电渣压力焊连接（Electroslag pressure welding joint）.doc

电渣压力焊连接（Electroslag pressure welding joint） In the multi story and high-rise building, the vertical steel connection of frame column or shear wall is mostly connected by electroslag pressure welding. The construction is simple, the operation is convenient and the cost is low. However, the construction by the operation method, effect of voltage and current and other factors, often cause the quality defects of welding joints, such as axis, joint welding bag is folded, thin and large joint, the bad welding package unevenness, porosity slag, not drip phenomenon. The steel welding specification, welding package should be uniform, the prominent part of at least higher steel surface 4mm electrode and reinforced contact, no obvious burn defect, framed bent angle joints is less than 40; the joint axis deviation does not exceed 0.d (d bar diameter), and more than 2mm. In order to avoid the above shortcomings, we have taken corresponding preventive measures, the effect is better. Specific practices are as follows. Up and down axis offset The reason is that the end of the welded steel bar is distorted or the fixture is not installed properly, the steel bar is not clamped, and the clamping force is too large, resulting in the dislocation of the steel bar. The steel bar which has been clamped before welding has dislocated the upper and lower steel bars, and the fixture itself has been deformed or distorted. Preventive measures; before welding inspection of steel bar end, not straight part should be removed or corrected, mounting fixture must be correct, held under the steel concentric, upper and lower clamp can clamp clamping uniform reinforcement; reinforced after shaking is prohibited under the steel bar, in order to avoid dislocation or fixture deformation, distortion, check if the clamp and clamp fastening deformation before the operation, the fixture can not be used, the clamp should be replaced or repaired. Kink at joint The reason is that after welding, the clamp is broken