钢筋气压焊工艺标准(413-1996)（Technical standard for air pressure welding of steel bar (413-1996)）.doc

钢筋气压焊工艺标准(413-1996)（Technical standard for air pressure welding of steel bar (413-1996)） Technical standard for air pressure welding of steel bar (413-1996) Range The process standard is applicable to the butt joint of vertical and horizontal or inclined positions of reinforced concrete structures of 14 ~ 40mm diameter in the cast-in-place reinforced concrete structures in industrial and civil buildings. When two steel bars are not of the same diameter, they can also be welded by air pressure welding, but the difference between the two diameters shall not exceed 7mm. Construction preparation 2.1 materials and main equipment; 2.1.1 reinforcement: the grade and diameter of the reinforcement must comply with the design requirements. There is a factory certificate and a re examination report. There shall also be chemical re examination sheets for the imported steel bars. The chemical composition shall meet the requirements of welding and shall be tested for weldability. 2.1.2 oxygen (O2): air pressure welding using oxygen purity should be more than 99.5%, the quality conforms to the GB3863 class I or class II technical requirements. 2.1.3 acetylene gas (C2H2): it is better to dissolve acetylene in bottles, and the quality should meet the requirements of GB6819. Its purity must be more than 98%, phosphine content shall not be greater than 0.06%, hydrogen sulfide content shall not be greater than 0. l%, moisture content shall not be greater than 1L/m3, acetone content should be no more than 45g/m3. Such as the use of acetylene generator direct production of calcium carbide, quality of use should be in conformity with the relevant provisions of the standard grade or grade requirements. 2.1.4 main tools: 2.1.4.1 gas supply equipment shall include oxygen bottles, dissolved acetylene cylinders (or medium pressure acetylene generator), dry tempering preventer, reducer and hose, etc.. The use of oxygen bottles and dissolved acetylene cylinders shall be carried out in accordance