JPH0619979U - Carbon dioxide arc automatic welding machine - Google Patents

Abstract

(57) [Summary] [Structure] A part of the spatter scattered at the time of melting the metal welding wire rod is a protective cylinder 5 fitted to the inner circumference of the tip of the nozzle 1.
Adheres to the inner surface of. Since the protective cylinder 5 made of alumina, which is a ceramic material, has high heat resistance and is not melted by the heat of the spatter, it is not melted and welded to the spatter like a nozzle made of metal. [Effect] The spatter attached to the inner peripheral surface of the protective cylinder 5 can be easily removed by rubbing with a brush.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carbon dioxide arc automatic welding machine capable of preventing spatter that is scattered when a metal welding wire is melted from directly adhering to the inner peripheral surface of a metal nozzle in carbon dioxide arc welding. It is a thing.

[0002]

[Prior art]

 Conventionally, an automatic carbon dioxide arc welding machine is a metal contact chip in which a supply hole is formed in the hollow of the tip of a cylindrical metal nozzle to open the tip surface and supply the metal welding wire. Is separated from the nozzle and supported, and the tubular space between the nozzle and the contact chip has a structure that serves as a flow passage for the flow of carbon dioxide gas. The carbon dioxide gas sent through the flow passage is connected to the tip of the nozzle. The metal welding wire supplied from the tip of the contact chip through the supply hole while being blown out from the welding part is melted by the heat of the arc generated by the current flow to join the base metal. It was being done.

[0003]

[Problems to be solved by the device]

 When welding, when the metal welding wire melts, it spatters to the surroundings as a spatter, and part of the spattered spatter directly from the welding position or hits the base metal. By bouncing back, it jumps into the flow passage from the tip of the nozzle and adheres to the inner peripheral surface of the nozzle.

If the spatter attached to the inner peripheral surface of the nozzle is left as it is, not only the flow passage is gradually narrowed to prevent the flow of carbon dioxide gas, but also the nozzle and the contact chip serve as electrodes. In this case, there is a risk that both of them will be short-circuited via the sputter, so it is necessary to appropriately remove the attached spatter.

In the conventional carbon dioxide arc automatic welding machine, when the inner peripheral surface of the nozzle made of metal remains exposed, the spatter adheres to the inner peripheral surface of the nozzle in a molten high temperature state. I was crying. For this reason, the inner peripheral surface of the nozzle is melted by the heat of the spatter to weld the spatter, and the spatter cannot be easily removed by a simple means such as rubbing with a brush.

Therefore, when the amount of spatter melted in the nozzle exceeds the allowable range, the cumbersome work of removing and replacing the nozzle must be performed, and the welding work takes a long time. However, in order to remove the sputter from the removed nozzle, it is necessary to grind the inner peripheral surface of the nozzle, which is a troublesome work. .

[0007]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems, the present invention provides a metal having a supply hole formed in the hollow of the tip of a cylindrical metal nozzle, the supply hole opening to the tip surface to supply a metal welding wire. A contact chip made of ceramics is supported separately from the nozzle, and a protective tube with high heat resistance made of ceramic material is detachably fitted on the inner circumference of the tip of the nozzle. The space was designed as a flow passage for the flow of carbon dioxide.

[0008]

[Operation and effect of the device]

 The present invention has the above-mentioned configuration, and when welding is performed, carbon dioxide gas sent through the flow passage between the protective tube fitted to the inner circumference of the tip of the nozzle and the contact chip is sprayed onto the welded portion of the base metal. In such a state, while supplying the metal welding wire from the tip of the supply hole of the contact chip, a welding current is applied to generate an arc, and the heat of the arc melts the metal welding wire to join the base materials together. Let

Part of the spatter spattered during welding jumps into the hollow of the nozzle, and the sputtered spatter adheres to the inner peripheral surface of the protective cylinder, not to the inner peripheral surface of the nozzle. Become.

If the amount of spatter adhered to the inner peripheral surface of the protective cylinder exceeds the allowable range, remove the protective cylinder from the inner periphery of the nozzle and rub the spatter adhered to the inner peripheral surface with a brush or the like. You can do it like this. Since the protective cylinder is made of a ceramic material and has high heat resistance, it is not melted by the heat of the spatter attached in the molten high temperature state. Therefore, unlike the conventional automatic carbon dioxide arc welding machine in which the metal nozzle is exposed and the spatter is welded to the inner peripheral surface, the spatter attached to the inner peripheral surface of the protective cylinder is easy. Scrubbed by.

As explained by the above operation, in the carbon dioxide arc welding machine according to the present invention, the protective cylinder to which the sprayer is attached can be removed from the nozzle, and the replacement work of the protective cylinder can be performed as in the conventional case. Moreover, compared to the case where the entire nozzle is replaced, it can be performed more easily, and there is an effect that the efficiency of the welding work can be improved more than before.

Further, since the protective cylinder to which the melted spatter in the high temperature state adheres is made of a ceramic material and has high heat resistance, there is an effect that the adhered spatter can be easily removed.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. The nozzle 1 is made of copper and has a cylindrical shape, and its rear end is attached to a main body of a welding machine (not shown). Inside the hollow of the nozzle 1, a contact chip 2 made of copper having a circular cross section for supplying a metal welding wire (not shown) from the tip of the supply hole 3 is supported at its rear end by a support member (not shown), so that the nozzle 1 is provided. The nozzle 1 is mounted concentrically with the nozzle 1 in a state of being separated from the inner peripheral surface. Further, these nozzle 1 and contact chip 2 serve as electrodes for generating an arc by energization.

The tip 1 of the nozzle 1 has a cylindrical shape with a thin wall thickness and an outer diameter dimension slightly smaller than the inner diameter dimension of the nozzle 1, and a protective tube 5 made of alumina and having high heat resistance can be removed. It is installed. On the outer peripheral surface of the protection cylinder 5, a thin and thin elastic holding plate 6 made of metal is adhered over the entire length of the central portion in the width direction with its length direction parallel to the axial direction of the protection cylinder 5. As a result, they are fixed so as to maintain a substantially flat state as shown by the chain line in FIG. Further, the rear end portion 6a of the elastic holding plate 6 is folded back to the inner peripheral side of the protective cylinder 5.

The protective cylinder 5 is fitted in a state where the elastic holding plate 6 is elastically deformed as shown by the solid line in FIG. 1 and pressed against the inner peripheral surface of the nozzle 1. The protective cylinder 5 fitted in the nozzle 1 is always held so as not to move due to the frictional force with the nozzle 1 generated by the elastic restoring force of the elastic holding plate 6, and is larger than the frictional force. When a force is applied, the nozzle 1 can be moved in its axial direction.

Further, the cylindrical space between the protective cylinder 5 mounted on the inner circumference of the nozzle 1 and the contact chip 2 is oxidized from the tip of the nozzle 1 toward a place where a base metal (not shown) is welded. It serves as a flow passage 9 for circulating the carbon dioxide gas 8 for prevention.

The present embodiment has the above-mentioned structure, and when welding is performed, the carbon dioxide gas 8 sent through the flow passage 9 between the contact tip 2 and the protective cylinder 5 mounted on the inner circumference of the tip of the nozzle 1 is removed. It is sprayed from the tip of the nozzle 1 toward a welded portion of a base material (not shown). In this state, while supplying a metal welding wire (not shown) from the tip of the supply hole 3 of the contact chip 2, a welding current is passed to generate an arc between the nozzle 1 and the contact chip 2, and the heat of the arc is generated. The base materials are joined together by a metal welding wire that is melted by.

A part of the spatter spattered when the metal welding wire rod melted jumps into the hollow of the nozzle 1 by jumping directly from the welding point or by hitting the base metal and jumping into it. The spatter adheres not to the inner peripheral surface of the nozzle 1 but to the inner peripheral surface of the protective cylinder 5.

When the amount of spatter attached to the inner peripheral surface of the protective cylinder 5 exceeds the allowable range, the welding is interrupted, the elongated withdrawing rod 10 is inserted into the flow passage 9, and the hooking claw at the tip thereof is inserted. The protection cylinder 5 is pulled out from the inside of the nozzle 1 by engaging 11 with the rear end surface of the protection cylinder 5 and pulling the protection cylinder 5 toward the tip side of the nozzle 1. After removing the protective cylinder 5 from the nozzle 1 in this manner, the spatter attached to the inner peripheral surface of the protective cylinder 5 may be rubbed with a brush.

Since the protective cylinder 5 is made of alumina, which is a ceramic material, and has high heat resistance, the inner periphery of the protective cylinder 5 will not be melted by the heat of the spatter attached in a molten high temperature state. Therefore, unlike the conventional automatic carbon dioxide arc welding machine in which the metal nozzle was exposed and the sprayer was welded to the inner peripheral surface, it adhered to the inner peripheral surface of the protective cylinder 5. The spatter can be easily removed by rubbing it with a brush.

In the present embodiment, the case where alumina is used as the material of the protective cylinder 5 has been described, but according to the present invention, ceramics other than alumina are used as the material of the protective cylinder. Good.

[Brief description of drawings]

FIG. 1 is a front view.

FIG. 2 is a vertical sectional view.

[Explanation of symbols]

1: Nozzle 2: Contact chip 3: Supply hole 5:
Protective cylinder 8: Carbon dioxide 9: Flow passage

Claims (1)

[Scope of utility model registration request] 1. A metal contact chip having a supply hole for supplying a metal welding wire, which is opened at the front end surface, is separated from the nozzle in the hollow of the front end of a cylindrical metal nozzle. A heat-resistant protective cylinder made of ceramic material is detachably fitted to the inner circumference of the tip of the nozzle, and carbon dioxide gas is circulated in a cylindrical space between the protective cylinder and the contact chip. A carbon dioxide arc automatic welding machine characterized by being used as a flow passage.