One-side arc welding device

Abstract

A one-side arc welding device (100) capable of performing welding without generating a welding defect comprises: base plate members (21, 22) which extend along a welding direction; magnetic attraction members (27-29) which are arranged in a longitudinal direction of the base plate member at the side of the base plate member and magnetically attract a steel plate to be welded (1, 2) located on the base plate member; a welding torch (4) which moves along a welding line (3) of the steel plate to be welded and sends out a welding wire (5); and a welding power source (6) which supplies an electric current to the welding wire to generate an arc between the welding wire and the steel plate to be welded. The welding power source is installed on the welding start side or welding end side of the welding line, connects each of the magnetic attraction members and a power source ground terminal (6b) of the welding power source via a power source ground connection terminal (101a) installed on the welding start side of a stand frame (101), and a ground current returns to the welding power source via the plurality of magnetic attraction members and the welding start side of the stand frame disposed from the welding start side to the welding end side of the welding line.

Description

technical field [0001] The present invention relates to a single-sided arc welding device that performs welding from the upper surface by moving a welding machine along a welding line of a plurality of steel plates to be welded held on a backing plate device. Background technique [0002] A single-sided submerged arc welding device (hereinafter referred to as a "single-sided arc welding device") is a device in which a backing device is placed below a welding line where the side ends of a pair of steel plates to be welded are butted together to prevent the molten metal from Drop, and arc welding is performed on one side of the steel plate to be welded on the welding line with a welding machine moving along the welding line. [0003] In this single-sided arc welding device, for example, the flux backing device and / or the copper plate backing device are extended and configured toward the welding direction, and the panel with a plurality of welded steel plates is delivered to th...

AI Technical Summary

Problems solved by technology

Therefore, when the route of the current flowing through the steel plate to be welded is unstable, there is a problem that the arc is not directed in the desired direction and becomes unstable.

In particular, in the case where the arc is directed backward, there is a problem that the weld bead is not formed on the back side of the welding line

[0012] In addition, when the contact between the current collector and the steel plate to be welded is unstable, there is a problem that the arc state also becomes unstable, sparks are generated between the steel plate to be welded and the contact portion where the contact is unstable, and the Arc marks on welded steel plates and current collectors

Therefore, there are problems in that it takes time for the preparatory operation before performing the welding operation, and the operation man-hours increase to make the operation cumbersome

Therefore, when it takes time to clarify the cause of the disordered bead shape on the back side, the single-sided arc welding device may be in a state of being unready for several months, which increases the inspection cost and production cost, and also affects the delivery time of the product, etc. have a big impact

[0033] However, even after adjusting the various welding conditions related to multiple welding wires, welding defects in which the shape of the back bead is disordered still occasionally occurs, so the cause is not an abnormality in the construction process, and it is urgent to identify and eliminate the cause from the device.

In addition, this welding defect often becomes a shape defect of the welding part on the back side of the welding line

It is required to repair the welding defect by welding upward from the narrow back side of the site, and even if the occurrence frequency of the welding defect is small, the repair operation on the back side of the steel plate to be welded is a laborious operation, which is a big problem. point

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