JPS6117376A - Nonconsumable electrode welding machine - Google Patents

Abstract

PURPOSE:To obtain a titled welding machine that removes metallic gas etc. generated by arc immediately and enables stable welding for a long time by spouting inert gas from an inert gas spouting mechanism from the side of the electrode of a nonconsumable electrode welding machine. CONSTITUTION:In a nonconsumable electrode welding machine in which a nonconsumable electrode 4 that keeps optimum gap from the surface of surface treated metal 7 is attached at the tip of the nozzle 3 of a torch fitted to a large diameter through hole of a supporting member 8 and fixed by a screw 9, and welding is made shifting the electrode in the direction of arrow mark A, a tube 10 having a head part 13 is inserted in the small diameter hole of above- mentioned supporting member 8 and fixed by a screw 11. During welding, inert gas 17 is supplied from a rubber hose to the head part 13 through the tube 10, and spouted from a guide nozzle 15 in the direction of arrow mark B, opposite to the direction of advance of the nozzle 3 through a hollow 14 and a small hole 16. Thus, metallic gas such as zinc etc. and molten substance generated by the arc are blown off to the back of the electrode 4 and deformation and damage of the electrode 4 are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present BA relates to a non-consumable electrode welding machine for welding surface-treated metals such as galvanized steel sheets.

[Prior art]

FIG. 2 is an explanatory diagram showing the main parts of a conventional non-consumable electrode welding machine. In the figure, (1) is the welding torch body, (2
) is a handle fixed to the welding torch body (1) in an electrically insulated state, (3) is a ceramic nozzle fixed to the welding torch body (1), and (4) is a tungsten electrode. The tip is polished to form an acute angle, and is fixed at the center of the lower surface of the nozzle (3), while the other end passes through the welding torch body (1). (5) indicates the flow state of the inert gas.The inert gas passes through the flow path provided through the welding torch body (1) and the nozzle (3), and flows downward from the opening provided on the bottom surface of the nozzle. is emitted, shielding the welding arc (6) from the atmosphere.

A conventional non-consumable electrode welding machine is constructed as described above, and the tip of the electrode (4) is maintained at a gap suitable for arc generation to the surface of the surface-treated metal (7), and the welding torch (1) is
Welding is performed without manually or automatically moving the welding line along the welding line.

However, in the case of metals whose surface has been treated with galvanizing, the galvanized layer melts due to arc heat and becomes gas.

The zinc gas flows mixed with an inert gas (5),
Contact with the tungsten electrode (4). As a result, the zinc gas solidifies and adheres around the electrode (4). In addition, the inert gas (5) is mixed into the molten zinc, forming bubbles and then bursting. At the time of rupture, the molten zinc that scatters adheres to the tip of the electrode (4) and solidifies, changing the tip of the electrode (4) into an obtuse angle shape. If such a failure occurs during welding, the heat concentration of the welding arc decreases, making it impossible to continue welding. As described above, conventional non-consumable electrode welding machines for welding surface-treated metals have had various drawbacks.

[Summary of the Invention] The present invention has been made to improve the above drawbacks, and by providing an inert gas ejection mechanism on the side of the electrode, metal gas such as zinc, which is often generated by arcing during welding, can be removed. The objective is to provide a non-consumable electrode welding machine that immediately removes molten material, prevents damage to the electrode, and enables stable welding over a long period of time.

[Embodiments of the invention]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention. In the figure, (1) and (3) are the same as the conventional device, and d (8) is a supporting member arranged at an angle;
Horizontal screw holes are provided on both sides, and large-diameter and small-diameter through holes are provided in the thickness direction. A nozzle (3) is inserted into the large-diameter through hole, and an electrode (
4) and the surface of the surface-treated metal (7) are screwed to the support member (8) at a position that maintains an optimum gap for arc welding. Further, a pipe αQ for supplying inert gas is fitted into the small diameter hole and screwed to the support member (8). (6) is a rubber hose connected to the end of the pipe α0 in order to supply inert gas from the inert gas supply source to the pipe α1 (Ll is connected to the head part fixed to the lower end of the pipe OQ). The head part α → has a cavity α for ventilation of inert gas inside.
It consists of a block-shaped member with → and a cylindrical guide nozzle (G) installed in the horizontal direction of the member. A large number of communicating small holes α→ are open.

The non-consumable electrode welding machine configured as described above welds the surface-treated metal while moving in the direction of arrow A in FIG. At this time, the inert gas αη supplied from the inert gas supply source is ejected from the rubber hose (2), the pipe (10 and the small hole 0Q that communicates radially through the cavity α◆, and reaches the inner wall of the guide nozzle). After the collision, the gas becomes a uniform flow within the guide nozzle (g) and is ejected as a guide. As shown by arrow B, the ejected gas flow passes around the electrode (4) and through the gap between the tip of the electrode (4) and the surface treatment fully bent (7), discharging gases such as zinc generated during welding. Blow it out behind the electrode (4).

In the above embodiment, the nozzle (3) and the inert gas supply pipe α1 are fixed to the support member (8), but the material of the surface-treated metal (7), the shape of the weld line, etc. If it is necessary to change the attitude of the electrode (4) depending on the welding conditions, the supporting member (8) can be made into a bending mechanism to change the attitude of the electrode (4) and adjust the guide nozzle (1) accordingly.
→ The opening can be placed in the optimal position.

〔Effect of the invention〕

As explained above, the present invention has a simple structure in which inert gas is ejected from the side of the electrode in the direction of welding progress. The electrode can be removed after 10,000 yen. Therefore, there is no damage to the electrode, such as loss of shape at the tip of the electrode, so surface-treated metal can be stably welded for a long time using a non-consumable electrode welder.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a main part of a conventional non-consumable electrode welding machine. In the figure, (3) is a nozzle, (4) is an electrode, (7) is a surface treated metal, (8) is a support member, (9) is a screw, 01
is a pipe, Qυ is a screw, (b) is a rubber hose, a3 is a head, α4 is a cavity, 4 is a guide nozzle, and 4 is a small hole. Note that the same symbols in each figure indicate the same or equivalent parts. do.

Claims (1)

[Claims] A non-consumable electrode welding machine for welding surface-treated metals, characterized in that the machine is equipped with an inert gas ejection mechanism that ejects inert gas from the side of the electrode.