KR200260907Y1 - Welder Chiller - Google Patents

Abstract

The present invention relates to a welding part cooling apparatus which can cool a large heat input welding part at the same time as welding and secure the physical properties of the welding part at the same level as a low input heat welding, so that the high heat input welding can be continuously performed.

The trolley 76 movable in the welding direction on the welded base support plates 20 and 20 'supporting the welded base materials 10 and 10' includes a vertical support 75, and the vertical support 74 has a rack. And a horizontal support 70 which can be moved along with it using a pinion, and the horizontal support 70 is equipped with a welder 72 which is equipped with a welder 72 which can be moved along with it using a rack and pinion. In the horizontal guide 70 is mounted so as to be movable in the longitudinal direction, and forms a cooling water passage in which the coolant flows therein, the upper surface of the upper cooling portion to be in close contact with the upper surface of the welding base material to be sliding ( 30) (30 '), and is fixed to the rod 55 of the cylinder 54 to operate in the vertical direction, the upper end is formed in a shape corresponding to the groove shape of the welded portion, the cooling water passage through which the coolant flows To the weld side It characterized by including; the inert gas in the shielding gas lower cooling section 50 so as to form a plurality of the branched hole for injecting.

Description

Welder Chiller

The present invention relates to an apparatus for cooling a welded portion in which welding by arc welding, submerged arc welding, and the like is performed, and more particularly, a high heat input welding portion is cooled at the same time as the welding to lower the heat input properties of the weld portion. The present invention relates to a welder cooling apparatus, which can be secured at the same level as welding, so that high heat input welding can be continuously performed.

In recent years, welded structures have become larger in size and the environment in which the structures are used has become more severe, and steel materials used in the construction of structures are required to be thickened and strengthened. Therefore, high heat input welding is preferable in order to improve the welding efficiency in the welding construction of high strength and thick steel. On the other hand, the steel used for the high heat input welding is strictly limited because the weld heat properties are reduced.

In order to solve these conflicting problems, a high heat input welding steel is separately developed, but a high heat input welding steel that satisfies the demands has not been put to practical use.

Therefore, in order to apply the high heat input welding method which is essential for improving the welding efficiency at this point, it is necessary to develop a welding device capable of high heat input welding on the welding device side as well as on the steel side used.

In general, high heat input welding is to increase the amount of welding heat input to increase the amount of weld metal by the welding wire. This has the advantage of improving the welding efficiency by reducing the number of welding passes (beads) during welding. However, when the high heat input welding is applied, the heat input of the welding increases, so the area where the temperature rises above 1,350 ° C increases in the weld heat affected zone of the steel, resulting in grain coarsening and finely dispersed precipitates such as TiN in the steel. There arises a problem that the weld portion is embrittled because the toughness of the weld heat affected portion is lowered. In addition, when the heat input welding is applied, the weld metal amount increases as the heat input amount increases in the weld metal, and thus the coagulation rate decreases to form a coarse columnar structure, which causes the strength, ductility, and toughness of the weld metal to decrease. .

Accordingly, an object of the present invention is to provide a welding part cooling apparatus that enables continuous high heat input welding by cooling the welding part, which has been devised to solve such a conventional problem.

1 is a front view schematically showing a welding installation with a welding unit cooling apparatus according to the present invention

2 is a cross-sectional view showing the upper cooling unit of the present invention

3a and 3b is a front view and a cross-sectional view showing a lower cooling unit of the present invention

Explanation of symbols on the main parts of the drawings

10,10 '... Welding Base Material

20,20 '... welded base plate

30,30 '... Upper Cooling Section

38,38 '... ball

40,40 '... Elastic Coil Springs

46,46 '... cooling water inlet hole

47,47 '... cooling water discharge hole

50,50 '... Lower Cooling Section

60 ... Chilled water passage

62 ... protective gas passage

As a technical configuration for achieving the above object, the present invention, the bogie movable in the welding direction on the welded substrate support plate for supporting the welded base material is provided with a vertical support, the vertical support is moved along with it using a rack and pinion The welding apparatus is equipped with a horizontal support, and the horizontal support is equipped with a welder that can move along with it using a rack and pinion, wherein the horizontal support is mounted to be movable in the longitudinal direction on the horizontal guide, A cooling water passage in which a coolant flows, and an upper cooling part in which a lower surface is in close contact with an upper surface of a welding base material and is capable of sliding; and is fixed to a rod of a cylinder configured to operate in a vertical direction, and in a groove shape of a welding part. The upper end is formed in a matching shape, and the cooling water passage is formed inside the cooling water. And a lower cooling part configured to form a plurality of branch holes for injecting a protective gas, which is an inert gas, toward the welding part. The cooling water passages of the upper and lower cooling parts are continuously supplied with the cooling water from the cooling water supply part during welding. By providing an inlet gas cooling device, characterized in that for supplying an inert gas to the branch hole of the cooling unit.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view schematically showing a welding facility equipped with a welding unit cooling apparatus according to the present invention, the welding base material support plate equipped with a rough flat plate so that the welding base material 10, 10 ', respectively, on the upper surface 20 and 20 'are installed, and the weld base material support plates 20 and 20' are supported by the support frames 22 and 22 ', respectively, so that they can be held in a firmly fixed state. Frames 22 and 22 ′ are connected to each other by connecting rods 24 so that the structure can be more firmly maintained.

An upper cooling part 30, 30 'is mounted at each upper end of each of the welding base material supporting plates 20, 20', and the lower portion of the center where the welding base material supporting plates 20, 20 'face each other. The lower cooling unit 50 is mounted.

The upper cooling parts 30 and 30 'are symmetrical to each other, hereinafter, only the upper cooling part 30 located on the left side of the drawing will be described, and the subscripts (') for the upper cooling part 30 'located on the right side. Will be given.

The upper cooling unit 30, 30 'is composed of the upper cooling body 32, 32' supported by the connecting rods 34, 34 'to the horizontal guide 70 is positioned horizontally, The connecting rods 34 and 34 ′ have a pinion (not shown) that engages the rack 72 formed in the longitudinal direction on the horizontal guide 70, and this pinion is formed by the handles 35 and 35 ′. When the handles 35 and 35 'are rotated by rotating, the connecting rods 34 and 34' and the upper cooling bodies 32 and 32 'fixed thereto can move along the horizontal guide 70 in the longitudinal direction. Make sure

The upper cooling bodies 32 and 32 ′ are made of a material having excellent thermal conductivity, as shown in more detail in FIG. 2, and the lower end portion is opened at the lower center thereof and has a predetermined length in the vertical direction. 36 '), the ball receiving holes 36 and 36' are fitted with balls 38 and 38 'so that they can move up and down simultaneously with rotation, and the balls 38 and 38' The elastic coil springs 40 and 40 'installed on the upper side of the ball receiving holes 36 and 36' through the bolt members 39 and 39 'are provided to receive the elastic repulsive force toward the lower side.

In addition, the contact plates 42 and 42 ′ are fixed to the lower surfaces of the upper cooling bodies 32 and 32 ′ through the bolt members 43 and 43 ′. 42 'is formed through the holes 44 and 44' by forming holes 44 and 44 'which are vertically penetrated smaller than the diameter of the balls 38 and 38'. Block 38 'from protruding from the ball receiving holes 36 and 36' and at the same time allow the balls 38 and 38 'to protrude slightly below the contact plates 42 and 42'. More preferably, the holes 44 and 44 'have a shape in which the inner diameter thereof gradually decreases toward the lower side so as to prevent wear due to friction with each other during rotation of the balls 38 and 38'. It is good to be able.

In addition, the upper cooling body (32, 32 ') is provided with a passage through which the coolant flows, the cooling water inlet holes 46, 46' and the cooling water discharge holes 47, 47 'is respectively 1 The cooling water passages may be formed in pieces, and a plurality of such cooling water passages may be formed as necessary to improve the cooling ability of the upper cooling bodies 32 and 32 '.

The lower cooling unit 50 is composed of a lower cooling body 52 having an upper surface formed in a shape corresponding to the shape of the lower surface of the welded part of the welding base material 10, 10 ′, and the lower cooling body 52 is By being fixed to the end of the rod 55 provided in the cylinder 54, such as pneumatic to operate in the vertical direction, it can move in the vertical direction, the cylinder 54 is fixed to the connecting table 24, such a cylinder 54 Is connected to the pneumatic storage source 58 and the pneumatic source 59 via a pneumatic supply line 56 having a valve 57 can be supplied with the pneumatic pressure required for driving, wherein the valve 57 is a solenoid It is preferable to use automatic valves, such as a valve.

In addition, the lower cooling body 52 has a coolant passage 60 through which coolant flows, as shown in more detail in FIG. 3, and on the upper surface in contact with the welding base material 10, 10 ′. In close proximity there is a protective gas passage 62 through which the protective gas can flow. Here, the protective gas passage 62 is connected to a plurality of branch holes 63 formed by drilling with a laser or the like so that the protective gas can be supplied to the lower side of the welding part through the branch holes 63.

In addition, the cooling water supply unit 90 for supplying the cooling water to the upper cooling unit 30, 30 ′ and the lower cooling unit 50 is provided. The cooling water supply unit 90 includes a tank 92 for storing the cooling water. ), And an auxiliary tank 93 for accommodating the recovered cooling water, and a pump 94 for pumping the cooling water from the tank 92 to the cooling water supply line 96, and the auxiliary tank 93. Is connected to the cooling water discharge line 97, and each of the cooling water supply line 96 and the cooling water discharge line 97 has valves 96a and 97a for opening and closing the cooling water flow.

Of course, the cooling water supply line 96 is connected to the upper cooling unit 30, 30 'and the lower cooling unit 50, respectively, to supply the cooling water, and the cooling water discharge line 97 is also the upper cooling unit 30 and 30 'are connected to the lower cooling unit 50, respectively, so that the cooling water discharged therefrom can be discharged to the auxiliary tank 93 side.

Then, the protective gas passage 62 of the lower cooling unit 50 is connected to the protective gas supply line 62a to receive argon gas (Ar), which is an inert gas, from the protective gas passage 62.

And, the horizontal guide 70 is mounted so that the welder 72 can move in the longitudinal direction, one end of the horizontal guide 70 is equipped with a pinion (not shown) to the vertical guide 74 It is connected to be able to move along the rack 75 formed on the vertical guide 74 by the handle 71.

In addition, the vertical guide 74 is fixed to the trolley 76 to move in the welding direction along the rail 21 provided in the welding base material support plate 20 '.

The operation of the present invention with the above configuration will be described.

According to the present invention, the welding metal is cooled by the upper cooling part attached to the upper left and right sides of the welding part in close contact with the welding progress direction and the lower cooling part closely contacting the lower part of the welding part in the heat input arc welding. Inert gas is injected to improve the solidification rate and cooling rate and to prevent oxidation of the superlayer weld beads.

The upper cooling parts 30 and 30 'are made of copper (Cu) to improve the cooling capacity as described above, and the cooling water is continuously circulated therein by the pump 94 to further improve the cooling performance. The upper cooling unit 30, 30 ′ is in close contact with the upper surface of each of the base materials 10, 10 ′ to cool the heat of the welding heat affected zone generated by the arc heat by cooling. The upper cooling part 30, 30 'is in contact with the upper surface of the base material 10, 10' during welding, in this case the contact plate 42, 42 'is the base material 10, 10' Ball 38, 38 'which protrudes slightly lower than the contact plates 42, 42' in this case moves upwards by pushing the elastic coil springs 40, 40 '. do. Accordingly, the upper cooling parts 30 and 30 'are along the upper surface of the base materials 10 and 10' while the balls 38 and 38 'are kept in contact with the base materials 10 and 10'. Make it easy to move.

In addition, the lower cooling unit 50 is maintained by being in close contact with the lower surface of the welded portion by being lifted by the cylinder 54, and at this time, oxidation is prevented during the first layer welding by the protective gas injected through the branch hole 63. . Of course, the lower cooling unit 50 is also made of copper in order to improve the cooling capacity, and the effective cooling action is made by the cooling water circulated by the pump 94 like the upper cooling units 30 and 30 '. . In addition, the lower cooling unit 50 is formed so that the upper end shape is in close contact with the lower portion of the weld groove, and can be exchanged by processing according to the standard weld groove shape, such as X-groove, K-groove.

In the case where the welding of the welding base material 10, 10 'is performed by the welding part cooling device of the present invention, the toughness of the first welding heat affected part is improved, which is cooled by the cooling part installed on the upper and lower parts. Increasing the speed increases the toughness of the weld heat affected zone by preventing arcs of finely dispersed precipitates in the steel, as well as reducing the area where grain coarsening occurs due to arc heating during high temperature heat welding. In detail, metallurgical description of the welding heat-affected zone is generally performed at high temperature so that the microstructures form austenite structures and the grains grow coarsely as the weld heat-affected zone cools slowly. The tissue transforms from austenite to ferrite. However, in the welding heat affected zone heated by arc heat during high heat input welding, the cooling rate is slow. Therefore, coarse grain boundary ferrite, Widmanstatten ferrite, martensite-austenite, etc. Due to the transformation into a microstructure that adversely affects the toughness will cause a problem that the toughness is reduced. However, when the heat input welding is performed while the weld is cooled, the cooling rate of the heat affected zone may be increased, thereby transforming into a needle-like ferrite, which is a microstructure favorable to the toughness of the welded heat affected zone, thereby inducing toughness improvement.

Next, the welding high temperature crack can be prevented. Generally, the high temperature crack of the weld is a crack occurring at about 1000 ° C. or more. Since the melting point compound forming element segregates at the grain boundary and has a sufficient time to form low melting point compounds such as FeS and Fe ₃ P, the risk of welding hot cracking increases. When the high heat input welding is applied, it is known that the high risk of welding high temperature cracking is high because of the long time of high temperature in the weld heat affected zone and the weld metal. However, when the weld is cooled as in the present invention, since the time to be maintained at a high temperature is very short, there is no time for a low melting point compound to be formed at the grain boundary to prevent welding high temperature cracks.

Next, the welding work efficiency is improved. In general, the welding work increases the number of welding passes as the thickness of the test material increases. When the welding work is finished, the welding bead temperature is generally set to 150 to prevent cracking of the weld. Wait until it is below ℃ and proceed to the next welding work. In particular, in the case of high heat input welding, the cooling rate of the welding bead is slower than that of general welding heat input, so the time until the temperature of the welding bead is usually cooled to 150 ° C or lower becomes longer, resulting in lower welding efficiency. There is a problem that the work concentration is reduced. However, when the welding part is cooled as in the present invention, since the welding part is continuously cooled at the same time as the welding operation, the welding worker waits to shorten the temperature between the paths, thereby improving the welding work efficiency and increasing the concentration of the welding work. It is to let.

Then, oxidation prevention of the superlayer weld bead can be achieved. The so-called superlayer weld bead, generally called a back bead, is formed of a protective gas (for arc welding) and a welding flux (for submerged welding). There is a risk of superficial weld bead oxidizing because it is not protected. However, by injecting the inert gas in the lower cooling unit as in the present invention, it is possible to prevent oxidation of the weld superlayer bead.

Next, the grain size of the weld metal and the segregation prevention are possible. Generally, it is known that when the solidification rate of the weld metal is increased to form a quench solidification form, the dendrite shape, which is a solidification structure, is refined and segregation is also suppressed. . Therefore, as the present invention increases the solidification rate of the weld metal through the upper and lower cooling parts, the dendrite structure and the columnar crystal structure are refined, and the segregation segregation is suppressed, so that the weld metal portion such as strength, ductility, and toughness of the weld metal is suppressed. The property improvement effect can be expected.

As described above, according to the welding part cooling apparatus according to the present invention, the upper and lower cooling parts are attached to an existing arc welding device or a submerged welding device, etc., so that the cooling is performed at the same time as welding as well as during general welding as well as general welding. Since the welding can be performed continuously by the high heat input, it has the excellent practical effect that can improve the welding efficiency and the quality of the welded part.

Claims (1)

The trolley 76 movable in the welding direction on the welded base support plates 20 and 20 'supporting the welded base materials 10 and 10' includes a vertical support 75, and the vertical support 74 has a rack. And a horizontal support 70 which can be moved along with it using a pinion, and the horizontal support 70 is equipped with a welder 72 which is equipped with a welder 72 which can be moved along with it using a rack and pinion. In The upper cooling unit 30 is mounted to the horizontal guide 70 so as to be movable in the longitudinal direction, and forms a cooling water passage through which the coolant flows, and the lower surface is in close contact with the upper surface of the welding base material to be slid. 30 '; It is fixed to the rod 55 of the cylinder 54 to operate in the vertical direction, the upper end portion is formed in a shape corresponding to the groove shape of the welded portion, forming a cooling water passage through which the coolant flows, and the inert gas to the welded side And a lower cooling unit (50) configured to form a plurality of branch holes for injecting gas. Welder cooling apparatus, characterized in that the cooling water passage in the upper and lower cooling unit continuously supply the cooling water from the cooling water supply unit during welding, and inert gas is supplied to the branch hole of the lower cooling unit.