Automatic welding method of roof cover of passenger car

Abstract

The invention discloses an automatic welding method of a roof cover of a passenger car, and belongs to the technical field of welding. The automatic welding method comprises the following steps that A, a roof cover framework is hoisted onto a mold to be located and clamped, a roof side skin and a roof middle skin are sequentially placed, and locating and fixing are carried out; B, one side of each skin is connected with a first front cross beam of the roof cover framework through CO2 discontinuous welding, the other side of each skin is clamped through a clamping device of a hydraulic tensioning mechanism, stretching is carried out, and each skin and a first rear cross beam of the roof cover framework are fixedly connected through CO2 plug welding; C, automatic welding equipment of a portal frame structure is adopted, a portal frame discontinuously moves from front to back, meanwhile, a resistance welding machine is started for spot welding, after spot welding is completed, the portal frame continuously moves to return, and meanwhile CO2 welding is started; and D, welding quality is checked, and manual repair welding is achieved. The workload on an assembly line is relieved, the requirement for large-scale production can be met, operation and control are convenient, and the production process and the product quality are guaranteed more easily.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to an automatic welding method for a passenger car roof. Background technique [0002] At present, most bus factories use manual CO on the production line 2 Gas-shielded welding, on-site welding of large and medium-sized passenger cars—top cover skin; spot welding is used between the skin and the longitudinal beams on both sides of the top inner frame after simple stretching, and full welding is used between the skin and the skin. Apply sealant after welding. The main advantages of this method are simple and flexible operation, less investment in equipment, low power consumption, and strong adaptability to different models; the disadvantages are poor welding quality, insufficient skin tension, high labor intensity for welders, and grinding work after spot welding. The volume is large and the working environment is harsh. For this reason, the bus roof of a few manufacturers has a...

AI Technical Summary

Problems solved by technology

The main advantages of this method are simple and flexible operation, less investment in equipment, low power consumption, and strong adaptability to different models; the disadvantages are poor welding quality, insufficient skin tension, high labor intensity for welders, and grinding work after spot welding. Large volume, harsh working environment

For this reason, the bus roof of a few manufacturers has achieved low-level operation and adopted resistance welding. Although the use of resistance welding is the trend of bus skin welding, compared with most bus manufacturers, single- and double-sided single-point resistance welding The large energy consumed and the large water cooling system required are still the main problems