Multilayer and multipass welding track planning method for variable-groove-width heavy and medium plates

Abstract

The invention discloses a multilayer and multipass welding track planning method for variable-groove-width heavy and medium plates. A line laser sensor is used for carrying out groove scanning and measuring on variable-groove-width heavy and medium plate welding parts; variable groove information is collected according to certain sampling frequency; then key information extraction and data processing are carried out on collected grooves, a variable groove center curve is finished, and irregularly-discrete variable groove data points are fitted into multiple linearly-continuous line segments; and finally according to multilayer and multipass welding parameters of the heavy and medium plates, the variable groove center curve and the fitted multi-line-segment groove data are combined, and multilayer and multipass welding track planning of the variable-groove-width heavy and medium plates is completed. The method can be used for welding track planning of variable-groove-width welding parts and is simple, good universality and high practicality are achieved, and good application prospects are achieved.

Description

technical field [0001] The invention relates to a welding method, in particular to a multi-layer and multi-pass welding track planning method with variable groove width for medium and thick plate welding. Background technique [0002] According to the thickness of the welded workpiece, the weldment can be divided into thin plate, medium plate and thick plate. In general, thin plates refer to weldments with a thickness of ≦4.5mm, medium plates refer to weldments with a thickness between 4.5 and 20mm, and thick plates refer to workpieces with a thickness greater than 20mm. Medium plate and thick plate are collectively referred to as medium plate. [0003] Because the thickness of medium and heavy plate workpieces is relatively thick, multi-layer and multi-pass welding methods are generally used for welding. like figure 1 The V-groove of the medium and thick plate shown adopts the welding method of 4 layers and 10 passes. The situation where the groove width varies unevenly...

AI Technical Summary

Problems solved by technology

This is mainly caused by two situations: one is caused by the groove processing error; because some weldments are manually cut by acetylene flame when processing the groove, it is easy to cause the appearance of variable groove

Second, in the process of multi-layer and multi-pass welding of medium and thick plates, due to the existence of welding thermal deformation, after welding one or two layers, the position of the groove often shifts or the shape of the groove is distorted, resulting in welding deviation, unwelded Occurrence of penetration or burn-through problems, which will adversely affect welding quality

[0007] The above-mentioned prior patents all realize automatic multi-layer and multi-pass welding by adjusting the position or angle of the welding torch online in real time, or by correcting the track of the welding bead in real time. This method of real-time adjustment or planning in the welding process has slow response and general Weakness and other shortcomings need to be improved

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