FI109003B - Device for improving special working and fire safety in protective gas welding - Google Patents

Description

109003 Arrangement especially for improving occupational and fire safety in shielded gas welding

The invention relates in particular to an arrangement for improving occupational and fire safety in shielded gas welding using a welding apparatus comprising a welding device, a shielding gas unit and a handpiece nozzle connected to the welding device via a conduit, wherein the welding wire is arranged in The welding apparatus further comprises, in particular, for improving the operational and fire safety of the welding process, firstly, a switching arrangement for supplying the shielding gas supplying the welding current to the nozzle portion and conducting the shielding gas at a substantially higher flow rate than the welding event, preferably via a conduit unit through the nozzle portion, and, on the other hand, a discharge arrangement for removing the welding gases; 25, by sucking it substantially from the nozzle connection: by a suction channel and / or, ··· provided by a suction device such as a vacuum, fan and / or similar, to the conduit unit and / or nozzle member I · j. suction system.

30 »

The welding method of the type described above corresponds e.g. TIG welding, which is widely used e.g.

'·· * for thin sheet metal welding, such as in garages. It is also possible to utilize the type of work described above 35 in the so-called. In connection with MIG welding, the welding machine further comprises at least a wire feed unit and means for adjusting the wire feed speed: · *. In this case, the supply of the welding wire from the wire feeder 1 * 109003 2 through the nozzle part to the welding point is also arranged via a flexible conductor unit.

Finnish Patent Publication Number FI98438 and Application Publication DE 3 404 614 disclose solutions of the above type, in particular for improving the operational and fire safety of the welding process.

From the above, it is known that a shielding gas 10 is supplied to the sensitive / flammable location mainly in the so-called. Preferably, actuators acting from the shielding gas unit of the MIG welding apparatus through the nozzle member are actuated by an operating switch in connection with the nozzle member, interrupting the welding current and welding wire and switching the shielding gas flow through the nozzle At present, there are also advanced welding equipment for occupational safety, in which it is possible to remove welding gases by suction through a 2 0 nozzle part by means of a vacuum connected to a suction duct integrated in the control unit.

Neither of the aforementioned publication FI98438 or DE

V. 25 3 404 614 does not specifically state:. ♦ · · • «· ·: very inexpensive in terms of manufacturing costs •» ·. ' • I · solutions, since both of these require first and foremost • • · · · · · · · · · · · · · · · · · · · · · 30 30 30 30 30 30 30 30 30 30 30 30. This, of course, often requires »· '··' cooperation with welding equipment manufacturers, which tends to increase the cost of manufacturing equipment in practice. In addition, in this type of solution, »» · •: it is very difficult to make existing welding equipment 35 safer in accordance with the above solutions.

I {t »3 109003

On the other hand, Finnish Patent Application No. 970758 discloses an improved solution specifically addressing the aforementioned problems, based on the fact that the flow arrangement 5 of the switching arrangement is implemented flow-substantially substantially outside of the welding device the nozzle portion.

The advantage of this solution is the simplicity of its technical implementation, which also allows existing welding equipment to be configured with greater safety with very simple additional installations. Thus, the prevention of a fire situation can be implemented very quickly as an advantageous application by simply using the operating switch in the nozzle part, whereby the actuators connected thereto, for example in MXG welding 20, interrupt the operation. in the case of shielding, the welding current supply and the wire feed to the nozzle part, and in conjunction with this, connect a larger shielding gas flow to the nozzle part than the welding situation.

: 25 With regard to the welding arrangement of that patent application 970758, its indisputable advantages and. , since they are sized in practice to meet the requirements of the welding lance. Therefore, the actual -. * ·. In such a shielding situation, very high flow rates must be used to ensure sufficient extinguishing • power, causing both pressure loss and sound problems.

109003 4

The present arrangement, in particular for improving occupational and fire safety, is intended to eliminate the above-mentioned problems in the shielding gas welding and thus to substantially increase the state of the art in the field. To accomplish this purpose, the arrangement according to the invention is characterized in that the arrangement comprises means for conducting the shielding gas at least partially through the suction passage and / or suction arrangement in the outlet unit and / or nozzle part of the arrangement.

The main advantages of the arrangement according to the invention are its simplicity and efficiency, whereby, with a very small additional installation, any existing welding equipment with an integrated discharge arrangement can also be supplemented with an effective fire prevention arrangement. This is in particular due to the fact that, when the shielding gas 20 is passed through the suction passage of the outlet arrangement in the shielding situation, the maximum cross-sectional area of the conduit unit and nozzle portion is available for the shielding gas supply. In this case, it is possible to arrange the production of the shielding gas optimally in the shielding situation. 25 si, while minimizing pressure losses and • ·; ·. On the other hand, the invention · · · '! *! First, it is possible to vary the arrangement according to • · · [such that the shielding gas supply flow system; The position of the lynx and the suction system '···' 30 which removes the welding gases is rotated relative to the conventional embodiment »* · so that the suction arrangement is conducted inside the shielding gas. On the other hand, the • · arrangement according to the invention is implemented in such a way that, in the case of shielding gas, both • φ · t · * .35 the shielding gas flow path and the suction duct! .. * are used. in the sense that welding- | * / the effect is enhanced because the flue gas formed during welding is sucked as close as possible to the point where it is produced and, on the other hand, in that the welding site is completely surrounded by a shielding gas.

In this case, the yield of the shielding gas 5 in the shielding situation is maximal because the cross-sectional area used for it is the widest possible in both the conduit unit and the nozzle part.

Advantageous embodiments of the arrangement according to the invention 10 are described in the dependent claims.

In the following description, the invention will be illustrated in detail with reference to the accompanying drawings, in which Fig. 1 illustrates a preferred embodiment of the arrangement of the invention, Figs. 2a and 2b show longitudinal sections of some preferred embodiments of the arrangement. a system according to the invention is shown. advantageous detail in connection with the nozzle part i 30 shown in longitudinal section.

The invention relates in particular to an arrangement for improving occupational and fire safety in the use of a shielded gas welding apparatus comprising a 35 welding device 1, a shielding gas unit 4 and a nozzle portion 3 connected to the welding device 1 via a conduit 2, whereby the welding wire L is V * provided with a trigger B in the nozzle part 3 using a 1 * i »· 6 109003 arc connected to the nozzle part 3 for melting at the welding site shielded from the shielding gas unit 4. The welding apparatus further includes, in particular, for improving the operational and fire safety of the welding event, firstly, a switching arrangement X for guiding the gas from triggered to interrupt at least the flow of welding current to the nozzle member 3 and to conduct the shielding gas at a substantially higher flow rate than the welding event, preferably via conduit 2 via nozzle member 15; 5b by a coupled suction device 8, such as a vacuum, fan or the like, through a suction duct 5a and / or suction arrangement 5a 'integrally arranged in the conduit unit 2 and / or nozzle part 3 20. The arrangement according to the invention comprises means for conducting a shielding gas, at least partially, in the shielding unit 2 and / or in the nozzle part 3, a suction channel 5a and / or a suction arrangement 5a1 · /; through.

1 and 2a * t,! .. * preferably includes a control unit C, preferably arranged in connection with the conductor unit 2 3 0, for a protection situation, which is intended firstly for the suction flow. to stop it in the suction duct 5a and / or in the suction arrangement 5a 'and, on the other hand, to supply the shielding gas to 9 I *' ,,, ·.

35 i ·, * ',: In this connection, the control unit C is arranged (·. Preferably at the connection I of the welding device 1 2 2 of the wire unit 2 and in connection therewith t 11 »» »

»I

7 109003 to control its operation, such as, in its simplest form, a shielding gas trigger switch xl for nozzle member 3.

With particular reference to Figure 2a, the control unit C is

arranged to interrupt the operation of suction apparatus 8, such as a vacuum, fan or the like, to interrupt the suction flow of suction channel 5a by means of valve arrangement 6 such as shut-off valve 6a 10 and / or similar opening. The foregoing may be further accomplished simply by automatically executing all of the listed operations in the correct order on the basis of the principle shown in Fig. 2b, using control switch x1.

Referring further to the preferred embodiment shown in Fig. 2b, control means 7 are provided at the connection of the nozzle part 3, such as the nozzle neck 3a, for controlling flow through the suction duct 5a and / or the suction arrangement 5a ', such as a bypass flow control valve 6c.

, '·· With particular reference to Figure 3, there is a welding situation; the nozzle arrangement 4c of the shielding gas flow and the suction arrangement 5a 'of the exhaust arrangement 5 implemented in particular in the nozzle part 3 by radially overlapping structures. In this case, a preferred embodiment of the invention is ..._ preferably a suction channel 5a in the conduit unit 2 ;;; that the associated suction arrangement 5a 'at the outer end of the nozzle part 3 ·; · is positioned internally relative to the welding 35 in the conduit unit 2 to the shielding gas supplying ·: ··: the flow path and the shielding gas supplying nozzle arrangement 4c; 109003, through a conduit unit 2 and a nozzle member 3, through both the flow path for the shielding gas and the nozzle arrangement 4b, 4c and the suction duct and suction arrangement 5a, 5a 'of the outlet arrangement 5. One of the bases for this 5 application is, in particular, experimental knowledge that flue gas formation is most pronounced when hot sparks from the welding point are directly exposed to the open air. This problem can be effectively minimized in the manner described above, because firstly, the suction provided by the suction arrangement is directly directed at the welding site, and in addition both the welding site and the above suction arrangement are completely surrounded by the shielding gas at the welding site.

15

It is to be understood that the invention is not limited to the embodiments described or described above, but can be very substantially modified within the scope of the basic idea of the invention. It is first of all clear that the simple principle of the invention can also be applied to other types of welding using almost any shielding gas in one form or another, and in addition to an outlet arrangement, both of which are substantially via conduit and / or nozzle. Of course, it is · possible to arrange the actuators of the switching arrangement to operate by means of a pressure medium, using some kind of mechanical, e.g. 30 using radio frequency components, for example. However, the reliability of these may ... be practical applications. traditional ;;; · is more insecure and requires much more maintenance and servicing than traditional solutions. In addition, the actuators and actuators of the arrangement according to the invention can, of course, be integrated into the same regulator or be implemented by, e.g.

Claims (6)

1. Apparatus for improving especially the working and fire safety of protective gas welding using a welding device, which includes a welding apparatus (1), a protective gas unit (4) and a hand-pourable nozzle part (3), which is connected to the welding apparatus ( 1) through a conduit unit (2), wherein the welding tree (L) is arranged to be melted in conjunction with the nozzle part (3) through a light beacon on one with the shielding gas, which has been led to the welding point from the shielding gas unit (4), protected manner, and which welding device further belongs specifically to improve the working and fire safety of the welding event, first and foremost a coupling device (X) for directing the protective gas from the protective gas unit (4) under a protective situation to a point which is under fire danger / which burns, by means of of operating means which is arranged by means of a switch (X1) preferably arranged in connection with the nozzle part (3), such as a n pushbutton or the like, arranged to interrupt at least the input of the welding current to the nozzle portion (3) and to conduct the shielding gas with a substantially larger flow volume · than during the welding event, preferably through the mediation of the conduit unit (2) and (3) on the other hand, a removal device (5) for. ···, substantially in connection with the nozzle portion (3) by employing a suction device (8), such as one, a sucker, a blaster or equivalent, by mediating a suction channel (5a) and / or suction device (5a '), which ··· * is arranged in an assembled manner in the conduit unit (2) and / or in the nozzle part (3), characterized in that the device belongs to means for conducting the protective gas. during a protective situation, at least partially through the suction duct (5a) and / or the suction device (5a) contained in the conduit unit (2) and / or in the nozzle part (5a), which belongs to the removal device (5). ). 2. Device according to claim 1, characterized in that the said means includes a control unit (C) arranged in conjunction with the control unit (2) for the protection situation, first and foremost to stop the suction flow in the suction duct (5a). and / or in the suction device (5a ') and on the other side to feed the protective gas into the same / the same. Device according to claim 1 or 2, characterized in that the control unit (C) is arranged in connection with the end (I) of the wiring unit (2), which is to be connected to the welding apparatus (1), and those in contact with the same, its function controlling drive means (C ') in the nozzle part (3). Device according to any one of the preceding claims 1-3, characterized in that the control heat (C) is arranged under a protective situation to interrupt the function of the suction device (8), such as a suction, a blaster or equivalent, to interrupt. The suction flow in the suction duct (5a) through a valve device (6), such as by closing a stop valve (6a) and / or the corresponding, to guide the protective gas thereafter to the suction duct (5a) by means of a suction duct (5a). connected to the inlet pipe (4a) with the protective gas unit (4). by opening a corresponding functional valve (6b). • Device according to any of the above claims 1 to 4, characterized in that, in connection with: the nozzle part (3), as well as in the nozzle body (3a) 35, regulating means (7) are arranged for regulating in '. the suction channel (5a) and / or in the current flowing suction device (5a '), such as a control valve (6c) operating or bypass principle, or equivalent. I 109003! 15 Apparatus according to any one of the preceding claims 1-5, in which nozzle device (4c) of the protective gas flow of the welding situation and the suction device (5a ') of the removal device (5) has been realized, in particular in the radial direction of the nozzle part (3), on top of each other. characterized in that the suction duct (5a) and the suction device (5a ') connected to the outer end of the nozzle (3a) are positioned internally in relation to the flow path (4b) which enters the protective gas during a welding situation, and the nozzle device (4c) ), wherein the protective gas is arranged to be conducted during the protective situation by mediating the conduit unit (2) and the nozzle part (3) via the bed flow path and the nozzle device (4b, 4c) intended for the protective gas, and the removal device (5). the suction duct and the suction device (5a, 5a '). i • · • · * * «« • · • · · • I:> · · • ♦ ♦ · * • «« • · • · »t · • ·» · · «» ♦ * *