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welding joint process of steel space frame

The weld surface shall not have cracks or defects. The primary and secondary welds shall not have surface pores, slag clips, arc pit cracks, arc abrasion and other defects. And the first grade weld shall not have bite, not full, root shrinkage and other defects. Inspection quantity: 10% of similar components shall be inspected, and not less than 3; of inspected components, each type of weld shall be inspected 5% by the number of pieces, and not less than 1; the total spot check shall not be less than 10.Inspection method: observe or use magnifying glass, weld gauge and steel gauge, with penetration or magnetic particle test.


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The welding connection material should be matched with the base metal. When two different steel grades are welded, the electrode or wire that matches the lower strength steel grade is used. Welded connections with direct dynamic load or important thick plate welding should use low-hydrogen electrodes, such as E4315, E4316, E5015, E5016 and other models.Fire retardant coatings must be products that have passed the test of the national testing agency and have been approved by the fire department, and must be matched with the primer. The performance, coating thickness and quality requirements of the selected fire retardant coatings should comply with the current national standard "Fireproof Coatings for Steel Structures" (GB14907-2018) and the current national standard "Application Technology of Fireproof Coatings for Steel Structures" (CECS24-2020).

The welding seam quality inspection of the space frames should meet the secondary standard requirements specified in the <<Steel Structure Engineering Construction Quality Acceptance Standards>> (GB50205-2020). The quality level of the weld shall comply with the current national standard “Code for Welding of Steel Structures” GB 50661 The inspection method shall comply with the current national standard “Code for Acceptance of Construction Quality of Steel Structure Engineering” GB 50205. For butt welds with a thickness of less than 6mm, ultrasonic flaw detection shall not be used to determine the weld quality grade.6. When the steel pipe and the sealing plate and the cone head form a rod, the butt welds at both ends are full penetration welds.

 

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