JPS5841693A - Anti-sticking agent for spatter for nozzle and tip of welding torch, jig or the like - Google Patents

Abstract

PURPOSE:To provide a high effect of preventing sticking of spatters on the nozzle, etc. of welding torches by consisting a titled agent of a solvent having specific b.p. and solid lubricant powder. CONSTITUTION:A solvent having 130-300 deg.C b.p. such as butyl cellulosolve, cyclohexanone or the like and boron nitride as solid lubricant powder are used as essential components, and a solvent which evaporates preferentially to the solvent of 130-300 deg.C b.p. is compounded with said components. Such compound is coated on the nozzle and tip of welding torches and jig, etc. and in the stage of coating, the volatile solvent is allowed to evaporate preferentially, thereby forming the coating layers substantially of the solvent of 130-300 deg.C b.p. and the solid lubricant powder. After the solvent of 130-300 deg.C b.p. evaporates by arc heat, the deposited layer of the solid lubricant powder is dense and firm and retains the effect of preventing sticking of spatters.

Description

[Detailed description of the invention] Uninvented welding torch nozzle, tip, and jig-1
1-1-2 Agents for preventing sputter adhesion to surfaces.

The 1-1 objective is to provide one-on-one compositions that exhibit extremely excellent spatter-proof properties for welding torch nozzles and the like.

Normally, when shielding gas is used once a month in consumable polar arc welding, the droplet transfer format varies depending on the selected welding conditions, and there are various forms from short-circuit transfer to spray transfer. In particular, spatter is often generated in the case of short-circuit transfer or globular transfer, but spatter is also less likely to occur in argon gas shield or argon + carbon dioxide shield welding, but these spatters are caused by contact chips during long welding operations. It accumulates on the tip of the consumable electrode wire and on the gas discharge hole of the gas shield nozzle, obstructing the delivery of the consumable electrode wire, and making it easy to cause disturbances in current, voltage, etc. due to unstable feeding.

In addition, if the amount of spatter deposited in the gas shield discharge hole becomes large enough to block the discharge hole, it is natural that the shielding effectiveness of the arc column and molten pool will be drastically reduced, but it will not be so great because of the Q product with a small σ. The gas flow changes from a laminar flow to a turbulent flow, resulting in a poor shielding effect and the introduction of air, etc., which deteriorates the quality of the solution section.

In particular, when the contact I/tip part or the gas nozzle part is inserted and welded into a narrow and deep groove, the arc heat and the heat retained by the molten metal and molten TV metal cause the welding
-Chi? From 6 onwards, the amount of spatter tends to increase. When a person places a narrow torch in a narrow groove and runs and tightens the arc point, it is normal for an arc to occur between the welding wire and the welded object. If there is a level difference between the torch body or the accumulated spatter, and it comes into contact with the spatter being welded,
'Problems such as the generation of unusual arcs occur.

Even in the non-consumable electrode type arc welding method, the gas nozzle part and the contact tip TfIK are placed inside the narrow gap mentioned above.
If the material is at the same potential as the pole part, it may come into contact with the material to be welded, causing a risk of arc generation due to the potential difference with the material to be welded.

Of course, metal vapor was generated on the inner surface of the gas nozzle when it was in contact with the gas nozzle for a long time at 7F (after 1 frF), and there was a mistake in the operation of the filler metal during welding work.
If there are droplets due to 'H7x, etc., the shielding gas flow J'1 as in the previous example. This may disturb the flow and cause defective welding.

Furthermore, robots and fully automatic welding have rapidly developed in recent years, but
7i''l could not fully fulfill these functions, which was a major obstacle to automating the welding line.

In order to resolve this problem in the conventional gas shielded arc welding method, attempts have been made to create a rainproof method to prevent spatter from adhering to the contact tip and gas nozzle.

In other words, we will try to use strong cooling to keep the temperature of the contact tip as low as possible, use a material with a large thermal diffusion coefficient, or use a material with an extremely high #lt point once a month. 4.1 (this is the basic idea of the 1qC decision that has been made) For example, the torch part including the contact tip for welding is made of copper or its alloy, and there are many structures that are strongly cooled by water cooling etc. from the inner and outer bars 1ζ. -ψ, but when it comes to spatter resistance, it is inevitable that during long welding work, the phenomenon of deposition preferentially occurs around the tip of the contact tip and the wire delivery hole. It is also technically difficult to provide such information, leading to phenomena such as the old-fashioned nature of stock exchange becoming even more pronounced.

It is also known that high-boiling point metals and sintered alloys are used for contact tips, but it is difficult to create holes through which wires can pass, and it is difficult to insulate when used as a contact tip. Therefore, when used in a narrow gap, a gap j1 IC1 is left in the arc-resistant column.

In addition, graphite, zinc fluoride, tungsten disulfide,
In some cases, a mixture of a powder of a layered crystal lattice structure material such as flE molybdenum, an organic solvent solution containing an organic bond, or an aqueous solution of an inorganic binder is applied to the welding area. However, in this case, due to the occurrence of 1';l spatter, the spatter sinks into the film and a large amount of spatter adheres, and the function of the solid d'-1 lubricant powder is not fully exhibited.

This phenomenon is particularly noticeable in carbon dioxide gas bath welding, and in the case of automation, welding with a continuous arc time of 5 minutes or more is desired, but conventional methods often do not yield satisfactory results.

The present invention uses solid or adhesive substances such as synthetic resins, colloidal silica surfactants, waxes, etc.
Abandoning the conventional idea of fixing the IMf agent powder, the solid lubricant powder is temporarily fixed with a high boiling point solvent that should volatilize away, and: '+''fl ?JH After the point solvent has volatilized, Yes, solid lubricant powder can be firmly fixed to such a degree that it will not fall off due to vibration or gas flow, and this solid lubricant powder in a firmly squeezed state has an excellent spatter f-1 adhesion prevention effect. Through this research, we have arrived at the present invention.

Uninvented, the essential components are a solvent with a boiling point of 130 to 300°C and a solid lubricant powder.'1. stomach:! 1. Welding torch nozzle, tip, and treatment This relates to sputter adhesion prevention agents such as the following.

In the present invention, as a solvent with a boiling point of 130 to 1"C, there are the following 6ml.

They can also be used together.

Butyl cellosolve, NIIN dimethylforno, amide,
Cyclohegisanone, Quizylol, N-N dimethylacetamide, 1.2-globandiol, dimethyl sulfoxide, N-N dimethylaniline, 1.2, ethanediol, N-methylpyrrolidone, benzyl alcohol, formamide, acetamide, diethylene glycol, glycerin, If a solvent with a temperature below 130° C. is used, the deposited layer of solid Il^1 lubricant powder becomes brittle and easily falls off. On the other hand, the boiling point is 3
If the temperature of the solvent exceeds 00°C, evaporation due to arc heat will be slow and tackiness will increase, making it easier for spatter to adhere. Therefore, it is desirable that the boiling point of the solvent in the present invention is 180 to 300°C.

At first, a solid lubricant powder is applied to a solvent with a boiling point of 180~AOO''C for 1~7J to activate a welding torch nozzle, but it gradually evaporates due to arc heat.

After that, 1 leaves a layer of 4"t) thick solid lubricant powder that does not peel off due to vibration or gas flow.

In the present invention, the solid lubricant F1F agent powder refers to a material with a layered crystal lattice structure whose crystal structure is cleaved, such as powder of boron nitride, graphite, molybdenum disulfide, tungsten disulfide, etc., which can be conveniently mixed by appropriately mixing them. You can also do it once a month.

Such a solid lubricant powder can easily cleave into layered crystals and exhibit lubricating properties.

The desired coating can be achieved by any coating method such as brush coating on jigs, dipping, spraying with a spray gun, aerosol filling, etc.

Here, the coating layer means a skin 111iS consisting only of a solvent with a boiling point of 130 to 300°C and solid lubricant powder.

To form this coating layer, it is possible to use a diluted and dispersed material of f+I with a volatile solvent as described in Section 2 of the patent application. That is, the boiling point is 180-30
By blending a solvent that volatilizes more preferentially than a solvent at 0°C,
During coating, this volatile solvent is preferentially evaporated to form a coating layer.

Examples of volatile organic solvents include chlorinated organic solvents such as trichloroethane, alcohol-free solvents such as methanol and ethanol, fluorine-based vinegar, brominated organic solvents, and ethyl acetate. Examples include ester-based organic solvents such as ester-based organic solvents, ketone-based organic solvents such as methyl ethyl ketone, and low-boiling aromatic organic solvents such as benzene.

In this case, even if volatile solvents are mixed, the volatile solvents dry preferentially and have a boiling point of 130 to 80 (1"C).
Solvent and solid d? - A coated layer of lubricant powder is formed.

Next, the solvent having a boiling point of 130 to 300°C is evaporated by the arc heat.

J: sea urchin substantially has a boiling point of 180 to 300°C 11
11 and solid 41゛'' To redden the coating layer consisting only of lubricant powder, after the solvent with a boiling point of 130 to 300°C evaporates, solid lubricant powder is deposited. This means that the rainproof effect will last longer.

If the sputter collides with such a coated layer or solidified lubricant powder, the solid lubricant will cleave or
Alternatively, self-peeling occurs to prevent spatter adhesion.

This is an undesirable effect when solid lubricant powder is fixed with a binder such as an organic or inorganic solid or a binder. He was able to prevent the 471st coat of Nurikomi Spanter from being stolen.

If a solvent with a boiling point of 130 to 300°C is used for temporary caking that completely volatilizes as in the present invention, it will not fall off due to vibration or gas flow (111 degrees), forming a dense coated layer and solidifying it. It is thought that this effect is fully exhibited because the ff1H°I?ff agent powder is easily cleaved by the impact energy of the flying sputter.

Furthermore, in claim 3, the reason why boron nitride is used as the agent powder for solids -1'' in the agent powder ! However, in the case of boron nitride, the surface 1 heat 11'l is particularly high, and even if it is exposed to a high temperature of 2800'C in an argon or carbon dioxide shield, it is chemically stable. d under the melting conditions of 19
'Welding nozzle, tip, jig, 7-1, etc. cannot be exposed to this type of i'':'? + Wit, but it is more stable even in special environments. Nraluru.

11: As explained above, the present invention does not require the use of a conventional binder but a solvent and a circle at a temperature of 30 to 300°C. ,] Use of fif'rtll powder to prevent spatter adhesion on welding torch nozzles, tips, jigs, etc. It increases the effect by 4q.

1 Example 1 The formulations shown in Table 1 were prepared, each of which was applied by brush to a 1-tin nozzle, and then subjected to /f\-coating under conditions of fertilization. Note that 8% 0% J) in Table 1 is an uninvented example, and the song is a composition for comparison.

Table 1 (Composition is heavy phase part) Carbon dioxide gas semi-automatic welding 1"case; Welding TifjW 400A, gas flow 1N:
``j!'6 s arc Ichikawa 40V, nozzle A, 1tlli O4 plating, inner diameter 1sakaki,...

Welding speed: 400-50 (1 tone/min.

Wire diameter 1.6φ 3 2 Downward @ 1-fillet welding result table 2 The continuous arc time is the actual welding time, and the removal of spatter deposited on the torch nozzle during that time is -9J? ”r
The limit was set at the time when the nozzle diameter became small due to spatter and proper gas flow rate (1) was not achieved, making normal welding impossible.

As shown in Table 2, Examples B, C, 'I) rr! A long continuous arc was achieved with excellent results at 41st stroke.
Comparative Examples Δ, Ie, and Fz showed severe nozzle wear.

The compositions listed in Table 3 were prepared and each was applied to a torch nozzle using a brush, and welding was performed under the following conditions.

Note that TT, ■, and J in Table 3 are non-inventive examples and are formulations for comparison with other products.

Table 3 Argon + carbon dioxide automatic welding conditions; welding current 30 (] A, scum flow -=
2ne15° arc voltage 32V, nozzle material copper
Inner diameter j8ws.

Welding speed: 500 M/min 4X-1.11 Downward fillet results Table 4 5 As shown in Table 4, similar to Example 1, Examples H1 and J of the present invention exhibited excellent effects.

Comparative Examples G, T, and T showed signs of nozzle wear due to the temperature during welding.

'rayπ1-deM' 1 person Ishihara Pharmaceutical Co., Ltd. 6

Claims (1)

[Claims] 1. Molten W11 with a boiling point of 130 to 300"C, '-solid (1
°111? Make powder powder an essential ingredient! l','
Nf' modified welding torch nozzle, tip, and sputtering such as joint cheeks made by Kiwakabo City 1゜2, a solvent with a boiling point of 130 to 300°C and a solid f1'' powder are given priority over the solvent. 1li of patent claim 1li, which is diluted and dispersed in a volatile solvent that evaporates rapidly, and during coating, the evaporation 1'1 solvent is preferentially evaporated to form coating KI''1.
jj circle 1st jl'! Dangerous city cutting with sputter listed in #l°i. 8. The sputtered foil protective agent according to claim 1 or 2, characterized in that boron nitride is blended as a solid lubricant powder.