The construction acceptance specification requires that the electric welder must pass the examination and obtain the certificate, and the certified electric welder must perform welding within the scope of the new project passing the examination and the approval.

The used welding wire, flux, flux-cored welding wire and melting tip must be baked and stored according to the requirements of the product manual and welding method document before use.

Construction enterprises should carry out welding method identification for the stainless steel plates, welding consumables, welding process, post-weld heat treatment, etc. they choose for the first time and clarify the welding method according to the evaluation report.

Ultrasonic flaw detection shall be carried out for the first and second welds with full penetration and internal defect detection shall be carried out. When the ultrasonic flaw detector cannot distinguish the defects, non-destructive testing should be used.

It is stipulated that there should be no cracks, welding scars and other defects on the surface of the weld. The primary and secondary welds shall not have defects such as superficial blowholes, arc crater cracks, and electric arc scratches. And the first-level weld should not have defects such as wrong opening, incomplete welding, and gathering at the root. The total number of inspections shall be 10% and no less than 3 samples of similar prefabricated components each time. Check with observation or use high-power magnifying glass, weld caliper and steel tape to check. When in doubt, use infiltration or magnetic particle inspection.

The welding seam magnetic induction makes the appearance design uniform, the shape is good, the connection between the welding seam and the welding seam, the welding seam and the basic metal material is relatively smooth, and the welding scar and spatter are basically eliminated and neat.

In addition to welding in steel structure engineering construction, tightening and connection engineering projects are also critical. Such as general bolts, torsional shear type high-strength bolts, high-toughness hexagonal head bolts, spherical grid bolt balls, high-strength bolts and nail-shooting bullets for connection points, self-tapping screws, blind rivets and other connection projects. When general bolts are used as permanent connection bolts, when the design plan requires or there is doubt about the quality, the minimum tensile load re-inspection of the bolt entity should be carried out, and 8 samples of each specification and model should be sampled. The bolts should be tightened firmly, and the exposed wires should not be less than 2 buckles.

The anti-movement index test and re-inspection of the friction surface of the high-strength bolted connection shall be carried out according to the standard requirements for the installation of high-strength bolted connections. The high-strength bolt connection pair is finally screwed within 1 hour to 48 hours. Carry out the final torque inspection, sample inspection 10% not less than 10, the exposed wire openings are 2-3 buckles, and 10% of the wire openings are allowed, with 1 buckle or 4 buckles.

The friction surface of high-strength bolt connection should always be kept dry, clean and tidy, and there should be no burrs, burrs, welding spatter, welding slag, zinc ash stains, etc. The friction surface should not be painted except as specified in the design plan.

In particular, it must be emphasized that high-strength bolts should be freely inserted into the bolt holes, and oxygen cutting and reaming should not be used. When reaming, the total number of reaming holes must be allowed by the design department. The diameter after reaming should not exceed 1.2d (d is the diameter of the bolt)