1. Material inspection items

1.1 Material certification shall be reviewed in accordance with drawings and material specifications

1.2 Confirmation and verification of material specifications and dimensions with flange gasket surface

Check according to drawing and material specification standards

1.3 Material labeling confirmation and verification can be traced back to the manufacturer's material certification in accordance with the drawing and material specification standards

1.4 Incoming material inspection, PMI chemical test and warehouse material confirmation and check are in accordance with drawings and material specifications

1.5 The batch number of the furnace shall be traced back and verified in accordance with the manufacturer's operating standards in the process of material manufacturing

1.6 Material inspection report and material list shall be reviewed according to the drawing

2. Cutting inspection items

2.1 Dimensions are measured according to the drawings

2.2 Slotting dimensions are measured according to the drawing and welding procedure

2.3 The batch number of the material furnace is transferred according to the manufacturer's operating standards

3 rolls plate and molding

3.1 Check the size and roundness of the rewinding plate according to the drawing and manufacturing standard

3.2 The thickness and appearance of the coil shall be checked according to the drawing and manufacturing standard

4. Spot welding (before welding) inspection items

4.1 Smooth slotting surface, no foreign bodies, cleaning and centering inspection shall be carried out according to welding standards

4.2 The base metal in 25mm beside the weld shall be clean and free of foreign matter according to the welding standards

4.3 Qualification of welding personnel shall be reviewed according to welding standards

4.4 Welding procedure shall be confirmed in accordance with welding standards

4.5 Welding materials shall be confirmed in accordance with welding procedures

4.6 Welding conditions shall be confirmed in accordance with welding procedures

4.7 The appearance of spot welding parts shall be inspected according to the welding standards

Inspection items in welding

5.1. Verify that the welding conditions are in accordance with the welding procedures

5.2 Qualification of welding personnel shall be checked according to welding standards

5.3 Welding materials are used correctly according to welding standards

5.4 Cleaning between welding layers and appearance inspection of defects shall be conducted in accordance with welding standards

Check the project after welding

6.1 The residual height after welding shall be checked according to the acceptance standard

6.2 The appearance inspection and size inspection of welds shall be in accordance with the accepted standards

7. Open hole

7.1 Check and confirm the opening position according to the drawing

Pipe installation and welding