RU1798076C - Device for shielded-arc welding with nonconsumable electrode - Google Patents

Abstract

Usage: welding of aluminum and titanium alloys. SUMMARY OF THE INVENTION: 2 a shielding gas welding torch comprises a nozzle 1 in which a shielding tubular element 6 is located, and two elements 2 and 3 for providing a laminar flow of the shielding gas. Element 3 is made in the form of a grid. At the working end of the nozzle 1 there is a diaphragm 5. made with concentric rows of channels. The channels of the diaphragm 5 are made with diameters decreasing in the direction from the axis of the nozzle to the periphery. The diaphragm 5 and element 3 form an annular soothing chamber, the volume of which is equal to 1.5-3.0 volume of channels in the diaphragm. 1 ill. 2 tab.

Description

The invention relates to technology and equipment for arc welding in shielding gases by a non-consumable electrode of products from aluminum and titanium alloys.

The purpose of the invention is to improve the quality of welded joints of aluminum and titanium alloys.

The drawing shows the construction of the device, section.

The device comprises a housing 1 in which a tubular element 2 of insulating material is placed. In the housing 1 there are two elements 3 and 4, the lower of which is made of metal mesh. Elements 3 and 4 provide a laminar flow of protective gas. At the working end of the housing 1, a diaphragm 5 is installed with concentric rows of channels. Together with element 4, the diaphragm 5 forms an annular stilling chamber 6. The channels of the diaphragm 5 are made with diameters decreasing from the axis of the nozzle to the periphery, and the volume of the stilling chamber is 1.5-3.0 the volume of channels in the diaphragm

5;...-.

In the housing 1 is installed on the axis of the device sleeve 7 of quartz glass. The housing 1 is secured to the element 2 with pins 8.

The claimed device operates as follows.

Through the housing 1 of the device, the protective gas enters element 2. Through the channel system, part of the protective gas enters the sleeve 7, and the other part into the internal volume of the housing 1. A part of the protective gas flow entering the sleeve 7 provides blowing of the electrode and its protection against oxidation and destruction by vapor of the weld metal.

The gas flow inside the housing 1 enters the element 3, which is heated by the heat of the arc and the heated sleeve 7. The gas flow is laminarized. Impurities of oxidizing gases are absorbed by the heated material of element 3.

Then the gas stream through the stilling chamber b enters the diaphragm 5. Through the channels in the diaphragm 5, the protective gas expires, protecting the molten metal of the weld pool. Due to the high rate of gas outflow from the peripheral channels of the diaphragm and its supply at an angle of 45, reliable displacement of air from the weld zone is ensured.

The inventive device was tested during welding of nozzles made of alloy 1419.

The nozzle was installed on the burner RGA-150. Inner - nozzle sleeve had a diameter of 8 mm with a wall thickness of 1 mm. The diameter of the nozzle body was 32 mm.

The gas nozzle lens was made of OT4 titanium alloy. In the diaphragm along the nozzle axis, channels with a diameter of 2.2 mm are made with a decrease in their diameter to the periphery of the nozzle to 0.8 mm. The volume of the still chamber exceeded the volume of the channels in the nozzle diaphragm by 2.3 times.

The diameter of the welded nozzles was 85 mm with a wall thickness of 1.0-1.5 mm. The pipes were welded from the ISVU-315 power source using an ADSV-6 welding tractor. A protective gas mixture containing 15% argon and 75% gel with a flow rate of 28-29 l / min was fed into the welding torch.

The rationale for the choice of the volume of the stilling chamber 6 for solving the problem is explained in Table 1.

For comparison, welding of the nozzles using an RGA-150 torch was performed,

equipped with a conical nozzle with a diameter of 20 mm. Data on the mechanical properties and quality of welded joints are given in table 2 ... .

Thus, the use of the claimed device reduces the likelihood of defects and improves the quality of welded joints of aluminum and titanium alloys.

Claims (1)

The claims An apparatus for shielded gas arc welding with a non-consumable electrode, comprising a nozzle with a tubular element located therein for shielding the non-consumable electrode and two elements for providing a laminar flow of the protective gas, the lower of. which in the direction of flow of the protective gas is made in the form of a grid, characterized in that, in order to increase quality of welded joints from aluminum and titanium alloys, it is equipped with a diaphragm located on the working end of the nozzle, made with concentric rows of channels and forming together with the annular soothing chamber lower in the direction of flow of the protective gas by the mesh, while the diaphragm channels are made with diameters decreasing in the direction from the nozzle axis to the periphery, and the volume of the still chamber is 1.5-3.0 the volume of the channels in the diaphragm. Table 1 Table 2