Automatic device in transverse direction for tracking welding line by floatation force of welding-torch

Abstract

An automatic transverse weld tracking apparatus for welding torch is composed of a welding carriage with a guide rod on which the welding torch moves transversely, a slide sleeve on said guide rod, a welding torch with a base connected to said slide sleeve and rotary relatively to the slide sleeve and a welding wire outlet, and the front and back force couple bodies with elastic detecting rollers for making the welding wire always on the central line of two bevel surfaces to be welded.

Description

technical field [0001] The invention relates to a welding seam horizontal automatic tracking device driven by a floating elastic force of a welding torch, which is a contact type welding seam lateral self-adaptive automatic tracking device and belongs to the field of welding technology. Background technique [0002] Since the welding technology began to be applied on a large scale in the industrial field in the 1930s, it has roughly experienced the following technological developments: 1. The period of the invention of traditional welding methods (from the early 1930s to the mid-1950s). 2. The perfection of traditional welding methods and the invention of special welding methods (from the mid-1950s to the 1970s). During this period, arc physics and welding metallurgy and other technologies The basic theory is becoming more and more systematic and perfect. On the one hand, the traditional arc welding technology has begun to develop rapidly in the direction of high productivit...

AI Technical Summary

Problems solved by technology

The above-mentioned technologies have their own advantages, but they all have the following limitations: 1. There is a sensor leading (or lagging) error (transverse tracking accuracy error caused by the sensor not being able to coincide with the center of the welding torch, except for the arc sensing type); 2. The size of the additional sensor is large, which increases the volume and weight of the welding torch, and it is difficult to apply in the occasion where the sensor size is strictly limited; 3. The extraction of the deviation signal generally comes from the surface of the workpiece and the intersection edge between the groove surface and the upper surface edge, and the inhomogeneity deviation information of the groove surface relative to the workpiece surface and edge will be difficult to extract, which will bring a certain system error; 4. This type of tracking system generally has poor anti-interference ability (especially poor anti-electromagnetic field interference) ;5. The tracking system is complex and must be composed of sensors, closed-loop automatic control systems (including hardware and software) and actuators, and the system reliability is relatively low.

This type of tracking technology has the longest application history. Disturbing factors such as arc light, electromagnetic field, smoke and metal vapor, welding spatter, high temperature, workpiece surface state and edge state have little influence on the tracking accuracy, but there are still the following limitations: 1. Tracking The accuracy is low; 2. It is difficult to overcome the obstacles of spot-solid solder joints in the weld; 3. The roughness and surface damage of the groove and weld surface directly affect the stability of the tracking system; 4. There is a leading tracking error; 5. It is usually only suitable for V-shaped, double V-shaped and Y-shaped grooves with large groove face angles, and it is difficult to apply under extremely small groove face angles (β≤2°).

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