A Mechanical Welding Deformation Measuring Device and a Method for Optimizing the Welding Process of a Bus Frame Joint

Abstract

The invention discloses a mechanical welding deformation measuring apparatus and a carriage frame joint welding technology optimization method. The measuring apparatus comprises a work platform, and two concave seats are symmetrically fixed on the work platform; a compression device is respectively connected with the two concave seats; a gauge stand support is arranged on the work platform; and a group of measuring instruments are fixed on the gauge stand support. The optimization method comprises: first of all, measuring the welding deformation of a welding joint; then processing measuring data to obtain the deformation amount of a loading section; establishing a whole-carriage beam unit model; and repeatedly executing the above steps on joints with different specifications in a carriage to obtain the welding deformation stress of the joints with the different specifications for storing in a database. The apparatus is simple in structure, convenient to operate, low in cost and high in precision, and can measure the bending and torsional deformation which are generated by the carriage frame joints in different forms during a welding process. The method can provide data support for optimal signal of a carriage structure, and provides an effective evaluation method for selection of a carriage joint welding technology.

Description

technical field [0001] The invention relates to a welding deformation measuring device, more precisely, to a mechanical welding deformation measuring device and a method for optimizing the welding process of a passenger car skeleton joint based on the device. Background technique [0002] During the welding process, the thermal expansion and contraction of the weld metal causes residual deformation of the workpiece after welding. Traditional welding deformation measurement methods, such as sticking strain gauges on the workpiece, have low measurement accuracy; however, the measurement devices of optical interferometry, photoelectric deformation measurement method, and widely used fixed-point repeated measurement method are relatively complicated, which are difficult for measurement. The environmental requirements are strict, the measurement cost is high and the operation is cumbersome, so it is not suitable for batch measurement in actual engineering. [0003] Different fro...

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Problems solved by technology

[0004] At present, when designing the bus body structure, due to the lack of evaluation methods for welding deformation stress under different welding processes, designers often ignore the influence of welding deformation stress on the structural strength at joints, and instead increase the cross-sectional size of the bar and increase the welding angle To improve the local strength of the joints, it will increase the manufacturing cost and is not conducive to the lightweight design of the bus frame

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