SU1256898A2 - Torch for arc gas-shielded welding - Google Patents

Description

The invention relates to a welding technique, can be used in semi-automatic and automatic welding, and is an improvement of the known device according to the basic author number 1181811.

The aim of the invention is to reduce the flow of protective gas and increase the efficiency of gas protection,

The drawing shows the proposed burner, section.

A torch for arc welding in protective gas contains a current-carrying tip 1 mounted in nozzle 2 concentric to it. The current-carrying tip 1 is filled with a channel 3 with a diameter d for guiding the melting electrode 4.

In the lower part of the nozzle 2, the cup 5 and the resonator 6 are coaxially mounted, the end of which is pointed, and the pointed end of the resonator

d, is located at a distance f, where d is the diameter of the channel for guiding the melting electrode from the axis of the current-carrying tip 1. Along the axis of the cavities of the glass 5 and the resonator 6, perpendicular to the axis of the nozzle 2

rod 7, fitted with a washer 8.

A hole is made in the bottom of the cup 5, in which a tube 9 is fixed, which is a channel for supplying protective gas. The glass 5 and the resonator 6 are fixed in a cylindrical housing 10, in the spherical part of which there is a hole 11 for the passage of the melting electrode. A hole 12 is made in the lower part of the housing, centered along the axis of the burner, the diameter of which is 1.1-1.3 times less than the distance between the ends of the resonator and the glass.

The distance Z from the cutting axis of the nozzle 2 to the resonator 6 is related to the diameter d of the welding nozzle 2 by the following relationship:

0.29

d.

nachi

but

where a is the turbulence coefficient of the jet, determined by the geometry of the flow part of the burner.

The burner works as follows.

When turning on the wire feeder (melted

electrode) 4 at the same time through the tube 9 is supplied a protective gas. The protective gas coming out of the annular slotted nozzle formed by the 8-core washer - the reamer surface of the glass 5, under a slight overpressure of up to 0.1 atm, hits the pointed end of the resonator 6, exciting periodically vortices on it. One of the harmonic components is established by the resonator 6 and is emitted into the surrounding space in the form of acoustic waves.

Due to the fact that the pointed end of the resonator 6 is placed on

d the distance-r- from the axis of the current-carrying tip, there is no displacement of the axis of gas flowing from the nozzle of the gas flow axis, which contributes to ensuring effective gas protection without increasing the flow of protective gas. Due to the fact that the distance from the nozzle exit 2 to the resonator 6 is related to the inner diameter d of the nozzle 2 by the following relationship:

0

thirty

t 0,29

,

but

five

0

five

0

where a is the jet turbulence coefficient, depending on the geometry of the flow part of the burner, gas protection of the welding wave is provided.

Since the shielding gas flows from the annular slit nozzle under a slight overpressure of up to 0.1 atm, the flow driving the end of the resonator periodic vortices tends to flow around the end of the resonator, therefore the axis of symmetry of the gas flowing out of the nozzle will be shifted towards the end of the resonator, therefore the symmetry of the velocity fields of the gas flowing out of the nozzle is lost, which impairs the protection of the weld pool. In order to provide effective protection in this case, an increase in the flow rate of protective gas is required.

When the end of the resonator pa is located at a distance from the axis of the current5 of the feed tip, the symmetry axis of the gas flow flowing out of the nozzle does not shift, resulting in an effective 312568984

non-gas protection does not require an increase in resistance to the consumption of protective gas. the wall layer of the nozzle in the stream, so that the flow has less

The part of the nozzle G is the shape of the energy that is increased by the non-uniform part of the gas flow. If nozzles. What

, 29 -I, the flow is interrupted by an over- also impairing the effectiveness of protection.

welding bath.

This nozzle also creates an additional proposed arc burner.

turbulence, as a result of which p shielding gases ensure the formation of a gas flow, it ensures efficient gas protection

nozzle i.e. protection of the weld pool is deteriorated with a minimum extension bath. If f 0.29. protective gas.

Claims (1)

ARC WELDER WITH PROTECTIVE GASES No. 1181811, characterized in that, in order to reduce the consumption of protective gas and increase the efficiency of gas protection, the pointed end of the resonator is located at a distance from the axis of the current-supplying tip, where d is the diameter of the channel for the direction of the electrode, and the nozzle exit from the resonator is located at distance I = 0.29 ---, where d. - the inner diameter of the nozzle; and - the turbulence coefficient of the gas stream, determined by the geometry of the flow part of the burner. KD SP ζ ©