check the elding environment.doc

check the welding environment The welding place may encounter environmental temperature, humidity, wind, rain and other adverse conditions, check whether reliable protective measures. Appear, for example, one of the following circumstances, such as not to take appropriate protective measures, should immediately stop welding work. 1. When the arc welding is used, wind speed is equal to or greater than 8 meters per second; 2. Gas shielded welding, the wind speed is equal to or greater than 2 metres per second; 3. Relative humidity is more than 90%; 4. The low hydrogen type electrode arc welding, wind speed is equal to or greater than 5 meters per second; 5. Rain or snow. 6. When the pipe welding not cushion, pipe dangling or under external force; 7. The backing welding, welding shi environment in strong vibration or hitting condition. (6) inspection of the welding process In order to ensure welding process procedure stipulated by the proper execution of various parameters, typically increase inspection program, both by full-time or part-time quality inspector from initial welding process, to man, machine, material, method, ring and so on various factors in process inspection and monitoring, the main check assembly quality conform to the requirements of the drawings, groove surface is clean, fixture and solid welding point is reasonable, assembling clearance and wrong side is in line with the requirements, whether to consider welding shrinkage and so on. Effective check can significantly improve the welding quality and qualified rate. 13 P065 Second, in the welding test (a) welding process Welding is carried out in the welding technological requirements, including the welding method, welding material, welding specification (current, voltage, energy), welding sequence and welding deformation and temperature control. (2) the weld defects Multi-layer welding interlayer exists defects such as cracks, porosity, slag inclusion, defect is cleared. (3) the we