KR20010086839A - Welding wire electrode with surface treatment oil, and method and apparatus for oiling the surface treatment oil - Google Patents

Abstract

PURPOSE: A wire for welding, and a method and an apparatus for anointing the same are provided on which a surface treating oil is anointed by the optimum management standard for two aspects of the anointing amount and conditions of the surface treating oil critically affecting feeding property of the wire for welding. CONSTITUTION: In anointing a surface treating oil on the surface of a wire for welding, the method for anointing the wire for welding comprises the processes of immersing the wire for welding into a surface treating oil immersing vessel (33); and forming a band-shaped form by ejecting a high pressure air onto the surface of the wire using an air ejector (34), thereby partially removing the anointed surface treating oil. In forming an anointed surface treating oil into a straight line type band-shaped form by ejecting the high pressure air onto the surface of the wire using the air ejector (34) after immersing a wire for welding into the surface treating oil immersing vessel (33), the apparatus for anointing the surface treating oil on the wire for welding comprises two or more air nozzles adhered to the inner circumferential surface of a penetrating hole as a ring structure in the air ejector (34); and one or more air supplying holes adhered to the outer surface of the air ejector in addition to the inner circumferential surface of the penetrating hole.

Description

Welding wire electrode with surface treatment oil, and method and apparatus for oiling the surface treatment oil}

The present invention relates to a welding wire and an oiling method and apparatus for forming a surface-treated oil coating layer in which the oiled area and the apparent area ratio are appropriately adjusted by the reference apparent area ratio range in lubricating the surface-treated oil on the surface of the welding wire. More specifically, after defining the apparent area ratio that can be derived from uniformly forming the insulated and non-oiled surfaces on the wire surface-the ratio of the oiled area to the total surface area of the wire to be measured-the optimum range for that area ratio. Calculate the oil content of the surface treatment oil and apply the surface treatment oil by immersion on the surface of the welding wire such as gas shield arc welding solid wire, flux cored wire, stainless mig wire, etc. Or rotating welding wire with surface treatment oil applied to the entire surface The present invention relates to a welding wire and a method and apparatus for forming a surface-treated oil coating layer having a straight or spiral band shape by appropriately removing a part of the surface coating layer by passing through a ring-shaped air injector through hole.

Recently, with the development of each industry such as shipbuilding, bridge, steel frame, automobile, the usage of welding wire is increasing rapidly. This is because the conventional manual welding is semi-automatic or automatic by robot to improve the productivity of welding work. It is a natural trend to change to welding.

Therefore, the length of the welding wire is also longer, and the longer wire inevitably has more bends, which may cause a problem in the supply of the wire during welding. As the length of the wire increases, the welding productivity increases. Wire supply is an important variable.

In gas shielded arc welding, the feedability of the welding wire is closely related to the safety of the arc and the formation state of the weld bead, especially when the welding wire length between the feeding roller and the welding torch is long and there are many bends. As the welding current is used higher, the wire feeding speed also increases, resulting in poor bead shape due to feeding irregularity and arc instability.

In general, factors affecting the supplyability of the welding wire include the quality of the wire surface plating layer, the surface state and the coated state of the surface treatment oil, and the tensile strength and straightness of the wire.

In order to improve the supplyability of the welding wire, many improvements have been made to the plating amount and the plating method of the wire surface plating layer, and in the aspect of improving the tensile strength, a heat treatment process was introduced in the middle of the wire, and the roughness or specific surface area of the wire surface was introduced. Much progress has been made to improve the feedability, with improved surface conditions through management and the development of new surface treatment oils.

In particular, Japanese Unexamined Patent Publication No. Hei 1-6689999 has a lubricant prepared by mixing a higher fatty acid, which is a mineral oil, and a higher fatty acid metal salt, onto the wire surface after final drawing. It is disclosed that oil supply can be improved by lubricating oil containing sodium salt or potassium salt on the surface of the wire, but only the type and oil amount of the surface treatment oil are mentioned, and no important oiling method is mentioned.

The oiling amount and oiling state of the surface-treated oil are important as follows.

If the amount of surface-treated oil oiled on the surface of the welding wire is small or the oiled state is uneven, the frictional force in the cable increases when the wire is supplied, the wire feeding is not stable, and the arc becomes unstable, which makes normal welding impossible. If the oil content is excessive, slip may occur in the feeding roller or excessively coated surface treatment oil at the tip of the welding torch may fall off and evaporate into the molten paper where molten metal is formed. As the holes are formed, it is very important to manage the amount of oil to be treated and the type of oil to be treated.

Conventional lubrication methods for wire surface treatment oils include wet skin pass, felt petroleum, and electrostatic lubrication.

The wet skin pass method is a surface treatment oil lubrication method used for the final drawing of the welding wire, and forms a constant lubrication pool on the surface of the plating layer and embeds a lubricant in the lubrication pool. Not only is not applicable, but there is a problem that the production cost of the wire increases.

The felt oiling method is a method of controlling the oiling amount of the surface treated oil by appropriately applying the surface treated oil to the surface of the wire after the final drawing and then wiping with a front felt.

However, the felt oiling method is a method using a capillary phenomenon, the variation in oiling amount according to the initial use time and the use time of the felt is not only large, but also the wiping function of the front felt is also removed from the plating layer on the wire surface as the use time becomes longer. The contamination of the felt is increased by the metal powder, which does not maintain the initial state, but rather causes the adverse effect of adhering foreign substances on the wire surface.

As another method, the electrostatic lubrication method, in which the oiling facility itself is expensive, has the advantage of uniformly lubricating the entire surface of the welding wire by misting the surface treated oil, but managing the apparent area ratio of the surface treated oil to a desired value. Difficult to do

That is, in the conventional conventional oiling method, it is difficult to effectively manage the uniform oiling amount and oiling form, and thus it is difficult to improve the supplyability in terms of surface treatment oil.

As described above, the optimum management criteria for the two aspects of the oiling amount of the surface treatment oil and the oiling state which have a significant influence on the supplyability of the welding wire, and the welding wire and the oil for which the surface treatment oil is infiltrated by the criteria It is an object of the present invention to provide a method and apparatus.

1 is a perspective view of an air injector for forming a spiral oil coating layer according to the present invention.

2A and 2B are front and side cross-sectional views of the air jetting body shown in FIG. 1, respectively.

3 is a schematic structural diagram of a surface treatment oil petroleum installation according to the present invention.

4 is a view showing the position and angle of the air nozzle attached to the inner peripheral surface of the air injector for forming the spiral oil coating layer according to the present invention,

(A) is a front view,

(B) is a side cross-sectional view.

Figure 5 is a front view of the welding wire in which the surface treatment oil in the form of a spiral band in accordance with the present invention method.

6 is a view showing a state in which the welding wire in which the surface treatment oil in the form of a spiral strip is cut to a predetermined length such that the center angle of the cross section is 45 °,

(A) is a perspective view of a cut piece,

(B) is a state where the outer peripheral surface of the cut piece is extended.

7 shows an air injector for forming a straight oil layer according to the present invention,

(A) is a perspective view,

(B) is a side cross-sectional view.

8 is a correlation diagram between kinematic viscosity and temperature of the surface-treated oil.

((Explanation of symbols for main part of drawing))

21. Inner Ring 22. Outer Ring

23. Bearing 24. External gear

25. Air nozzle 33. Surface treatment oil deposition tank

34. Air jet

The above object of the present invention is to provide a surface area oil, which is an oil ratio of surface treated oil, a deposition tank filled with surface treated oil for injecting the surface treated oil to the entire surface of the welding wire so that the apparent area ratio can be utilized, and the surface treated oil oiled to the entire wire surface. This is achieved by a ring-shaped air injector which uniformly removes a portion to form a straight or helical band-like oil layer.

The apparent area ratio refers to the ratio of the oil area to the total surface area of the wire when the surface treated oil is formed on the wire surface in the form of a straight or spiral strip to separate the wire surface into the oiled and non-oiled surfaces. The uniform shape of the surface-treated oil to be lubricated is important, and therefore, it is most effective to form the coating layer of the surface-treated oil in a straight or spiral band shape.

Before referring to the apparent area ratio, an apparatus and method for forming a surface-treated oil coating layer in the form of a straight or spiral band, which is essential for this, will be described.

The oiling apparatus of the present invention is composed of a deposition tank and an air injector. When the air injector forms a straight oil layer, the air injector has a simple shape such as a ring with at least two air nozzles attached to the inner circumferential surface of the through hole, but forms a spiral oil layer. In the case of a rather complex double ring, the outer ring receives high pressure air and delivers the high pressure air to the inner ring to which at least one air nozzle is attached and rotates and is fixed. .

The surface treatment oil lubrication method of the present invention using the air injector and the deposition tank is as follows.

After the final drawing of the welding wire, the wire is passed through the immersion tank before it is wound, and the surface of the oil is applied to the surface of the wire, and then proceeded through the through hole of the air injector, and then through the air nozzle attached to the inner circumferential surface of the ring through hole. A portion of the surface treatment oil oiled throughout the wire surface is uniformly removed by the injected high pressure air.

At this time, the oil content and the strip shape of the surface treated oil formed in the form of a strip while remaining on the wire surface can be controlled by changing the air pressure to be injected, the temperature of the surface treated oil, and the like. The rotation speed of the inner ring is also an important control factor.

In the oiling method of the present invention, the surface-treated oil is formed in the form of a band because there is a limit in obtaining a minimum oil amount when the entire surface of the wire is oiled.

Details of the above technical configuration and specific effects of the surface treatment oil coating method of the welding wire of the present invention will be clearly understood by the following description with reference to the drawings showing preferred embodiments of the present invention.

1 and 2 show a perspective view, a front view and a side cross-sectional view of a spiral oil coating layer forming air injector, and FIG. 3 shows a schematic equipment layout after final drawing, and FIG. 7 shows a straight oil coating layer forming air injector. A perspective view and a side cross-sectional view are shown.

The air injector 70 forming the oil strip layer 71 in the form of a straight strip is simpler in structure than the air injector 34 used in forming the spiral oil layer. In other words, the former 70 is divided into an inner ring 21 and an outer ring 22, and the inner ring and the outer ring are integrated into one fixed ring in the double ring structure of the latter 34 in which the inner ring rotates. In the following description, the latter and the spiral coating layer will be described.

As shown, the welding wire 31 passes through the final drawing machine 32 and after the surface treating oil 33A is oiled on the surface in the deposition tank 33, the welding wire 31 passes through the air injector 34. The manufacturing is completed by winding up to (35).

In the above process, the air injector 34 which forms the surface-treated oil oiled on the entire wire surface in the form of a spiral band has a double ring structure, and the outer circumferential portion 21A of the inner ring 21 has at least one air. The inner circumferential portion 22A of the outer ring 22 is connected to the through-hole inner circumferential portion 22A of the outer ring 22 to which the supply port 22B is attached, and the bearing 23 bearing the side surface thereof. As a structure that can rotate along, the gear 21C attached to one side portion 21B of the inner ring 21 and another outer gear 24 are coupled in the form of a spiral bevel gear, and by a motor The inner ring 21 is rotated by the driven external gear 24.

Four air nozzles 25 are attached to the inner circumferential surface 21D of the through hole of the inner ring 21, and the air injection angle of each air nozzle 25 is formed on the outer circumferential surface of the wire 31 as shown in FIG. Angle 41 is the air injection direction is the tangential direction of the outer circumferential surface, the air injection direction with respect to the traveling direction 44 of the wire 31 is attached so that the reverse angle 42 is 45 °, it is configured to be adjustable do.

As described above, the air nozzle attached to the inner circumferential surface of the through hole of the inner ring 34 for forming the spiral oil coating layer has uniformity because the oiling portion and the non-oiling portion formed on the wire surface rotate in the wire length direction. One or more may be required, but in the case of a single spray nozzle 70 for forming a straight oil layer, at least two nozzles should be attached since the non-oiling surface is ubiquitous on only one side of the wire surface.

And, to give an angle to the air nozzle, only the surface treatment oil on the surface of the wire which is first contacted with the injection air is removed, and the final surface treatment oil on the surface of the wire outside the air jetting body is minimized by minimizing the influence on other surface treatment oils as much as possible. This is to avoid affecting the form.

Therefore, the wire in which a large amount of the surface treatment oil is infiltrated by the deposition is passed through the air injector, and only the surface treatment oil 51 in the form of a spiral band remains, which is schematically illustrated in FIG. 5.

Fig. 6 (a) is cut out by the arbitrary length so that the cross-sectional center angle of the wire in which the said spiral strip | belt-shaped surface treatment oil was infiltrated was 45 degrees, and (b) spreads only the surface on a plane.

In this case, the ratio of the surface treatment oil induction area to the total surface area is the aforementioned apparent area ratio, and the apparent area ratio can be expressed by the following equation.

Provided that S = (a + b) x (a '+ b'); Apparent total area of the object to be measured

The apparent area ratio of the surface-treated oil oiled in the form of a straight band by the method of the present invention is controlled by adjusting the viscosity of the oil by controlling the temperature of the air pressure sprayed from the air injector and the surface-treated oil. The rotational speed of the ring adds additional control, so that it can be managed in the range of 20 to 85, so that the oil content of the surface treatment oil can be in the range of 0.015 to 0.15 g per kilogram of wire.

The apparent area ratio is different depending on the type of welding wire and the welding method, but if it is less than 20, the amount of surface treatment oil is too small and the supplyability is not stable. There is a risk of generating a defect.

To compare the feeding properties and weldability of the welding wire by the method of injecting the surface treatment oil in the form of a spiral strip among the oiling forms according to the present invention and the conventional felt oiling method.

The welding work conditions performed are shown in Table 1 below.

Welding condition Shield Gas Supply (CO ₂ ) Welding torch Current Voltage speed Length Loop diameter turn 320A 32 V 35 CPM 20 l / min. 6m 200 mm 1 to 2

* Welding position; Downward

The welding wire used for the welding work performed under the above welding conditions was made by using the final wire of 1.2 mm wire diameter of JIS Z3312 YGW 11 standard, and the type of surface treatment oil was used at a general operating temperature among the three types shown in FIG. 8. An appropriate type A was selected, and a comprehensive evaluation of the feedability test was carried out by varying the apparent area ratio and oil flow rate, according to the wire slip ratio (), arc stability, and feedability of the feeding roller, and weld defects were also evaluated. In addition, the supplyability was evaluated by the possibility of supply when a welding torch having a length of 6 m was set to a loop diameter of 200 mm.

division No. State of Road Song Rapid Test Weld defect Area ratio () Oil coating amount (g / Kg) Spiral Slip rate () Feeding Very high stability Comprehensive Evaluation 1 turn 2 turn Invention One 25 0.018 0 1.2 0 0 0 ◎ radish 2 40 0.035 0 1.5 0 0 0 ◎ radish 3 50 0.037 0 2.1 0 0 0 ◎ radish 4 84 0.130 0 4.0 0 △ △ 0 radish 5 20 0.016 0 0.8 0 △ △ 0 radish Comparative material 6 15 0.020 × 2.0 △ × × × radish 7 20 0.012 × 1.5 0 × △ △ radish 8 87 0.210 × 6.0 △ × △ △ U 9 90 0.195 × 12.0 × × × × U

In Table 2, the arc stability is the result of investigating the number of arc short circuits, current change, and voltage change with a monitoring system. The weld defect was evaluated by the appearance of a bead of 1 m length, and the slip ratio was calculated by the following equation.

In Table 2, the apparent area ratios of Nos. 1 to 3 of the present invention are in the range of 20 to 85, the oiling amount is also in the range of 0.015 to 0.15 g per 1 kg of wire, and the oiling forms are also spiraled, which shows that the excellent feedability test results. However, in the case of Inventive Materials 4 and 5, the arc stability is somewhat lower than that of the other embodiments of the present invention by approaching the upper and lower limits of the area ratio management range of the present invention, and it is found that the second rotation is not stable even in supplyability. have.

The comparative material is a coating of surface treated oil by a conventional felt oiling method, and when compared with the present invention, it can be seen that more surface treated oil is oiled in the case of a felt type when having a similar apparent area ratio. Compared to the method, the wire feeding ability was lowered, resulting in the stability of the arc.

In particular, in case of Comparative Materials 8 and 9, due to excessive surface treatment oil, the slip on the feed roll increases rapidly, and the feedability decreases, and the surface treated oil accumulated at the tip end during welding falls to the weld part and causes welding defects. It can be seen.

As described above, the method and apparatus for forming the surface treatment oil coating layer having the apparent area ratio and the band shape of the present invention can not only control the amount of oil oil per unit weight of wire to a small amount, but also maintain a constant chart form. As a result, it is effective in improving the uniform supplyability of wires and preventing weld defects caused by excessive surface treatment oils, and forming an oiled form of surface treatment oils by indirect contact with air, which also has the advantage of preventing contamination of the wire surface. .

Claims (5)

In the welding wire in which the surface treatment oil is oiled, the insulated surface is cut when the welding wire is cut into a cross section with respect to the longitudinal direction and a circumferential area corresponding to a center angle of 45 ° in the circumferential direction 360 ° on the cross section is developed on a plane. A welding wire coated with surface-treated oil, wherein the apparent area ratio of the treated oil is 20 to 85 by the following formula. Provided that S = (a + b) x (a '+ b'); Apparent total area of the object to be measured 2. The surface treatment according to claim 1, wherein the surface treatment oil lubricated on the surface of the welding wire is one of a straight band and a spiral band, and the amount of surface treatment oil is 0.015 to 0.15 g per Kg of welding wire. Oil-welded welding wire. In lubricating the surface treatment oil on the surface of the welding wire, the welding wire is immersed in the surface treatment oil deposition tank, and then the high pressure air is sprayed on the surface of the wire using an air injector to partially remove the surface treated oil. Surface treatment oil coating method of the welding wire, characterized in that formed in the form of a strip. After depositing the welding wire in the surface treatment oil deposition tank, the high pressure air is sprayed on the surface of the wire by using an air injector to form the surface treated oil in the form of a straight strip. At least two air nozzles are attached to the inner circumferential surface of the through hole as a structure, and at least one air supply port is attached to the outer surface of the injector outside the inner circumferential surface of the through hole. After depositing the welding wire in the surface treatment oil deposition tank, the high pressure air is sprayed on the surface of the wire by using an air injector to form the oil-treated surface treatment oil in the form of a spiral band. At least one air supply port is attached to the outer ring and the inner circumference is composed of an inner ring with at least one air nozzle is attached, the outer circumference of the inner ring is sealed through the inner circumference of the through hole of the outer ring Rotating the inner ring by an outer gear driven by a motor coupled to the bearing and configured to rotate along the inner circumference of the outer ring, the gear attached to one side of the inner ring and another outer gear in the form of a helical bevel gear. Surface treatment oil oiling apparatus of the welding wire, characterized in that configured to be made.