1.2.1 T-joints, cross-joints, corner joints, etc., which require penetration and angle butt joint welds, shall have a weld foot size not less than t/4 (Fig. 1.2.1a, b, c); The welding feet of the webs of the crane beam or the like and the upper flange of the crane girder are required to be t/2 (Fig. 1.2.1d) and should not be less than 10 mm. The allowable deviation of the solder fillet size is 0-4 mm. Inspection quantity: all data inspection; 10% of similar welds are checked, and should not be less than 3. Inspection method: observation inspection, spot check with weld gauge. 1.2.6 There shall be no defects such as cracks or welds on the surface of the weld. The primary and secondary welds shall not have defects such as surface pores, slag inclusions, crater cracks, and arc scratches. And the first-grade welds are not allowed to have undercuts, insufficient welds, and root shrinkage. Quantity of inspection: 10% of each batch of similar components shall be inspected, and shall not be less than 3 pieces; in the parts to be inspected, 1% of each type of weld shall be inspected according to the number of strips, and shall not be less than 1; one inspection per inspection, The total number of random checks should not be less than 10. Inspection method: Observe or use magnifying glass, weld quantity regulations and steel rule inspection. When there is doubt, use infiltration or magnetic particle inspection. II general project 1.2.7 For welds that require pre-weld preheating or post-weld heat treatment, the preheating temperature or post-heating temperature shall be determined by the relevant national standards or by process test. The preheating zone shall be on both sides of the bead, and the width of each side shall be more than 1.1 times of the thickness of the weldment and shall not be less than 100 mm; the post heat treatment shall be carried out immediately after the welding, and the holding time shall be according to the thickness of the plate according to the thickness of each 21 mm. Thickness is 1h. Number of inspections: full inspection. Inspection method: Check pre- and post-heat construction records and process test reports. 1.2.8 The quality standards for secondary and tertiary welds shall comply with the requirements of Table A.0.1 of Appendix A of this code. The third-level butt joints shall be inspected for appearance quality in accordance with the secondary weld standard. Quantity of inspection: 10% of each batch of similar components shall be inspected, and shall not be less than 3 pieces; in the parts to be inspected, 1% of each type of weld shall be inspected according to the number of strips, and shall not be less than 1; one inspection per inspection, The total number of random checks should not be less than 10. Inspection method: observation inspection or inspection using a magnifying glass, weld gauge and steel ruler. 1.2.9 Allowable deviation of weld size shall comply with the provisions of Table A.0.2 of Appendix A of this code. Inspection quantity: 10% of each batch of similar components shall be inspected, and shall not be less than 3 pieces; in the sampled parts, each weld shall be inspected by 1%, but not less than one; each inspection shall be The total number of random checks should not be less than 10. Inspection method: Check with weld gauge. 1.2.10 Welded concave fillet welds shall be gently transitioned between weld metal and base metal; fillet welds that are machined into a concave shape shall not leave cut marks on the surface. Inspection quantity: 10% of each batch of similar components, and not less than 3 pieces. Inspection method: observation inspection. 1.2.11 Weld feel should be achieved: uniform shape, good forming, smooth transition between weld bead and weld bead, weld bead and basic metal, and weld slag and spatter are basically cleaned. Inspection quantity: 10% of each batch of similar components should be checked, and should not be less than 3 pieces; in the sampled parts, each weld should be checked by 1% according to the quantity, and the total spot check should not be less than one place. Inspection method: observation inspection. 1.3 welding nail (stud) welding engineering I master project 1.3.1 The construction unit shall carry out the welding procedure qualification for the welding of the welding nails and steel used, and the results shall comply with the design requirements and the relevant national standards. Porcelain rings should be baked according to their product specifications. Number of inspections: full inspection. Inspection method: Check the welding process evaluation report and baking record. Note: 1.3.1 Because of the direct influence of the composition of the steel and the welding quality of the welding nail, the welding procedure qualification test must be carried out according to the steel used in the actual construction and the welding nail. When the porcelain ring is damp or the product is required to be dried, it should be dried as required to ensure the quality of the welded joint. 1.3.2 After the welding of the nails, the bending test shall be carried out, and the welds and heat-affected areas shall have no visible cracks. Inspection quantity: 10% of each batch of similar components should be inspected, and should not be less than 10 pieces; among the parts to be inspected, each piece should check 1% of the number of welding nails, but should not be less than one. Inspection method: After the nail is bent for 30o, it is inspected by a square rule and observed. II general project 1.3.3 The welding feet of the root of the welding nail should be uniform, and the welding feet of the welding foot façade that are not fused or less than 360o should be repaired. Inspection quantity: 1% of the total number of welding nails, and should not be less than 10. Inspection method: observation inspection. 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