Automatic welding device and automatic welding method for thin-shell car body

Abstract

The invention discloses an automatic welding device and an automatic welding method for a thin-shell car body. The device comprises a portal-frame welding robot, elevation-type head-tail frame positioners which is arranged on the side of the welding robot, a reversing frame which is installed between the positioners and a control mechanism which is used for controlling the welding robot and the positioners to work. The method comprises the following steps of back welding a weld seam which is more than 1mm, then filling the weld seam, placing the top / left side / bottom / head / right side / tail part of a car body on a horizontal position by rotating the elevation-type head-tail frame positioner, and welding the corresponding weld seam. The automatic welding device has the beneficial effects that automatic welding of different weld seams in different forms of different car types can be satisfied, the continuous welding of a majority of weld seams outside the car body can be realized, and the production efficiency is greatly improved; by adopting the welding method, not only can the quality of the weld seam be improved, but also the welding speed is high, the heat input is small, the weld deformation is small, and the subsequent assembling can be guaranteed.

Description

technical field [0001] The invention relates to a welding device and method, in particular to an automatic welding device and method for a thin-shell car body, belonging to the field of welding technology. Background technique [0002] Some large and complex thin-shell car bodies are usually made of high-strength steel, and high-strength steel shell structures are generally assembled by welding, so the performance of welds directly provides initial boundary conditions for the service life of large shell structural components after welding. Welding seam reliability has always been the main problem plaguing the manufacture of large and complex thin-shell car bodies. [0003] The main outer weld of the car body refers to the full welding of the outer weld of the car body during the vehicle manufacturing process. At present, the automatic welding of the long straight outer weld of the car body has been realized. However, some welding seams are more complicated, and it is relati...

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Problems solved by technology

However, some welding seams are more complicated, and it is relatively difficult to realize automation. Therefore, welding wire is used for semi-automatic gas shielded welding, and some positions are still manually welded with stainless steel electrodes. The disadvantages of the above two welding methods are that they are highly dependent on welders. The proficiency of workers is required to be high, otherwise the quality of welded car body welds will be uneven, and the appearance consistency will be poor; using welding rods for welding will easily lead to waste of welding rods, which cannot be fully used

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