-tensioned prestressed pipe pile end plates, as well as the detection of circular joints with a curvature radius of not less than 100Omm and longitudinal joints with a curvature radius of not less than 150Omm in plate and shell structures. . The ultrasonic flaw detection of welded joints of bridge projects and hydraulic metal structures and the quality classification of the results can also be implemented with reference.

JG/T 203-2007 Referenced Document

• GB 50202 Standard for acceptance of construction quality of building foundation*， 2018-03-16 Update
• GB 50205 Code for acceptance of construction quality of steel structures*， 2020-01-23 Update
• GB/T 11345-1989 Method for manual ultrasonic testing and classification of testing results for ferritic steel welds
• GB/T 12604.1 Non-destructive testing—Terminology—Ultrasonic testing*， 2020-11-19 Update
• GB/T 7233-1987 Methods for ultrasonic testing and for specifying quality levels of steel castings
• JB/T 10062 Testing methods for performance of probes used in ultrasonic flaw detection
• JB/T 10063 Specification for No.1 standard test block used in ultrasonic flaw detection
• JB/T 9214 Non-destructive testing.Test methods for evaluating performance characteristics of A-scan pulse-echo ultrasonic testing systems*， 2010-02-11 Update
• JGJ 81-2002 Technical specification for welding of steel structure building

JG/T 203-2007 history

• 2007 JG/T 203-2007 Method for ultrasonic testing and classification for steel structures
• 1996 JG/T 3034.2-1996 Methods for ultrasonic testing and classification of welds for steel space grid structures with bolted joints

JG/T 203-2007 Method for ultrasonic testing and classification for steel structures has been changed from JG/T 3034.1-1996 Methods for ultrasonic testing and classification of welds for steel space grid structures with welded joints.

JG/T 203-2007 Method for ultrasonic testing and classification for steel structures has been changed from JG/T 3034.2-1996 Methods for ultrasonic testing and classification of welds for steel space grid structures with bolted joints.