CN212977076U - Argon arc self-melting welding gun for small-diameter deep hole - Google Patents
Argon arc self-melting welding gun for small-diameter deep hole Download PDFInfo
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- CN212977076U CN212977076U CN202021755816.2U CN202021755816U CN212977076U CN 212977076 U CN212977076 U CN 212977076U CN 202021755816 U CN202021755816 U CN 202021755816U CN 212977076 U CN212977076 U CN 212977076U
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Abstract
The utility model provides an argon arc is from melting welder for small-bore deep hole belongs to the welding technology field, can solve current argon arc welder and can not carry out welded problem in the small-bore deep hole. The argon arc self-melting welding gun comprises a conductive nozzle and a gun body; the gun body is arranged at the rear end of the contact tube, and a first gas channel is arranged on the gun body; the contact tube comprises a sleeve and a base body; the front end of the base body is provided with a first tungsten electrode mounting hole for mounting a tungsten electrode; the sleeve is provided with an air nozzle at a position corresponding to the first tungsten electrode mounting hole; a first annular boss and a second annular boss are arranged at two ends of the base body; two ends of the sleeve are respectively connected with the first annular boss and the second annular boss, so that an air storage chamber is formed between the sleeve and the base body; the base body is provided with a second gas channel, the rear end of the second gas channel is communicated with the first gas channel, and the front end of the second gas channel is communicated with the gas storage cavity. The utility model discloses an argon arc is from melting welder small, can weld in small-bore deep hole.
Description
Technical Field
The utility model relates to the field of welding technique, especially, relate to an argon arc is from melting welder for small-bore deep hole.
Background
Some small-bore valves, such as high-pressure stop valves, check valves, etc., have valve body sealing surfaces in deep hole positions, and have large difficulties in surfacing, machining and detection, and high rework rate. In order to make the surfacing, machining and inspection of the sealing surface easier, provision is made for a valve seat to be provided, so that the sealing surface of the valve body is displaced onto the valve seat. The specific manufacturing process comprises the following steps: after the valve seat is machined to the size of a finished product, the valve seat is embedded into the valve body, and therefore the sealing surface of the valve body is converted into the sealing surface of the valve seat.
In practical application, in order to prevent the valve body from leaking, the valve seat and the matched flow passage hole part of the valve body need to be welded into a whole. However, since the diameter of the flow channel hole is small (for example, the diameter is less than 25 mm) and the position is deep (for example, the depth is more than 50 mm), it is difficult to perform welding.
In the existing argon arc welding gun, the minimum nozzle is a ceramic nozzle matched with QS200A, and the length of the minimum nozzle is 17 mm. Even if the inner hole is welded by adopting the nozzle, the total size of the diameter of the head part of the welding gun is larger than 30mm by adding the sizes of the gun body and the tungsten electrode cap, and the welding can not be carried out in a small-diameter deep hole with the diameter less than 30 mm.
Disclosure of Invention
An object of the utility model is to provide an argon arc is from melting welder for small-bore deep hole can solve current argon arc welder and can not carry out the welded problem in the small-bore deep hole.
Realize the utility model discloses the technical scheme of purpose as follows:
the embodiment of the utility model provides an argon arc self-fluxing welding gun for a small-caliber deep hole, which comprises a conductive nozzle and a gun body; the gun body is arranged at the rear end of the contact tube, and a first gas channel is arranged on the gun body; the contact tube comprises a sleeve and a base body; the front end of the base body is provided with a first tungsten electrode mounting hole for mounting a tungsten electrode; the sleeve is provided with a gas injection port at a position corresponding to the first tungsten electrode mounting hole; a first annular boss and a second annular boss are arranged at two ends of the base body; two ends of the sleeve are respectively connected with the first annular boss and the second annular boss, so that an air storage cavity is formed between the sleeve and the base body; and a second gas channel is arranged on the base body, the rear end of the second gas channel is communicated with the first gas channel, and the front end of the second gas channel is communicated with the gas storage cavity.
Optionally, the gun body is detachably connected with the rear end of the contact tube.
Optionally, an external thread is arranged on the outer wall of the rear end of the contact tube; the rifle body is provided with the mounting hole, the inner wall of mounting hole is provided with the internal thread, the external screw thread with the internal thread cooperation is connected.
Optionally, the second annular boss comprises a first boss and a second boss which are integrally arranged; the first boss faces one side of the first annular boss; the diameter size of the first boss is smaller than that of the second boss; the second end of the sleeve is sleeved on the first boss, and the end face of the second end is abutted against the end face of the second boss.
Optionally, the first end of the sleeve is sleeved on the first annular boss.
Optionally, the outer diameter of the sleeve is equal to the diameter of the second boss.
Optionally, the second gas channel comprises a transverse gas channel and a longitudinal gas channel which are communicated; the extension direction of the transverse gas channel is parallel to the axis of the substrate; the longitudinal gas channels extend in a direction perpendicular to the axis of the transverse gas channels.
Optionally, the axis of the first tungsten electrode mounting hole is perpendicular to the axis of the base.
Optionally, a second tungsten electrode mounting hole coaxial with the first tungsten electrode mounting hole is formed in the sleeve.
Optionally, a jackscrew hole is formed in the front end face of the base body, and a fastening piece is installed in the jackscrew hole; the front end of the fastener is used for tightly propping against the side wall of the tungsten electrode.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides an argon arc for small-bore deep hole melts welder from melting sets up the rifle body through the rear end at the current-conducting nozzle, and front end installation tungsten utmost point. Form the gas storage cavity between the sleeve of conductive nozzle and the base member, the front end and the gas storage cavity intercommunication of the second gas passage on the base member, the first gas passage intercommunication on rear end and the rifle body, after protective gas is imported through first gas passage and second gas passage, protective gas stores in the gas storage cavity, the jet orifice that sets up on the sleeve is with the protective gas blowout in the gas storage cavity to realize that argon arc from melting welder weld zone can be protected by protective gas when the welding. The existing argon arc welding gun can achieve the amount of protective gas required by welding, and a gas channel with a larger diameter size needs to be arranged, so that the welding gun has a larger size and cannot be used for small-caliber deep hole welding. Compared with the prior art, this application is owing to form the gas storage cavity between sleeve and the base member, and protective gas stores behind the gas storage cavity, and rethread air jet blowout protective gas can reach the required protective gas's of welding quantity of gas, can make the size of conductive nozzle and rifle body all reduce moreover, and then makes argon arc from melting welder's size reduce, can stretch into in the valve body to realize the welding of small-bore deep hole.
Drawings
Fig. 1 is a schematic structural diagram of an argon arc self-fluxing welding gun for a small-diameter deep hole according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a substrate according to an embodiment of the present invention;
fig. 3 is a schematic view of a sleeve structure according to an embodiment of the present invention;
fig. 4 is a partial schematic view of a gun body according to an embodiment of the present invention;
FIG. 5 is a first schematic view illustrating the combination of the argon arc self-fluxing welding gun and the valve body according to the embodiment of the present invention;
FIG. 6 is a first schematic view illustrating a combination of an argon arc self-fluxing welding gun and a simulation piece according to an embodiment of the present invention;
FIG. 7 is a second schematic view of the argon arc self-fluxing welding gun and the valve body according to the embodiment of the present invention;
fig. 8 is a second schematic view illustrating a combination of an argon arc self-fluxing welding gun and a simulation member according to an embodiment of the present invention.
Icon: 1-gun body; 11-a first gas channel; 12-mounting holes; 13-internal screw thread; 2-a contact tip; 21-a substrate; 211-first tungsten electrode mounting hole; 212-a first annular boss; 213-a second annular boss; 2131-a first boss; 2132-a second boss; 214-a second gas channel; 2141-transverse gas channels; 2142-longitudinal gas channels; 215-jackscrew hole; 216-external threads; 22-a sleeve; 221-a second tungsten electrode mounting hole; 222-an air jet; 3-a gas storage chamber; 4-tungsten electrode; 5-a fastener; 6-valve body; 7-valve seat; 8-simulation.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an argon arc self-fluxing welding gun for a small-diameter deep hole according to the present invention. The embodiment of the utility model provides an argon arc self-fluxing welding gun for small-bore deep hole, including contact tip 2 and rifle body 1; the gun body 1 is arranged at the rear end of the contact tube 2, and a first gas channel 11 is arranged on the gun body 1; the contact tip 2 comprises a sleeve 22 and a base 21; the front end of the base body 21 is provided with a first tungsten electrode mounting hole 211 for mounting the tungsten electrode 4; the sleeve 22 is provided with an air injection port 222 at a position corresponding to the first tungsten electrode mounting hole 211; a first annular boss 212 and a second annular boss 213 are arranged at two ends of the base body 21; the two ends of the sleeve 22 are respectively connected with the first annular boss 212 and the second annular boss 213, so that the air storage chamber 3 is formed between the sleeve 22 and the base body 21; the base body 21 is provided with a second gas passage 214, the rear end of the second gas passage 214 is communicated with the first gas passage 11, and the front end is communicated with the gas storage chamber 3.
The contact tube 2 is generally made of any metal material with good conductivity and welding performance. The carbon steel material which is conductive, weldable and low in price is preferably used, so that the manufacturing cost of the welding gun can be reduced. The gun body 1 is not replaced generally, and the outer diameter size can be designed to be larger for durability, and the gun body is made of stainless steel, red copper, brass or chromium zirconium copper materials which have good electrical conductivity and are difficult to rust. Besides the first gas channel 11, the gun body 1 can be provided with a circulating water channel to cool the gun body 1, so that the service life of the gun body 1 is prolonged.
Optionally, the gun body 1 is detachably connected with the rear end of the contact tip 2. Specifically, as shown in fig. 1 and 2, the outer wall of the rear end of the contact tip 2 is provided with an external thread 216; as shown in fig. 4, the gun body 1 is provided with a mounting hole 12, the inner wall of the mounting hole 12 is provided with an internal thread 13, and the external thread 216 is in fit connection with the internal thread 13. The argon arc self-melting welding gun of the embodiment omits a water cooling system of the current contact nozzle part of the existing welding gun, so that the appearance of the current contact nozzle 2 is reduced, and the argon arc self-melting welding gun is favorable for small-caliber deep hole welding. But owing to do not have water cooling system, so contact tube 2 can only be in the air natural cooling, and easy damage needs often to be changed, and the rifle body 1 can be dismantled with contact tube 2 rear end and be connected, makes things convenient for contact tube 2's change, and threaded connection makes things convenient for processing easily, easy to assemble and dismantlement, adopts threaded connection moreover, connects more firmly. Of course, can dismantle the connection and still can be for setting up the screw on the rear end of contact tube 2 and the rifle body 1, the rethread bolt fastening realizes, the embodiment of the utility model provides a structure to dismantling the connection does not do the injecing.
In practical application, as shown in fig. 2, the axis of the first tungsten electrode mounting hole 211 is perpendicular to the axis of the base 21, so that when welding is performed on the inner wall of a welding part in a small-caliber deep hole, when a welding gun or the welding part is rotated, welding can be conveniently performed on the inner wall of the welding part, such as the welding of the flow passage hole part where the valve body and the valve seat are matched. Of course, according to the use requirement, the axis of the first tungsten electrode mounting hole 211 may be parallel to the axis of the base 21 or may be a predetermined angle, which is not limited in the embodiment of the present invention.
When welding, argon protective gas is introduced around the arc welding to isolate air outside the welding area, so as to prevent oxidation of the welding area, and the tungsten electrode 4 and the welding pool are protected, the first gas channel 11 and the second gas channel 214 are used for inputting protective gas, the gas storage chamber 3 is used for storing argon protective gas, and the gas jet port 222 is used for ejecting protective gas. According to the structure of the contact tube 2, the gas storage cavity 3 is an annular groove, the outer diameter of the annular groove is 8mm, and the inner diameter of the annular groove is 6 mm. The gas nozzle 222 is coaxial with the first tungsten electrode mounting hole 211, and the inner diameter of the gas nozzle 222 is larger than that of the tungsten electrode 4, generally the inner diameter of the gas nozzle 222 is 8mm, and the inner diameter of the first tungsten electrode mounting hole 211 is 2.4 mm.
Fig. 1 and 2 illustrate a case where the first annular projection 212 is located at the front end of the base body 21 and the second annular projection 213 is located at the rear end of the base body 21; in practice, the first annular projection 212 may be located at the rear end of the base 21, and the second annular projection 213 may be located at the front end of the base 21.
With continued reference to fig. 1 and 2, the second annular boss 213 includes a first boss 2131 and a second boss 2132 integrally provided; the first boss 2131 faces one side of the first annular boss 212; the diameter size of the first boss 2131 is smaller than the diameter size of the second boss 2132; the second end of the sleeve 22 is sleeved on the first boss 2131, the inner diameter of the sleeve 22 is equal to the outer diameter of the first boss 2131, and the fit clearance is 0.2mm to 0.3mm, so that the inner wall of the second end is attached to the outer wall of the first boss 2131, and the end face of the second end abuts against the end face of the second boss 2132, so that the sleeve 22 is not easy to slide in the axial direction of the base body 21, and the structure of the contact tip 2 is firmer. Meanwhile, the diameter of the first boss 2131 is smaller than that of the second boss 2132, and the second end of the sleeve 22 is sleeved on the first boss 2131, so that the radial size of the contact tube 2 can be reduced, the body shape of the contact tube 2 can be further reduced, and the welding of a small-diameter deep hole is further facilitated.
In practical applications, the first end of the sleeve 22 is sleeved on the first annular boss 212, so as to facilitate the installation of the sleeve 22 on the base 21. Generally, the inner diameter of the sleeve 22 is equal to the outer diameter of the first annular boss 212, and the fit clearance is 0.2mm to 0.3mm, so that the inner wall of the first end of the sleeve 22 is attached to the outer wall of the first annular boss 212. Specifically, when the sleeve 22 is installed, the second end of the sleeve 22 is sleeved from the end of the base 21 where the first annular boss 212 is disposed, and after moving axially along the base 21, the second end of the sleeve 22 is sleeved on the first boss 2131 of the second annular boss 213, and the end surface of the second end abuts against the end surface of the second boss 2132. And then, performing non-filler wire argon arc welding at the gap between the first end of the sleeve 22 and the base body 21, and performing non-filler wire argon arc welding at the gap between the second end of the sleeve 22 and the second boss 2132. The argon arc welding without wire filling not only can realize the welding of the base body 21 and the sleeve 22, but also has lower manufacturing cost and simple welding mode and is easy to implement.
In practice, the outer diameter of the sleeve 22 is equal to the diameter of the second boss 2132. Therefore, when the sleeve 22 is sleeved on the base body 21, the radial size of the contact tip 2 is the smallest, the overall size of the contact tip 2 is further reduced, and the processing of a small-caliber deep hole is facilitated. In practical application, the contact tip 2 has an outer diameter of 11 mm.
Of course, the first and second annular lands may each include only one land. The sleeve 22 may be sleeved over the first and second annular bosses. It is also possible that both end faces of the sleeve 22 are connected to the inwardly facing end faces of the first and second annular bosses, respectively, so that the sleeve 22 is disposed between the first and second annular bosses. The embodiment of the present invention does not limit the connecting position between the two ends of the sleeve 22 and the first annular boss 212 and the second annular boss 213.
In practical applications, as shown in fig. 1 and 2, the second gas channel 214 includes a transverse gas channel 2141 and a longitudinal gas channel 2142 which are communicated with each other; the extending direction of the lateral gas channel 2141 is parallel to the axis of the base 21; the longitudinal gas channels 2142 extend in a direction perpendicular to the axis of the transverse gas channels 2141, and the second gas channels 214 are generally arranged as L-shaped channels, thereby facilitating the fabrication of the second gas channels 214. In actual manufacture, the second gas passage 214 has an inner diameter of 3 mm.
As shown in fig. 3, the sleeve 22 is provided with a second tungsten electrode mounting hole 221 coaxial with the first tungsten electrode mounting hole 211. The second tungsten electrode mounting hole 221 is formed, so that the tungsten electrode 4 can penetrate through the contact tube 2 in the radial direction of the contact tube 2 when being mounted, the mounted tungsten electrode 4 can be more stable, the shaking in use is reduced, the size of the mounted tungsten electrode 4 can be longer, and the frequency of the mounted tungsten electrode 4 is reduced. The inner diameter of the second tungsten electrode mounting hole 221 is generally set to be 2.4mm, which is the same as the inner diameter of the first tungsten electrode mounting hole 211.
Optionally, as shown in fig. 1 and 2, the front end surface of the base body 21 is provided with a top thread hole 215, and the fastener 5 is installed in the top thread hole 215; the front end of the fastener 5 is used for tightly pushing against the side wall of the tungsten electrode 4, so that the tungsten electrode 4 is more stably installed and is not easy to fall off, and the shaking of the tungsten electrode 4 during use is further reduced. Typically the jackscrew hole 215 is threaded M3. The fastening member 5 is a fastening screw, and in order to prevent the fastening screw from being oxidized and rusted at high temperature and difficult to disassemble, the fastening screw made of 304 or 316 materials is generally selected.
The utility model provides an argon arc for small-bore deep hole melts welder from melting sets up rifle body 1, front end installation tungsten utmost point 4 through the rear end at contact tube 2. Form gas storage chamber 3 between the sleeve 22 of contact tip 2 and the base member 21, the front end and the gas storage chamber 3 intercommunication of the second gas passage 214 on the base member 21, the rear end communicates with the first gas passage 11 on the rifle body 1, after protective gas is imported through first gas passage 11 and second gas passage 214, protective gas stores in gas storage chamber 3, the gas jet 222 that sets up on the sleeve 22 is with the protective gas blowout in the gas storage chamber 3, thereby realize that argon arc self-fluxing welder weld zone can be protected by protective gas when the welding. The existing argon arc welding gun can achieve the amount of protective gas required by welding, and a gas channel with a larger diameter size needs to be arranged, so that the welding gun has a larger size and cannot be used for small-caliber deep hole welding. Compared with the prior art, this application is owing to form gas storage chamber 3 between sleeve 22 and the base member 21, and protective gas stores behind gas storage chamber 3, and rethread gas jet 222 blowout protective gas can reach the required protective gas's of welding gas quantity, can make contact tip 2 and rifle body 1's size all reduce moreover, and then makes argon arc from melting welder's size reduce, can stretch into in the valve body to realize the welding of small-bore deep hole.
The embodiment of the utility model provides an argon arc for small-bore deep hole melts welder from melting can realize more than phi 15mm, and the valve body and the valve seat circumferential weld argon arc of the small-bore deep hole below phi 30mm melt the welding from melting.
As shown in fig. 5 and 7, when the valve body 6 and the valve seat 7 are welded, the tungsten electrode 4 on the contact tip 2 must reach the flow passage hole portion where the valve body 6 and the valve seat 7 are fitted, and the depth H, i.e., the distance from the end of the valve body 6 to the bottom of the valve seat 7, is larger as H is deeper, the longer the length of the contact tip 2 is. The outside diameter phi C of the contact tip 2 must be smaller than the inside diameter phi A of the passage hole, and the outside diameter phi D of the gun body 1 must be smaller than the inside diameter phi B of the valve body 6.
As shown in fig. 5 and 6, the embodiment of the present invention provides a process for preparing and using an argon arc self-melting welding gun for a small-diameter deep hole:
s1, completing the machining of the sleeve 22 (without drilling the second tungsten electrode mounting hole 221).
S2, finishing the processing of the substrate 21 (not drilling the first tungsten electrode mounting hole 211 and not processing the M3 jackscrew hole 215).
And S3, assembling the sleeve 22 and the base body 21.
S4, completing the welding of the sleeve 22 and the base body 21.
S5, drilling a first tungsten electrode mounting hole 211 and a second tungsten electrode mounting hole 221 to ensure that the first tungsten electrode mounting hole and the second tungsten electrode mounting hole are coaxial with the gas injection port 222 on the sleeve 22.
S6, drilling and tapping the M3 top thread hole 215.
S7, the ground tungsten electrode 4 is installed in the first tungsten electrode installation hole 211 and the second tungsten electrode installation hole 221 and is tightly pressed through the fastening piece 5.
S8, screwing the contact tip 2 into the gun body 1.
S9, processing the 20J65 type valve body 6 into a finished product.
S10, after surfacing of the sealing surface of the valve seat 7 is finished, processing the valve seat 7 to a finished product, and wiping the position of the valve seat 7 embedded on the valve body 6 with alcohol and wiping the valve seat 7 with alcohol after the detection is qualified.
S11, embedding the valve seat 7 into the valve body 6, and ensuring that the gap between the bottom of the valve seat 7 and the valve body 6 is 0-0.5 mm.
S12, when the cables of the welding equipment are connected, the workpiece is connected with the anode of the argon arc welding machine, and the welding gun is connected with the cathode of the argon arc welding machine.
S13, fixing the simulation piece 8 (the simulation piece 8 is a simulation piece of a 20J65 type valve body) on a rotating device, extending an argon arc self-melting welding gun into the simulation piece 8, aligning the tungsten electrode 4 with the end part (the depth H) of the simulation piece 8, adjusting the height of the welding gun to enable the distance between the tungsten electrode 4 and the phi A hole to be 2.5-3 mm, keeping the argon arc self-melting welding gun still after the adjustment is completed, and taking down the simulation piece 8.
S14, fixing the 20J65 type valve body 6 with the valve seat 7 embedded on a rotating device, presetting appropriate welding current, pressing a high-frequency arc striking switch on an argon arc self-melting welding gun, and after electric arc is ignited, forming a welding pool at the joint flow channel part of the valve seat 7 and the valve body 6. After the workpiece rotates for a circle, the electric arc enables the flow passage part jointed with the valve seat 7 and the valve body 6 to form a complete circumferential welding seam.
As shown in fig. 7 and 8, the embodiment of the present invention provides another preparation and use process of an argon arc self-melting welding gun for a small-diameter deep hole:
s1, completing the machining of the sleeve 22 (without drilling the second tungsten electrode mounting hole 221).
S2, finishing the processing of the substrate 21 (not drilling the first tungsten electrode mounting hole 211 and not processing the M3 jackscrew hole 215).
And S3, assembling the sleeve 22 and the base body 21.
S4, completing the welding of the sleeve 22 and the base body 21.
S5, drilling a first tungsten electrode mounting hole 211 and a second tungsten electrode mounting hole 221 to ensure that the first tungsten electrode mounting hole and the second tungsten electrode mounting hole are coaxial with the gas injection port 222 on the sleeve 22.
S6, drilling and tapping the M3 top thread hole 215.
S7, the ground tungsten electrode 4 is installed in the first tungsten electrode installation hole 211 and the second tungsten electrode installation hole 221 and is tightly pressed through the fastening piece 5.
S8, screwing the contact tip 2 into the gun body 1.
S9, processing the 20J61 type valve body 6 into a finished product.
S10, after surfacing of the sealing surface of the valve seat 7 is finished, processing the valve seat 7 to a finished product, and wiping the position of the valve seat 7 embedded on the valve body 6 with alcohol and wiping the valve seat 7 with alcohol after the detection is qualified.
S11, embedding the valve seat 7 into the valve body 6, and ensuring that the gap between the bottom of the valve seat 7 and the valve body 6 is 0-0.5 mm.
S12, when the cables of the welding equipment are connected, the workpiece is connected with the anode of the argon arc welding machine, and the welding gun is connected with the cathode of the argon arc welding machine.
S13, fixing the simulation piece 8 (the simulation piece 8 is a simulation piece of a 20J61 type valve body) on a rotating device through a tool, extending a welding gun into the simulation piece 8, aligning the tungsten electrode 4 with the end part (the depth H) of the simulation piece 8, adjusting the height of the argon arc self-melting welding gun, enabling the distance between the tungsten electrode 4 and the phi A hole to be 2.5-3 mm, keeping the argon arc self-melting welding gun stationary after the adjustment is completed, and taking down the simulation piece 8.
S14, fixing the 20J61 type valve body 6 with the valve seat 7 embedded on a rotating device through a tool, presetting appropriate welding current, pressing a high-frequency arc striking switch on an argon arc self-melting welding gun, and forming a welding pool at a flow passage part where the valve seat 7 and the valve body 6 are attached after electric arc is struck. After the workpiece rotates for a circle, the electric arc enables the flow passage part jointed with the valve seat 7 and the valve body 6 to form a complete circumferential welding seam.
In practical application, if the distance between the tungsten electrode 4 and the flow channel is less than 2mm, short circuit is easy to form, and welding cannot be carried out. If the distance between the tungsten electrode 4 and the flow channel is more than 3mm, the gas protection effect is poor, and pores are easy to appear on the welding line. If the gap between the bottom of the valve seat 7 and the valve body 6 is larger than 0.5mm, the welding seam is easy to generate defects of grooves, insufficient welding, air holes and the like. If the oil stain between the bottom of the valve seat 7 and the valve body 6 is not cleaned, the welding seam is easy to have air hole defects.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. An argon arc self-melting welding gun for a small-caliber deep hole is characterized by comprising a conductive nozzle and a gun body;
the gun body is arranged at the rear end of the contact tube, and a first gas channel is arranged on the gun body;
the contact tube comprises a sleeve and a base body; the front end of the base body is provided with a first tungsten electrode mounting hole for mounting a tungsten electrode;
the sleeve is provided with a gas injection port at a position corresponding to the first tungsten electrode mounting hole; a first annular boss and a second annular boss are arranged at two ends of the base body; two ends of the sleeve are respectively connected with the first annular boss and the second annular boss, so that an air storage cavity is formed between the sleeve and the base body;
and a second gas channel is arranged on the base body, the rear end of the second gas channel is communicated with the first gas channel, and the front end of the second gas channel is communicated with the gas storage cavity.
2. The argon arc self-fluxing welding gun according to claim 1, wherein the gun body is detachably connected with the rear end of the contact tube.
3. The argon arc self-fluxing welding gun according to claim 2, wherein an outer wall of a rear end of the contact tube tip is provided with an external thread;
the rifle body is provided with the mounting hole, the inner wall of mounting hole is provided with the internal thread, the external screw thread with the internal thread cooperation is connected.
4. The argon arc self-fluxing welding gun according to claim 1, wherein the second annular boss comprises a first boss and a second boss which are integrally arranged;
the first boss faces one side of the first annular boss;
the diameter size of the first boss is smaller than that of the second boss;
the second end of the sleeve is sleeved on the first boss, and the end face of the second end is abutted against the end face of the second boss.
5. The argon arc self-fluxing welding gun according to claim 4, wherein a first end of the sleeve is sleeved on the first annular boss.
6. The argon arc self-fluxing welding gun according to claim 5, wherein the outer diameter dimension of the sleeve is equal to the diameter dimension of the second boss.
7. The argon arc self-fluxing welding gun according to claim 1, wherein the second gas passage comprises a transverse gas passage and a longitudinal gas passage which are communicated;
the extension direction of the transverse gas channel is parallel to the axis of the substrate;
the longitudinal gas channels extend in a direction perpendicular to the axis of the transverse gas channels.
8. The argon arc self-fluxing welding gun according to claim 1, wherein an axis of the first tungsten electrode mounting hole is perpendicular to an axis of the base body.
9. The argon arc self-fluxing welding gun according to claim 8, wherein a second tungsten electrode mounting hole is formed in the sleeve and is coaxial with the first tungsten electrode mounting hole.
10. The argon arc self-fluxing welding gun according to claim 9, wherein a jackscrew hole is arranged on a front end face of the base body, and a fastening piece is installed in the jackscrew hole;
the front end of the fastener is used for tightly propping against the side wall of the tungsten electrode.
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| CN202021755816.2U CN212977076U (en) | 2020-08-21 | 2020-08-21 | Argon arc self-melting welding gun for small-diameter deep hole |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021755816.2U CN212977076U (en) | 2020-08-21 | 2020-08-21 | Argon arc self-melting welding gun for small-diameter deep hole |
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