DE102018204710A1 - Welding device for Hubzündungschweißen - Google Patents

Abstract

The invention relates to a welding apparatus for lifting ignition welding with a welding element holder (12) for holding a welding part (2), and a gas ring (20) which is formed radially around the welding element holder (12) and surrounds a gas space (22) surrounding the welding element holder (12) ) limited. The gas ring (20) has gas guide channels (24) through which a protective gas in the gas space (22) can be introduced, wherein the gas ring (20) is made of aluminum and the gas guide channels (24) through the gas ring (20) obliquely inwards extend in the direction of a front end of the welding element receptacle (12).

Description

The invention relates to a welding device for Hubzützschweißen.

In lift-and-strike welding, a welded part, e.g. may be a welding stud or a ball, received in a welding element holder (stud holder) of a welding device and placed on the component. Then a current is passed through the welding part and the component and the welding part is lifted by retracting the welding element holder by a defined distance from the component. It comes to the formation of an arc. The current is increased to a welding current, whereby material of the component and / or the welding part melts. After a predetermined welding time, the welding part is lowered onto the component or slightly pressed into it. The welding current is switched off and, with cooling of the molten material, a cohesive joining connection is formed between the welded part and the component. In order to improve the quality and appearance of the weld, it is customary to perform the welding under a protective gas atmosphere.

A suitable for the Hubzündungschweißen welding apparatus is for example from the DE 10 2016 217 499 A1 known. Such a welding device has a bell-shaped element with which it is placed on the component, whereby a welding chamber is formed, in which the Hubzützschweißen takes place. The chamber can be traversed during the welding process with inert gas.

Depending on the welding parts used, different degrees of spatter formation occur. If e.g. Spherical elements or double balls used, so a particularly high load of the welding device is detected by spatter, which lead to gas flow problems and consequent strength problems of the weld. Furthermore, an increased system wear is detectable, whereby the system availability decreases and costs rise.

Against this background, it is an object of the invention to provide a Hubzündungschweißvorrichtung with which in particular the welding of spherical welding parts process reliable and can be realized with high system availability and efficiency.

The object is achieved by a Hubzündungschweißvorrichtung according to claim 1. Further advantageous embodiments will become apparent from the dependent claims and the description below.

A welding device is specified for welding a welded part to a component by means of a lift-and-lift welding method. The welding device includes a welding element holder for holding a welding part, and a gas ring which is formed radially circumferentially around the welding element holder and defines a gas space surrounding the welding element holder. The gas ring has gas guide channels through which a protective gas can be introduced into the gas space. The gas ring is made of aluminum and the gas guide channels extend through the gas ring obliquely inwards towards a front end of the welding element holder.

By choosing the material aluminum and the oblique arrangement of the gas guide channels, the adhesion of weld spatter can be reduced. In particular, the gas ring made of aluminum shows no significant signs of wear due to splashes. Adherent beads of sweat can be e.g. Remove by compressed air cleaning. It will be achieved long service life of the gas ring. Also, the gas ring made of aluminum can be produced easily and inexpensively.

The gas ring is preferably attached to a housing of the welding device. The welding element holder is movable relative to the gas ring and the housing for the exercise of the lifting movement.

The welding device may in one embodiment further comprise a mouthpiece which is placed on the component during the welding with an end face, wherein an end portion of the end portion containing the mouthpiece protrudes from the gas ring and is formed of brass. In other words, at least that portion of the mouthpiece, which protrudes from the gas ring and thus can come into contact with spatter, is formed of brass. In this way, the spatter adhesion can be further reduced, also shows brass very insensitive to shock loads, which is advantageous for a series use with a variety of welds.

In one embodiment, the mouthpiece can extend around the outside of the gas ring on the circumference and can be made entirely of brass. The attachment of the mouthpiece in this embodiment preferably takes place on the gas ring, e.g. by means of screwing. Such a mouthpiece is easy and therefore inexpensive to manufacture. An exchange, e.g. because of wear, is easily possible. For example, the mouthpiece from the front on the gas ring can be plugged.

It is particularly advantageous if the end portion of the mouthpiece and the gas ring form a common, cylindrical gas space. Turbulence of the inert gas and a possibly negative influence on the arc can be reduced.

During the welding process, the welding device is placed on the component. Through the gas supply ducts protective gas is introduced into the gas space, which flows around the welding part and the joint. The protective gas enters the gas space via gas inlet openings from the gas supply channels, which is formed in a cylindrical manner around the welding element holder. To ensure optimum gas supply, it has proved to be particularly advantageous if the gas supply channels at an acute angle, preferably in a range of 20 degrees to 30 degrees and in particular 35 degrees, inclined to the joining axis and with a diameter of at least 3 mm at the gas outlet openings end up. The joining axis is given by the axis of movement of the welding part holder. As the diameter increases, the amount of inert gas required for the welding process increases. With regard to an optimal protective gas supply, it may be advantageous if the diameter of the gas supply channels is in a range of 3 mm to 5 mm.

The combination of minimum diameter and inclined arrangement avoids that spatters accidentally entering the channels become clogged. Surprisingly, it has been shown that with a gas ring made of aluminum, which is provided with Gaszuführkanälen with the optimized diameter, which are inclined in the region of the outlet openings relative to the joining axis at an acute angle, despite massive spattering clogging of the protective gas supply channels could be reliably prevented. As a result, the protective gas supply can be ensured even after many welding cycles, and the welds achieve the process reliability required for series production.

The gas ring preferably has a plurality, in particular three to five, gas supply channels, which are distributed uniformly along the circumference of the gas ring. This allows a uniform gas input from all sides and a secure protective gas cover of the joint can be achieved.

The use of the welding device described above is not limited in terms of the type and geometry of the welding parts to be welded. However, the welding device achieves particular advantages when it is used to weld ball-like welded parts onto a component. The term ball-like is to be understood broad, so that not only balls, but also double balls or spherical segments should fall under it. The error rate due to insufficient protective gas flow can be reduced. Rework is reduced. There is no significant wear on the gas ring and mouthpiece detectable, whereby the ongoing costs and maintenance costs are reduced. Overall, compared to conventional gas ring and mouthpiece significantly increased system availability is given.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, embodiments of the invention are described in detail. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination. If the term "can" is used in this application, it is both the technical possibility and the actual technical implementation.

• 1 eine Prinzipdarstellung einer Hubzündungsschweißvorrichtung gemäß der Erfindung,
• 2 eine Draufsicht auf den Gasring aus 1 und
• 3 eine Draufsicht auf das Mundstück gemäß 1.

Embodiments will be explained below with reference to the accompanying drawings. Show:

• 1 a schematic diagram of a Hubnündungschweißvorrichtung according to the invention,
• 2 a plan view of the gas ring 1 and
• 3 a plan view of the mouthpiece according to 1 ,

In 1 is a stroke ignition welding device 1 shown for welding a welding part 2 on a component 3 , The welding part 2 is according to 1 a ball. Of course, other welding parts such as welding bolts, etc. with the Hubzündungschweißvorrichtung 1 be welded. The component 3 For example, from a metal, such as a steel or similar. be prepared and is preferably a sheet metal component.

The lift-ignition welding device 1 includes a welding tool with a tool housing 10 , a welding element holder 12 and a charging pin 14 , The welding element holder 12 is sleeve-like, wherein one end portion has a plurality of circumferentially distributed arranged finger-shaped clamping elements, which cooperate as a clamping device.

For inserting the welding part 2 in the welding element holder 12 this is via a feed chute 16 For example, fed pneumatically and enters the interior of the sleeve-like welding element recording 12 , The charging pin 14 which is coaxial with the welding element holder 12 arranged and by means of an actuator, not shown is displaceable relative to this pushes the welding element 2 in a known manner through the interior in the direction of the end portion. This brings the charging pin 14 the force required to the clamping elements when pushing through the welding element 2 elastically spread outwards and the welding element 2 to bring to an end position. The end position is that position of the welding element 2 in relation to the welding element holder 12 in which the welding element 2 to be held during the Hubzündungschweißens.

Furthermore, the welding tool has a gas ring 20 on, which is formed of aluminum, and a mouthpiece 30 made of brass. The mouthpiece runs outside around the gas ring 20 around and faces this with an end section 32 in front. gas ring 20 and mouthpiece 30 are in a manner not shown on the housing 10 attached.

To perform a Hubzündungschweißung the welding device 1 with the end face of the mouthpiece 30 on the component 3 placed. The gas ring 20 as well as the end section 32 of the mouthpiece 30 limit a gas space 22 , which is cylindrical around the welding element holder 12 is formed around. Subsequently, the Hubzündungsschweißen takes place in a known manner, including first the welded part 2 with the component 3 is brought into contact at the joint and a current is passed through the welding part and component. By a relative movement of the welding element holder 12 relative to the tool housing 10 along a joining axis F becomes the welding part 2 slightly from the component 3 is lifted, whereby an arc is ignited. The arc leads to a partial melting of the component 3 and / or the welding part 2 , After a predetermined time, the welding part 2 by a relative movement between the welding element holder 12 and charging pin 14 on the one hand and tool housing 10 on the other hand again on the component 3 lowered and the power is turned off. The molten material cools to a welded joint between the welded part 2 and component 3 ,

In order to ensure the quality of the weld, the joint is flushed with inert gas during the arc ignition welding. The protective gas is in a known and not shown manner by gas guide channels 24 passed, which in the gas ring 20 are formed and occurs at gas outlet openings 26 in the gas space 22 from where it is the welding part 2 as well as the joint lapped. The gas guide channels 24 in the gas ring 20 run in the direction of the gas space 22 at an acute angle α opposite the joining axis F , preferably in the range of 20 degrees to 30 degrees, and more preferably below 25 degrees. The diameter D the Gaszuführkanäle is at least 3 mm, preferably up to 5mm. 2 shows a plan view of the gas ring 20 , The four gas guide channels 24 are circumferentially arranged symmetrically distributed.

The mouthpiece 30 also has a funnel-shaped body with the cylindrical end portion 32 , The mouthpiece 30 is with its inside dimensions to the gas ring 20 adapted so that the mouthpiece 30 on the gas ring 20 is pluggable. 3 shows a plan view of the mouthpiece 30 , For attachment to the gas ring 20 can eg drill holes 34 be provided.

By using the mouthpiece 30 made of brass and the gas ring 20 made of aluminum, the wear of the Hubzündungschweißvorrichtung can be significantly reduced. gas ring 20 and mouthpiece 30 prove to be extremely consistent in the series process, which could increase plant availability. There are also gas rings 20 and mouthpiece 30 inexpensive to produce.

LIST OF REFERENCE NUMBERS

1

welder

2

weldment

3

component

10

tool housing

12

Welding element holder

14

loading pin

16

feed chute

20

gas ring

22

headspace

24

Gas supply channels

26

Gas outlet

30

mouthpiece

32

end

34

drilling

α

angle

D

diameter

F

joining axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102016217499 A1 [0003]

Claims (7)

Welding device for stroke ignition welding with: - A welding element holder (12) for holding a welding part (2), and - A gas ring (20) which is radially encircling around the Schweißelementhalter (12) and defines a welding element holder (12) surrounding the gas space (22), wherein the gas ring (20) gas guide channels (24) through which a protective gas in the Gas space (22) can be introduced, wherein the gas ring (20) is made of aluminum and the gas guide channels (24) extend through the gas ring (20) obliquely inwardly towards a front end of the Schweißelementaufnahme (12). Welding device after Claim 1 , further comprising a mouthpiece (30) which is placed on a component with an end face during welding, wherein an end portion (32) of the mouthpiece (30) containing the end face protrudes from the gas ring (20) and is formed of brass. Welding device after Claim 2 in that the mouthpiece (30) extends circumferentially around the outside of the gas ring (20) and is made entirely of brass. Welding device according to one of the preceding claims, wherein the end portion (32) of the mouthpiece (30) and the gas ring (20) form a common cylindrical gas space (22). Welding device according to one of the preceding claims, wherein the gas guide channels (24) at an acute angle (α) inclined to the joining axis (F) and with a diameter (D) of at least 3 mm to the gas space (22) facing gas outlet openings (26) , Welding device according to one of the preceding claims, wherein the gas ring (20) has a plurality of gas guide channels (24) which are circumferentially distributed symmetrically. Use of a welding device (1) according to one of the preceding claims for the arc welding of spherical elements to a vehicle component.

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