屋面钢结构焊接、吊装技术交底（Roof steel structure welding and lifting technical disclosure）.docVIP

屋面钢结构焊接、吊装技术交底（Roof steel structure welding and lifting technical disclosure） Note of technical disclosure (form C2-2-1) number T3-3 One Construction name **1 - 3 block construction unit, Beijing * two steel structural branch company May 10, 2005 Summary: roof steel structure welding technical disclosure Disclosure content: steel structure installation welding technical disclosure I. construction preparation: 1. construction materials and machines: 1) welding material: E4303. Storage: should be placed in a dry, well ventilated warehouse (room temperature not less than 18C0, relatively wet) It is less than 50%) and placed away from the ground and wall at least 300mm, so as to prevent moisture from deterioration. Drying: drying temperature is 200 degrees, heat preservation 1-1.5 hours, after drying the electrode is best put into the storage box, so as to use with. Welders The welding rod is put in the heat preservation barrel. Two times drying electrode temperature of 200 degrees, time is 1 hours, and do the welding rod Drying record. Welding rod approach must have certificate, according to instructions for baking. Prohibit the use of damp, skin peeling And the electrode welding core rust. 2) machine: AC arc welding machine, oven, thermostat, grinding machine, heat preservation cylinder, goggles, angle grinder, wire brush, Small hammer, flat shovel and so on Two, construction process 1. welding current selection: Phi 3.2mm 100A~130A Phi 4mm 160A~210A; 2. welding speed: about 15cm/min; 3. assembly conditions: 100mm on both sides of weld seam, grease and rust should be cleaned up; weld gap is 6-8mm; 4. welding, vertical welding and overhead welding using multi-layer single pass welding method, horizontal welding using multi pass welding method. The location of each lane Have a good grasp of it. The bottom bead of groove shall be welded by welding electrode of no more than 3.2mm, so as to facilitate welding penetration; 5. welding in strict accordance with the welding se