JPH01148473A - Narrow gap welding equipment using high speed rotating arc - Google Patents

Abstract

PURPOSE:To obtain sufficient centrifugal force and to execute depositing by providing the flat chip and flat nozzle of specified shape on a rotary torch and taking the structure of the rotary torch having a movement fulcrum between the flat chip tip and a revolving action power point. CONSTITUTION:A welding head 1 supports a rotary torch 3 by drooping it at specified inclining angle via a rotating mechanism 2 and flat nozzle 4 and flat chip 5 are provided at the torch 3 lower part. The flat chip 5 has a flat cross sectional shape of the dimension W in a groove width direction being smaller than those of welding progressing direction and the flat nozzle 4 also has similar flat cross sectional shape. When a revolving action is performed by rotating the torch 3 upper part not co-axially around a shaft center 7 by the rotating mechanism 2 by the structure like this, the torch 3 is crossed with the rotary shaft center 7 at the nozzle 4 part and this intersection 8 becomes the fulcrum of the revolving action of the torch 3. This fulcrum 8 is located at the lower part then the driving power point by the rotating mechanism 2 of the torch 3, and the tip of the chip 5 is eccentrically rotated at sufficient inclination, hence the deposition of the groove side wall can be executed under the action of sufficient centrifugal force.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a rotating arc created by the eccentric rotational movement of a torch while moving the torch in the direction of the groove line in a narrow groove sandwiched between base material wall surfaces on both sides. By Meat J! This invention relates to a high-speed rotating arc narrow gap welding device for welding.

[Conventional technology]

High-speed rotating arc welding, in which welding is performed while rotating an arc eccentrically at high speed, is known, for example, in Japanese Patent Laid-Open No. 57-7381. According to this welding method, the physical effect of the arc is also dispersed in the circumferential direction of rotation due to the centrifugal force of rotation, and advantages such as peripheral dispersion of welding and flattening of the bead (concave bead) can be easily obtained. It is particularly effective when used in narrow gap welding of thick plates.

Conventional high-speed rotating arc narrow gap welding equipment has two types: one in which the welding tip rotates at high speed around an eccentric axis, and the other in which the torch is suspended by a fulcrum and rotated eccentrically below the fulcrum. Surikogi J without accompanying! There was something that made him move.

[Problem that the invention seeks to solve]

For those that rotate the welding tip eccentrically at high speed,
There is a drawback that a consumable sliding contact member such as a carbon brush is required during torch assembly to supply current to the chip.

On the other hand, this drawback is eliminated with the above-mentioned slicing tooth motion, but the distance from the fulcrum of the slicing tooth motion to the tip tip is large, so the torch axis stands up, and the rigidity of the arc in the axial direction causes lateral damage. The disadvantage is that welding becomes less likely.

In addition, regardless of the method, in conventional equipment, the welding tip and nozzle had a circular cross-section.
The radius of their rotational movement within the narrow gap is limited, and a sufficient centrifugal force cannot be generated unless the rotational speed is increased.

Therefore, it is an object of the present invention to provide a high-speed rotating arc narrow gap welding device that eliminates these drawbacks.

[Means for solving problems]

In the high-speed rotating arc narrow gap welding device of the present invention, in order to achieve the above-mentioned problems, the torch is eccentrically rotated while moving the torch in the direction of the groove line in the narrow gap sandwiched between the base material walls on both sides. In a device that performs build-up welding using a rotating arc caused by motion, a rotating torch is provided, in particular, comprising a flat tip and a flat nozzle, each of which has a flat cross-sectional shape in which the dimension in the groove width direction is smaller than the dimension in the welding direction, and the rotating torch. A rotation mechanism is provided that causes the tip of the flat tip to perform an eccentric rotational movement by performing a sliding motion without causing the tip to rotate on its own axis. Further, the rotary torch has a fulcrum of the slicing tooth motion between the tip of the flat tip and the point of force of the slicing tooth motion.

[Effect]

The rotary torch of the high-speed rotating arc narrow gap welding device of the present invention is equipped with a flat tip and a flat nozzle having a flat cross-sectional shape whose dimension in the groove width direction is smaller than the dimension in the welding progress direction, and this torch has the following features: A fulcrum of the slicing tooth motion is provided between the tip of the flat tip and the power point of the slicing tooth motion, and eccentric rotational drive at the power point causes the tip end of the tip to rotate in a slicing tooth shape drawing a wide-angle conical locus around the fulcrum below the fulcrum. Therefore, the distance between the tip end and the fulcrum can be reduced, and the torch can be rotated with the axis tilted at a relatively large angle, making it possible to obtain sufficient centrifugal force.

Furthermore, within the groove, the short axis of the flat cross-sectional shape of the flat tip is oriented in the width direction of the groove, and with the same cross-sectional area, the flat tip can be placed closer to the groove wall surface than a circular tip, so the rotation is greater. Eccentric rotation with a radius is possible.

〔Example〕

In FIG. 1, a welding head 1 hangs and supports a rotating torch 3 at an angle via a rotating mechanism 2, and the torch 3 has a flat nozzle 4 and a flat tip 5 at its lower portion. As shown in FIG. 2, this flat tip 5 has a flat cross-sectional shape in which the dimension W in the groove radius direction is smaller than the dimension in the welding direction, and the flat nozzle 4 also has a similar flat cross-sectional shape. are doing. In the figure, the groove of the weld base material 6 is somewhat exaggerated.

The rotation mechanism 2 eccentrically rotates the upper part of the torch 3 about the axis 7, but in this case, the torch 3 does not rotate, but performs a so-called slicing motion. The torch 3 intersects the rotation axis 7 at the nozzle 4 in its inclined hanging state, and this intersection 8 is the point at which the torch 3 rotates 1t! It becomes the fulcrum for l (swing rotation). This fulcrum 8 is located below the driving force point of the rotation mechanism 2 of the torch 3, and the tip 5 rotates eccentrically at a sufficient angle of inclination. The locus of eccentric rotation of the tip of the tip 5 is schematically shown in FIG.

Arc welding is performed in the welding progress direction shown by arrow Z with such eccentric rotation of the tip end.

〔Effect of the invention〕

As described above, according to the present invention, since the torch is rotated to generate a rotating arc, there is no need to use a brush for energizing the tip, and the cross-sectional area is the same by using a flat tip and a flat nozzle. In the case of a circular tip, the tip can also be placed close to the side wall of the groove, so it is possible to make the tip tip eccentrically rotate with a sufficient rotation radius in a narrow groove, and it can also be used as the fulcrum of the circular groove rotation movement. Since the tip is positioned closer to the tip tip than the point of force, eccentric rotation of the tip tip can be performed at a sufficiently large torch angle, and sufficient centrifugal force can be applied to ensure sufficient welding to the groove sidewall. It is.

[Brief explanation of the drawing]

Fig. 1 is a side view schematically showing an embodiment of the present invention; Fig. 2 is a side view schematically showing an embodiment of the invention;
The figure is a plan view schematically showing the eccentric rotation locus of the flat tip tip on the same groove surface. In the figure, 1 is the welding head, 2 is the rotation mechanism, and 3 is the rotation)・-
4 is a flat nozzle, 5 is a flat tip, 6 is a welding base material,
Reference numeral 7 indicates the rotation axis, and 8 indicates the fulcrum of the surikogi rotational movement.

Claims (1)

[Claims] The narrow groove sandwiched between the base metal wall surfaces on both sides is overlay welded by a rotary arc caused by eccentric rotation of the torch while moving the torch in the direction of the groove line, and each dimension in the groove width direction is A rotating torch equipped with a flat tip and a flat nozzle having a flat cross-sectional shape smaller than the dimension in the welding direction, and a rotating mechanism that causes the rotary torch to perform a slicing motion without rotating on its own axis, and eccentrically rotates the tip of the flat tip. A high-speed rotating arc narrow gap welding device, characterized in that the rotary torch has a fulcrum of the slicing tooth motion between the tip of the flat tip and the point of force of the slicing tooth motion.