Quality assurance measures for steel structure fabrication
1 the structure of the steel must have factory certification and original data, and into the factory can be used by the steel must be re qualified back.
2 choose the good performance, the use of functional requirements of processing equipment, factory production H steel flange plate with a single 45 degree groove butt, web with a single 45 degree miter groove.
3 the welding rod shall have the factory certificate or material report, and the welding rod shall be dried before use, and the welding wire and flux used in submerged arc welding must be matched with the base material used.
4 the steel component production after the completion of blasting and derusting requirements within 24 hours after the painted primer, primer spraying brush, paint film thickness requirements that meet the design requirements.
5 all personnel must be in strict accordance with the technical, quality, safety tests, content execution, welding personnel must be certified.
6 the steel structure of the requirements of the welded butt welds shall be used for ultrasonic testing, detection level of two.
7 structure to improve the accuracy of hole drilling hole. The drill is made of medium carbon steel, it is necessary to carry out quenching treatment, the bore diameter of the drilling die should be larger than the design aperture 0.3mm, the thickness of the drilling die should not be too large, generally about 15mm.
8 in order to ensure the accuracy of the manufacturing of steel material to pre shrinkage, pre volume as the workpiece dimensions, general workpiece in 40-60mm, the important big long to put 80-100mm.
9 to develop a reasonable welding sequence is not necessary, when a number of welding to be welded, the welding should be welded to the larger deformation of the joint, and then the welding longitudinal weld, or the first welding butt weld and then weld angle weld.
10 welding type steel main weld should be welded before assembling the stiffening rib plate parts. The welding sequence of the main weld should be considered according to the welding deformation.
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