GB 50683-2011Code for Acceptance of Field Equipment, Industrial Pipe Welding Construction Quality (English PDF)

1.0.1 This code was formulated in order to unify the acceptance of welding

quality acceptance of field equipment and industrial pipelines and strengthen the engineering quality management.

1.0.2 This code is applicable to the construction quality acceptance of the welding engineering of the metallic materials such as carbon steel, alloy steel, aluminium and aluminium alloy, copper and copper alloy, nickel and nickel alloy, titanium and titanium alloy as well as zirconium and zirconium alloy.

1.0.3 The codes shall be applied together with "Code for Construction of Field Equipment, Industrial Pipe Welding Engineering" GB 50236.

1.0.4 The requirements for the construction quality acceptance of engineering technical document and contract agreement document shall not be less than those specified in this code.

1.0.5 Except meeting this code, the acceptance of welding engineering

construction quality shall also meet the requirements of the current relevant national standards.

2.0.2 Random sampling examination

The examination is conducted on a specific item by a certain proportion of random sampling.

2.0.3 Local sampling examination

A specific part of examination is conducted for a specific item on every piece in a specific examination batch.

3.1 Division for Acceptance of Construction Quality

3.2 Acceptance of Construction Quality

3.2.1 The quality acceptance of sub-item project shall meet the following requirements.

3.2.3 Where the welding engineering does not meet the requirements of this

code, it shall be processed according to the following requirements.

3.2.4 The weld engineering without acceptance qualification shall not be put into application

3.3 Procedure and Organization for Acceptance of Construction Quality

3.3.1 The sub-item project qualify acceptance shall be conducted based on the self-examination qualification of construction organization and quality acceptance records of sub-item project shall be filled by the project professional quality inspector of the construction organization.

4.0.1 Before the application of base metal, the examination and acceptance shall

be conducted according to the requirements of design document; the material, specification and appearance quality shall meet the requirements of the product standard and design document of base metal. The material marker shall be clear and complete and shall be traced back to the product quality certification.

4.0.2 Before the application of the welding materials, the visual quality,

proof documents, external packing and packing mark shall be examined.

4.0.3 The welding material shall be baked according to the specification before application and shall be kept dry in application process and the baking conditions shall meet the requirements of welding materials directions and relevant technical document.

5.0.1 Where nondestructive testing is required for the groove face in the design

document, magnetic particle testing or penetrant testing shall be conducted.

Groove face quality shall not be lower than Class I as specified in the current professional standard "Nondestructive Testing of Pressure Equipment" JB/T 4730.

Examination quantity. it shall meet the requirements of the design document.

5.0.3 Where the pipe butt weld is assembled, the in-wall misalignment shall

meet the requirements of Table 5.0.3.

5.0.5 Where the butt weld pieces with unequal thickness are assembled, the end surface of thin piece shall be located within that of the thick piece. Where the in-wall misalignment is greater than those specified in Articles 5.0.3 and 5.0.4 or the outer wall misalignment is greater than 3 mm, the groove dimension after processing and finishing shall meet the requirements of Figure 5.0.5.

5.0.6 The position of weld seam of weldment shall meet the requirements of the design documents and the following specifications.

5.0.7 The primary structure dimension and shape of weldment, the form and dimension of groove and the quality of the groove surface shall meet the following requirements.

5.0.8 Before welding, the cleaning quality of the groove surface and the inner

and outer surface on both sides of the groove shall meet the requirements of

Table 5.0.8.

8.1 Visual Quality Examination of Welded Seam

I Dominant items

8.2 Nondestructive Detection of Welded Seam Surface

I Dominant items

8.2.1 Magnetic particle testing or penetrant testing shall be applied on weld

surface according to the requirements of the design document. The weld surface nondestructive testing with reheating crack tendency shall be conducted after heat treatment. As for the unqualified weld seam in magnetic particle testing and penetrant testing, the specified testing method on the repair positions shall applied for re-examination. Weld quality shall not be lower than Class I as specified in the current professional standard "Nondestructive Testing of Pressure Equipment" JB/T 4730.

8.4 Other Examination

I Dominant items

8.4.1 Where the product welding examination specimen is fabricated according

to the requirements of design documents and current relevant national standard, the preparation, welding, sample preparation, mechanical property testing method and approval standard shall meet the requirements of the design document and the current professional standard "Mechanical Property Tests of Product Welded Test Coupons for Pressure Equipment" NB/T 47016.

Examination quantity.

8.4.2 Where the chemical composition analysis of weld metal, the weld seam ferrite

content determination and metallographic examination of welded joint are conducted according to requirements, the examination results shall meet the requirements of design document.