JPH0683900B2 - Spatter adhesion prevention welding torch nozzle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to improvement of a torch nozzle of a gas seal welding apparatus, and more particularly to a spatter adhesion preventing welding torch nozzle having a surface subjected to spatter adhesion preventing treatment. .

[Conventional technology]

Conventional gas-seal welding torch nozzles are so-called calorizing and chromizing treatments in which a coating layer is formed by diffusing and penetrating aluminum or chromium on the surface of a copper nozzle substrate, or hard chromium plating is applied to the surface. What you have done is provided. However, if spatter adheres to the tip of the nozzle and becomes clogged, the outflow of the shield gas is impeded and air enters the deposited metal, causing defect welding due to oxidation and nitriding phenomena. Further, the torch nozzle and the welding rod, which are originally electrically insulated, are short-circuited due to the adhesion of spatter to generate a spark, which damages the surface of the torch nozzle, and the damage further promotes the adhesion of spatter. Therefore, it is necessary to regularly stop the welding work and remove the spatter. Particularly in an automatic welding machine that controls and welds a large number of welding points at the same time, adhesion of spatter to the tip of the torch nozzle, which is an obstacle to improving work efficiency, is the greatest problem to be solved.

On the other hand, some welding torch nozzles whose tip is made of ceramics with excellent heat resistance and sliding property are also used.
Although spatter adhesion can be relatively prevented, the manufacturing process such as firing at high temperature is complicated and expensive.

Therefore, it has been desired to develop a torch nozzle for welding, which is inexpensive and prevents spatter from adhering extremely, and which prevents spatter from adhering.

[Problems to be solved by the invention]

In view of the above situation, the present invention is to solve the problems by subjecting a conventional metal nozzle base material to a surface treatment to improve the slipperiness of the nozzle surface to prevent spatter from adhering to the extreme and adhering. Another point is to provide an inexpensive and highly durable spatter adhesion preventing welding torch nozzle that can be easily peeled off by its own weight.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a sputter deposition in which a composite plating layer in which nickel and a fluorinated polymer compound are co-deposited by plating is formed on the surface of a metal torch nozzle for gas seal welding. An anti-welding torch nozzle was constructed.

It is a preferred embodiment that the composite plating layer is formed on the chrome layer formed by hard chrome plating on the nozzle surface. Here, as the fluorine-based polymer compound, one or more selected from polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, and tetrafluoroethylene-hexafluoropropylene copolymer are used, Further, it is particularly preferable that the composite plating layer has a thickness of several μm to 30 μm.

[Action]

The spatter adhesion-preventive welding torch nozzle of the present invention having the above contents is a fluorine-containing metal torch nozzle, which is formed by forming a composite plating layer in which nickel and a fluorine-containing polymer compound are co-deposited by a plating treatment. Due to the low friction property of the polymer itself, the molten metal that scatters from the arc generation part, that is, spatter is prevented from adhering to the tip of the nozzle, and even if it adheres it has a good sliding property, so the self-weight of the molten metal It can be easily peeled off. As a result, the residence time of the molten metal at the nozzle tip portion is shortened, heat transfer from the molten metal to the nozzle tip portion is small, and furthermore, a metal nozzle having good thermal conductivity is used, and the composite plating layer is nickel. As a matrix, the fluorine-containing polymer compound is in a dispersed state and the thermal conductivity is relatively good, so due to the shielding gas flowing inside,
Further, in a torch nozzle accompanied by water cooling, the cooling water quickly cools the heat so that heat is not concentrated, the temperature rise in the torch nozzle is small, and the composite plating has a fluorine-containing polymer compound that melts at a lower temperature than metal. There is also less thermal damage to the layers.

〔Example〕

Next, the details of the present invention will be described based on the embodiments shown in the accompanying drawings.

FIG. 1 is an abbreviated cross-sectional view schematically showing a use state of a spatter adhesion preventing welding torch nozzle according to the present invention, in which a substantially cylindrical metal torch nozzle 1 has a central portion and a nozzle tip portion 2 in order. The welding rod 3 to be sent out is arranged, and an arc 6 is generated between the tip of the welding rod 3 and the joint portion 5 of the welded objects 4, 4 to melt the tip portion of the welding rod 3 to form the joint portion 5.
It is sequentially supplied to the melting part 7 and welded. Then, a shield gas 8 such as carbon dioxide gas, argon, helium, or the like is directed from the inside of the torch nozzle 1 toward the nozzle tip portion 2 direction.
The arc 6 and the melting part 7 are ejected from the air by
Is completely shut off to prevent defect welding due to oxidation and nitriding of the molten portion 7, and the arc 6 is stably generated in the atmosphere of the shield gas 8. In this case, the molten metal is scattered from the melting part 7 by the impact of the arc 6,
That is, a phenomenon occurs in which spatter occurs and the spatter 9 collides with the inner and outer surfaces of the nozzle tip portion 2.

Therefore, the present invention forms a composite plating layer 16 in which nickel and a fluoropolymer compound are co-deposited on the surface of the metal torch nozzle 1 for gas seal welding by plating to prevent adhesion of spatter. The main point is to become.

FIGS. 2 (a) and 2 (b) respectively show cross-sectional structures of the surface obtained by subjecting the metallic nozzle substrate 10 to a surface treatment for preventing spatter adhesion.

First Example As shown in FIG. 2 (a), one kind selected from polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, and tetrafluoroethylene-hexafluoropropylene copolymer in a nickel plating solution. Alternatively, the nozzle base material 10 is prepared by using a plating solution in which two or more kinds of fluorine-based polymer compound fine particles 14 are dispersed with a surfactant.
The surface of is plated and nickel 15 and fluorine-based polymer compound fine particles 14 are co-deposited to form a composite plating layer 16.
The composite plating layer 16 is in a state in which the fluorine-based polymer compound fine particles 14 are dispersed in nickel 15 and the thickness thereof is set to several μm to 30 μm. Further, the content of the fluorine-based polymer compound fine particles 14 in the composite plating layer 16,
It is set to 10 to 40% by volume, more preferably 15 to 25% by volume.

Second Embodiment As shown in FIG. 2 (b), the surface of the nozzle substrate 10 is plated with hard chrome to form a chrome layer 17, and the fluorine-based polymer compound shown in the second embodiment is formed thereon. A composite plating layer 16 of fine particles 14 and nickel 15 is formed.

Among the examples described above, the surface of the metal nozzle substrate 10 shown as the second example is plated with hard chrome, and the fluorine-based polymer compound fine particles 14 and nickel are deposited on the surface.
A comparative experiment between a torch nozzle 1 that has been subjected to surface treatment to form 15 composite plating layers 16 and a torch nozzle that has been subjected to chromizing treatment, calorizing treatment and hard chrome plating treatment on the surface of a conventional metal nozzle substrate 10 respectively. The results are shown below.

3 to 7 show the torch nozzles 1, ... Under the same use conditions.
6A and 6B are external views comparing the attachment states of the spatter 9 to the nozzle tip 2 of FIG. 3, FIGS. 3A to 5A are side views of the conventional torch nozzle 1, and FIG. 6 and 7 are side views of the torch nozzle 1 of the present invention.

Samples FIGS. 3 (a) and 3 (b) show a state after using a torch nozzle in which the surface of a nozzle base material 10 made of copper has been subjected to a conventional chromizing treatment. According to this, the spatter 9 is firmly attached to the nozzle tip 2 and its inner surface,
Even after the torch nozzle 1 is cooled, the spatter 9 is not easily peeled off, and it is difficult to completely remove it with pliers or nippers, and the surface state of the nozzle tip portion 2 is slightly deteriorated.

Samples FIGS. 4 (a) and 4 (b) show the state after use of a torch nozzle in which the surface of the nozzle base material 10 made of copper has been subjected to conventional calorizing treatment. According to this, the sputter 9 adheres to the nozzle tip 2 and its inner surface similarly to the sample, and the spatter 9 is easily peeled off compared to the sample, but the surface of the nozzle tip 2 after peeling is the nozzle base. The copper of the material 10 appears, and countless minute recesses are formed on the surface of the torch nozzle 1, which means that the surface treatment is destroyed.

Samples FIGS. 5 (a) and 5 (b) show a state after use of a torch nozzle in which a conventional hard chrome plating is applied to the surface of a nozzle base material 10 made of copper to form a chrome layer having a thickness of 20 μm. Is. According to this, similarly to the sample, the spatter 9 is firmly attached to the nozzle tip 2 and its inner surface, and the nozzle tip 2 is melted and damaged, and the spatter 9 adheres to the nozzle tip 2 and the welding rod 3. Means that a spark has occurred due to a short circuit, and the side surface of the torch nozzle 1 is discolored by heat due to high temperature.

Sample FIG. 6 shows a state after the use of the torch nozzle in which the surface of the nozzle base material 10 made of copper has been subjected to the surface treatment shown in the second embodiment of the present invention. This surface treatment is a nozzle substrate
Hard chromium plating is performed on the surface of 10 to form a chromium layer 17 having a thickness of 20 μm, and fluorine-based polymer compound fine particles 14 are formed on the chromium layer 17.
And nickel 15 are codeposited to form a composite plating layer 16 with a thickness of 8 μm
And the content of the fluorine-based polymer compound fine particles 14 in the composite plating layer 16 is about 20% by volume, the strength and thermal conductivity of the metal plating and the low friction property of the fluorine-based polymer compound are obtained. Be prepared. According to this, the outer surface and the inner surface of the nozzle tip portion 2 after use have no adhesion of the spatter 9 and retain the gloss before use, and the treated surface is not deteriorated at all. It should be noted that the sputter 9 is temporarily adhered to the inner surface of the nozzle tip 2 during use, but the sputter 9 immediately
It easily peeled off due to its own weight.

Sample FIG. 7 shows a state after the use of the torch nozzle subjected to the same surface treatment as the sample except that the thickness of the composite plating layer 16 was 15 μm. According to it, the outer surface of the nozzle tip portion 2 after use has no adhesion of the spatter 9 at all like the above-mentioned sample, and retains the gloss before use,
Almost no degradation of the treated surface has occurred. It should be noted that the spatter 9 temporarily adheres to the inner surface of the nozzle tip portion 2 during use, but the sputter 9 also immediately peels off due to its own weight. However, the peelability is slightly inferior to that of the sample, and the surface condition of the inner surface is slightly deteriorated.

Then, as a result of a comparative experiment of the above-mentioned respective samples under the same conditions, in the conventional welding torch nozzle 1 corresponding to the samples 1 to 3, the spatter 9 is firmly adhered to the nozzle tip portion 2 thereof, and the spatter 9 is easily peeled off. Not only that, but also the surface condition of the torch nozzle 1 is greatly deteriorated and the condition before use is not stopped, and further, a part of the nozzle base material 10 is exposed or melted and the adhered spatter 9 is removed. However, the surface condition is not such that it can be reused, and even if it is reused, the spatter 9 adheres more strongly and cannot be used in a short time. On the other hand, in the welding torch nozzle 1 of the present invention corresponding to the sample and, the spatter 9 is not attached to the nozzle tip portion 2 at all, and even if it is temporarily attached to the inner surface, the spatter 9 is easily peeled off by its own weight. Because only
The heat transfer from the sputter 9, that is, the molten metal, to the torch nozzle 1 is small, that is, the temperature rise of the torch nozzle 1 is small, and therefore the surface is hardly deteriorated.

In addition, as described above, the spatter 9 is formed on the surface of the torch nozzle 1.
However, since the temperature of the torch nozzle 1 hardly rises, it is possible to use iron having a low unit price without using copper, which has particularly high thermal conductivity, as the nozzle base material 10.
In addition, comparing with the sample, the composite plating layer 16
It can be seen that the sample having a smaller thickness is slightly superior, but it is presumed that this is because the thermal conductivity from the composite plating layer 16 to the nozzle base material 10 via the chromium layer is good. Even if the thickness of the composite plating layer 16 is made thicker, the effect of preventing the spatter 9 from adhering is not improved correspondingly only by using a large amount of plating solution.
On the other hand, when the thickness is about several μm or less, the strength of the composite plating layer 16 is weak and it is difficult to control the thickness in the plating process, which is not practical. Therefore, the composite plating layer 16 is several μ
It is preferable to form it with a thickness of m to 30 μm.

〔The invention's effect〕

According to the spatter adhesion-preventing welding torch nozzle of the present invention as described above, the surface of the metal torch nozzle for gas seal welding is provided with a composite plating layer in which nickel and a fluoropolymer compound are co-deposited by plating. Since it is formed, the surface of the torch nozzle can be made to have a high slidability of molten metal, that is, spatter due to the low friction property of the fluorine-based polymer material itself, and as a result, it is scattered from the arc generation part. It is possible to prevent the spatter from adhering to the tip portion of the nozzle, and even if it is temporarily adhering, it can be easily peeled off due to the weight of the spatter. Moreover, since the residence time of the sputter at the nozzle tip is short, heat transfer from the sputter to the nozzle tip is small, and a metal nozzle having good thermal conductivity is used, and the composite plating layer uses nickel as a matrix. Since the fluorine-containing polymer compound is dispersed in the inside and the thermal conductivity is relatively good, heat is easily transmitted through the metal nozzle and diffused so that heat is not concentrated, that is, the temperature rise of the torch nozzle is small, As a result, thermal damage to the composite plating layer having a fluorine-containing polymer compound that melts at a lower temperature than that of metal can be suppressed to a minimum, and durability can be improved.

[Brief description of drawings]

FIG. 1 is an abbreviated sectional view schematically showing a use state of a torch nozzle for preventing spatter adhesion welding of the present invention, and FIGS. 2 (a) and 2 (b) are portions schematically showing a surface treatment state of the torch nozzle. Cross-sectional views, FIGS. 3 to 7 show the sputter adhesion state after use of a torch nozzle subjected to various surface treatments, and FIG. 3 (a) shows the spatter adhesion state of a conventional torch nozzle subjected to a calorizing treatment. FIG. 3B is an enlarged perspective view of the tip portion of the torch nozzle of FIG. 3A, and FIG. 4A is a side view showing a spatter adhesion state of a conventional torch nozzle subjected to chlorizing treatment. FIG. 4 (b) is an enlarged perspective view of the tip portion of the torch nozzle of FIG. 4 (a), and FIG. 5 (a) is a side view showing the spatter adhesion state of a conventional hard chrome-plated torch nozzle. (B) is FIG. 5 (a) is an enlarged perspective view of the tip portion of the torch nozzle, FIGS. 6 and 7 show the sputter adhesion state after the use of the surface-treated torch nozzle of the present invention, and FIG. 6 shows the nozzle substrate surface. Fig. 7 is a side view of a torch nozzle in which a 20µm thick chromium layer is formed on top of which a 8µm thick composite plating layer is formed, and Fig. 7 shows a 20µm thick chromium layer formed on the nozzle base material surface. It is a side view of a torch nozzle in which a composite plating layer having a thickness of 15 μm is formed. 1: Torch nozzle, 2: Nozzle tip part, 3: Welding rod, 4: Welded product, 5: Joined part, 6: Arc, 7: Molten part, 8: Shield gas,
9: Sputter, 10: Nozzle base material, 14: Fluorine-based polymer compound fine particles, 15: Nickel, 16: Composite plating layer, 17: Chrome layer.

Claims (4)

[Claims] 1. A spatter adhesion-preventing type, characterized in that a composite plating layer in which nickel and a fluorine-containing polymer compound are co-deposited by plating is formed on the surface of a metal torch nozzle for gas seal welding. Welding torch nozzle. 2. A torch nozzle for spatter adhesion prevention welding according to claim 1, wherein the composite plating layer is formed on a chrome layer formed by hard chrome plating on the nozzle surface. 3. As the fluorine-based polymer compound, polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-
The spatter adhesion preventing welding torch nozzle according to claim 1 or 2, which comprises one or more selected from hexafluoropropylene copolymers. 4. The thickness of the composite plating layer is several μm to 30 μm.
The spatter adhesion preventing welding torch nozzle according to claim 1 or 2.