SU1703326A1 - Non-consumable electrode welding apparatus - Google Patents

Abstract

The invention relates to an arc csap with a non-consumable electrode and can be used in various industries of the national economy. The purpose of the invention is to improve the quality of welded joints by stabilizing the length of the arc during welding with a short and submerged arc, as well as ensuring the vibration of the electrode with the minimum length of the arc. The device contains a welding torch 3 with a pneumatic actuator 2, which is made in the form of a chamber consisting of two cavities separated by a membrane 15. One cavity is connected to the air line, and the membrane 15 is spring-loaded from the other cavity. The device is equipped with a pneumatic switch 1 mounted on the chamber pneumatic line 2 on the side opposite to the burner 3. Pneumatic switch 1 is made in the form of a housing 4, in which the inlet 5 and outlet 6 electrovalves are mounted. In the case, the channel 7 is also filled with the air outlet cable 12. There are also intermediate channels 9 connecting the solenoid valves to the cavity of the pneumatic actuator chamber. In the output channel 12 is installed adjusting screw 11, having a variable cross section. The use of the device provides high quality welded joints, avoiding short circuits when using a short and submerged arc. 1 hp ff, 1 ill.

Description

The invention relates to electric arc welding with a non-consumable electrode in a shielded gas environment and can be used in various industries of the national economy.

The aim of the invention is to improve the quality of welded joints made by a non-consumable electrode in a protective gas environment on a direct current with a short and submerged arc.

The drawing schematically shows a device for welding with a non-consumable electrode.

The proposed device consists of a pneumatic switch 1, a pneumatic drive 2 and a burner 3. The pneumatic switch 1 includes a switch case 4, on the upper wall of which the inlet 5 and outlet 6 electro clamps are attached. The compressed air enters the inlet of the channel 7 through the fitting 8. The intermediate channel 9 connects the solenoid valves 5 and 6 to the pneumatic chamber 10, which is part of the pneumatic actuator 2. The adjusting screw 11 is connected to the outlet of the channel 12.

Pneumatic actuator 2 contains upper 13 and lower 14 pneumatic actuator covers. The flexible element is designed as a flexible rubber membrane 15 and is pressed to the upper position through the support plate 16 by the rod 17 by means of a spring 18. The burner 3 is rigidly connected to the rod 17.

The device works as follows.

Before the welding cycle is performed, the inlet electrovalve 5 is opened, and the pressure of compressed air in the pneumatic chamber 10 increases to the value PL. The pressure Pi in the initial position is controlled by the electrovalve 6, thereby moving the movable part of the burner 3 in the vertical direction to the extreme upper or lower position. Picking up the value of Pi, corresponding to the average position of the membrane, the electro-valve 5 is closed. The system of automatic voltage control on the arc sets the base voltage value on the lie arc, corresponding to the minimum electrode outreach and the minimum arc length I. The device is ready to perform the welding cycle.

When welding a flat surface, the voltage across the arc does not differ from the base value Uc, thereby the solenoid valves 5 and 6 are closed and the movable part of the burner does not move.

Decreasing the arc length to 12 And changes the voltage on the arc to Ug Us. The automatic voltage regulation on the arc opens the solenoid 6 and the pressure in the pneumatic chamber 10 decreases to 2 PL The rod 17 together with the burner 3 under the action of the spring 18 moves upward until the arc length increases to the value I, and the voltage on the arc to Ue. The solenoid valve 6 is closed.

As the arc length increases to CI and the voltage on the Ug Ue arc changes, the automatic voltage control system on the arc opens the solenoid 5 and the pressure in the pneumatic chamber 10 increases from Pg to Pz. The rod 17 moves downward until then. until the arc length is reduced to b, and the voltage across the arc to u. Valve 5 is closed.

For a given value Pi, li, Ue adjustment screw 11, you can pick up a critical section of the outlet of the channel 12 SCR, at which the solenoids

5 and b are alternately opened, providing oscillations of the movable part with a constant frequency of small amplitude near a predetermined value of the arc length h and the base voltage Ub.

The proposed design allows the required length of the arc to be maintained with high accuracy in the process of weld overlap, as well as the electrode oscillation at a minimum height from the surface of the weld pool with a constant frequency of small amplitude. This ensures non-consumable direct current electrode welding with a high degree of weld quality.

Claims (2)

1. A device for welding with a non-consumable electrode containing a welding torch with a pneumatic actuator, made in the form of a chamber of two cavities separated by a membrane, one of the cavities is connected through a fitting to the air inlet, and the membrane from the other cavity is spring-loaded, characterized in that in order to improve the quality of welded joints by stabilizing the arc length when welding with a short and submerged arc, it is equipped with a pneumatic switch mounted on the pneumatic drive chamber on the side opposite to the mount lke and made in the form of a housing on which the inlet and outlet solenoid valves are mounted, wherein the housing has channels for the entry and exit of compressed air connected to the solenoids and intermediate channels connecting the solenoids to the pneumatic actuator cavity. 2. The device as claimed in claim 1, in which, in order to ensure the vibration of the electrode with the minimum arc length, an adjusting screw of variable cross section is installed in the outlet of the pneumatic switch. 4 5 f -ZHir /. ..... J - ----- -I and I - - ------, eleven and