Process method for paving and welding hard alloy on surface of milling pen point for well repair

Abstract

The invention provides a process method for paving and welding hard alloy on the surface of a milling pen point for well repair. A groove is machined in the position range of paving and welding the hard alloy on the surface of a milling pen point tool along the surface contour of the milling pen point tool; then, after the position where the hard alloy is laid and welded on the surface of the milling pen point tool is preheated through oxygen-acetylene flames, a copper alloy layer is laid and welded to serve as a transition layer; laying and welding a hard alloy laying and welding layer at a hard alloy laying and welding position on the surface of the milling nib tool containing the transition layer; by optimizing the structural design and process of the milling pen point laid welding hard alloy particles, the bonding strength of the hard alloy layer and the milling pen point base body is improved, the residual stress of the laid welding position of the hard alloy is reduced, the formation of cracks at the laid welding position of the hard alloy is avoided, the accidents that a hard alloy block falls off and the milling pen point is fractured are reduced, and the service life of the milling pen point is prolonged. And the service life of the milling pen point is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of well repair tool manufacturing in the petroleum and natural gas industry, and in particular relates to a process for welding a hard alloy welding rod on the surface of a well repair tool. Background Art

[0002] With the continuous development of science and technology, automation technology is increasingly used in well repair work. Well repair is a dangerous job because the underground environment is complex and changeable. Researchers need to pay attention to the safety performance of the milling pen tip to prevent accidents. The material selection of the milling pen tip is crucial to the efficiency and durability of well repair work. Currently, researchers are exploring new wear-resistant materials to improve the service life and performance of the milling pen tip. Well repair work usually requires cutting and grinding on high-strength rocks or the surface of underground equipment, so the wear resistance of the milling pen tip is an important issue. If the pen tip is not wear-resistant enough, it will lead to frequent replacement of the pen tip and increase the cost of well repair.

[0003] In addition, the milling function of the milling pen tip on the damaged pipe column is mainly achieved by the hard alloy particles welded on its surface. Generally, the milling pen tip tool is made of alloy steel to make the base shape, and then a layer of hard alloy particles is inlaid or sprayed at the position of the pen tip milling pipe column. Since the hard alloy particles are hard and brittle, have weak impact resistance, and have great differences in properties with the steel matrix, accidents such as hard alloy particles falling off and breaking at the welding position of the milling pen tip are easy to occur during the milling operation, which seriously affects the service life and repair effect of the milling pen tip. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a process method for welding hard alloy on the surface of a grinding and milling pen tip tool for well repair by oxygen-acetylene flame, thereby improving the bonding strength between the hard alloy and the steel substrate and reducing the occurrence of accidents such as shedding of the hard alloy welding layer and breakage of the grinding and milling pen tip.

[0005] The present invention is achieved through the following technical solutions:

[0006] A process for welding hard alloy on the surface of a milling pen tip for well repairing, comprising:

[0007] S1, determining the position range of the hard alloy welded on the surface of the milling pen tip tool;

[0008] S2, machining a groove along the surface contour of the milling pen tip tool within the range of the position where the hard alloy is welded on the surface of the milling pen tip tool;

[0009] S3, using an oxygen-acetylene flame to preheat the hard alloy welding position on the surface of the milling pen tip tool, and then welding a copper alloy layer as a transition layer;

[0010] S4, welding a hard alloy welding layer at a position where the hard alloy is welded on the surface of the milling pen tip tool containing the transition layer, so as to complete the filling of the groove on the surface of the milling tool;

[0011] S5, after the grinding and milling pen tip tool with hard alloy paving and welding is inspected and stress-relieved, anti-rust paint is applied on the surface and marking is performed, thereby completing the product processing of the grinding and milling pen tip tool.

[0012] Preferably, the distance between the position where the hard alloy is welded and the tip of the milling pen is greater than 200 mm; the distance between the position where the hard alloy is welded and the part where the thread connecting the milling pen tip disappears is greater than 40 mm.

[0013] Preferably, the depth of the groove is 1 mm-3 mm, and the groove transitions to the outer surface contour of the milled pen tip at an angle of 120°-160°.

[0014] Preferably, the preheating temperature is 200-400°C.

[0015] Preferably, the oxygen pressure in the oxygen-acetylene flame is 0.20 MPa-0.35 MPa; the acetylene pressure is 0.05-0.1 MPa, and the flow ratio of oxygen to acetylene is adjusted to 1.22-1.30:1.

[0016] Preferably, the copper alloy layer has a thickness of 0.2-1.0 mm.

[0017] Preferably, the copper alloy layer is welded using a copper-zinc welding wire with a diameter of 1.2 mm-2 mm.

[0018] Preferably, in said S4, the number of hard alloy welding layers is determined according to the target thickness of the welding layer of the milling pen tip tool,

[0019] If the target thickness of the hard alloy welding layer is 7-12mm, the welding rod with a particle size of 1mm-3mm of hard alloy is melted by oxygen-acetylene flame to weld the first layer of hard alloy at the position of welding hard alloy on the surface of the milling pen tip tool. The thickness of the first layer of hard alloy is 2mm-5mm, and the groove on the surface of the milling tool is filled. Then, the welding rod with a particle size of 3mm-5mm of hard alloy is melted by oxygen-acetylene flame, and the second layer of hard alloy is welded on the first layer of hard alloy. The thickness of the second layer of hard alloy is 4mm-7mm, so that the total thickness of the hard alloy welding layer meets the target layer requirement; and the heating temperature of the milling pen tip substrate during the welding process shall not exceed 700°C;

[0020] If the target thickness of the hard alloy welding layer is 4-7mm, the welding rod with a particle size of 1mm-3mm of hard alloy is melted by oxygen-acetylene flame to weld the first layer of hard alloy at the position of welding hard alloy on the surface of the milling pen tip tool. The thickness of the first layer of hard alloy is 2mm-5mm to complete the filling of the groove on the surface of the milling tool. During the welding process, the heating temperature of the milling pen tip substrate shall not exceed 700℃.

[0021] Preferably, in said S5, the outer diameter of the milling pen tip after hard alloy paving welding is controlled, detected and processed by detecting the inner hole of the tool, wherein the inner diameter of the detection tool is based on the outer diameter control value of the milling pen tip, the lower deviation is 0mm, and the upper deviation is 1.5mm;

[0022] The bottom substrate of the hard alloy welding layer of the grinding and milling pen tip tool is non-destructively tested by ultrasonic testing. The test reference sample is a 3mm groove, and no cracks extending to the grinding and milling pen tip substrate are allowed to exist.

[0023] Preferably, the milling pen tip tool that has completed the hard alloy welding is subjected to stress relief treatment by heating in a furnace, the stress relief temperature is 300±20° C., the insulation time is 60 min-90 min, and the tool is cooled in the furnace.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] The present invention provides a process method for welding hard alloy on the surface of a milling pen tip for well repairing. In order to improve the bonding performance of hard alloy particles with a steel substrate and improve the service life of the hard alloy layer, a groove is machined along the surface contour of the milling pen tip tool within the range of the hard alloy welding position on the surface of the milling pen tip tool; the position of the hard alloy welding on the surface of the milling pen tip tool is preheated by an oxygen-acetylene flame, and then a copper alloy layer is welded as a transition layer; a hard alloy welding layer is welded at the position of the hard alloy welding on the surface of the milling pen tip tool containing the transition layer; so as to improve the bonding strength between the hard alloy and the steel substrate, reduce the occurrence of the hard alloy welding layer shedding and the milling pen tip fracture phenomenon, and thus improve the service life of the milling pen tip tool. The present invention optimizes the structural design and process of the milling pen tip welding hard alloy particles, improves the bonding strength between the hard alloy layer and the milling pen tip substrate, reduces the residual stress at the hard alloy welding position, avoids the formation of cracks at the welding hard alloy position, reduces the occurrence of hard alloy block falling and milling pen tip fracture accidents, and improves the service life of the milling pen tip.

[0026] Furthermore, the process method of the present invention determines the number of hard alloy welding layers according to the target thickness of the welding layer of the milling pen tip tool. If the target thickness of the welding layer is 7-12 mm, welding is performed in two layers. If the target thickness of the welding layer is 4-7 mm, welding is performed in one layer, so that the total thickness of the hard alloy welding layer meets the target layer requirement.

[0027] Furthermore, the welding range of the present invention should be greater than 200 mm from the tip of the milling pen tip, and greater than 40 mm from the position where the connecting thread of the milling pen tip disappears, so as to reduce the influence of the heat input of the welding hard alloy on the substrate at both ends of the milling pen tip. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Process flow chart for welding hard alloy on the surface of milling pen tip tools for well repair;

[0029] Figure 2 Schematic diagram of grinding the pen tip. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0031] (1) Figure 1 and Figure 2 As shown, first determine the position range 1 of the welding hard alloy on the surface of the milling pen tip tool, the welding range should be greater than 200mm from the tip 2 of the milling pen tip, and the distance from the disappearance position of the milling pen tip connection thread 3 should be greater than 40mm, so as to reduce the influence of the heat input of the welding hard alloy on the substrate at both ends of the milling pen tip;

[0032] (2) a groove with a depth of 1 mm to 3 mm is machined along the tool surface contour within the range 1 of the hard alloy welded on the surface of the milling pen tip, and the groove transitions to the outer surface contour of the milling pen tip at 120° to 160°;

[0033] (3) Using an oxygen-acetylene flame, preheat the welding position of the milling pen tip to 200-400°C, and use a copper-zinc welding wire with a diameter of 1.2 mm-2 mm to evenly weld a copper alloy layer with a thickness of about 0.2-1.0 mm as a transition layer;

[0034] (4) It should be further explained that the oxygen pressure is 0.20MPa-0.35MPa, the acetylene pressure is 0.05-0.1MPa, the flow ratio of oxygen and acetylene is adjusted to about 1.22-1.30:1, and the flame is controlled for preheating and copper wire transition layer welding.

[0035] (5) Determine the number of welding layers according to the target thickness of the welding layer of the milling pen tip tool. If the target thickness of the welding layer is 7-12 mm, perform welding in two layers in steps (6)-(7). If the target thickness of the welding layer is 4-7 mm, perform welding in step (7);

[0036] (6) Adjust the flow rate ratio of oxygen and acetylene to about 1.12-1.16:1, control the flame for welding, select a welding rod with a carbide particle size of 1mm-3mm, use a flame about 2mm-10mm away from the flame core to melt the welding rod metal and evenly weld a layer of carbide. The thickness of the welding layer is 2mm-5mm, and the machined grooves on the surface of the milling tool are filled. The heating temperature of the milling pen tip substrate during the welding process shall not exceed 700℃;

[0037] (7) Use a flame about 2mm-10mm away from the flame core to melt the weld layer with a hard alloy particle size of 3mm-5mm, and evenly weld a layer of hard alloy layer. The thickness of the 3mm-5mm hard alloy weld layer is 4mm-7mm, so that the total thickness of the hard alloy weld layer meets the target layer requirements;

[0038] (8) For the milling pen tip that has completed the hard alloy welding, the outer diameter control detection and processing of the weld layer of the milling pen tip of the hard alloy welding is carried out by passing through the inner hole of the detection tool. The inner diameter of the detection tool is based on the outer diameter control value of the milling pen tip, with a lower deviation of 0 mm and an upper deviation of 1.5 mm;

[0039] (9) The base of the hard alloy welding layer at the milling pen tip is non-destructively tested by ultrasonic testing. The reference sample for testing is a 3 mm groove. No cracks extending to the base of the milling pen tip are allowed to exist.

[0040] (10) For the milling pen tip that has completed the hard alloy paving welding, the stress relief treatment is carried out by heating in the furnace. The stress relief temperature is 300±20℃, the insulation time is 60min-90min, and the furnace is cooled;

[0041] (11) Anti-rust paint is applied to the surface, marking is performed, and the milling pen tip product processing is completed;

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] Embodiment 1:

[0044] This process method is used to weld a 11mm thick hard alloy layer on the surface of a Φ60-110mm milling pen tip. The specific scheme is as follows:

[0045] (1) First, determine the position range 1 of the welding hard alloy on the surface of the milling pen tip tool. The welding range is 300 mm away from the tip 2 of the milling pen tip and 50 mm away from the disappearance of the connecting thread 3 of the milling pen tip, so as to reduce the influence of the heat input of the welding hard alloy on the substrate at both ends of the milling pen tip. Figure 1 As shown;

[0046] (2) A groove with a depth of 2 mm is machined along the tool surface contour within the range 1 of the hard alloy welded on the surface of the milling pen tip, and the groove transitions to the outer surface contour of the milling pen tip at 120°;

[0047] (3) Using an oxygen-acetylene flame, the welding position of the milling pen tip is uniformly preheated to 300°C, and a copper-zinc welding wire with a diameter of 1.2 mm is used to uniformly weld a copper alloy layer with a thickness of about 0.5 mm as a transition layer;

[0048] (4) It should be further explained that the oxygen pressure is 0.20 MPa, the acetylene pressure is 0.05 MPa, the flow ratio of oxygen and acetylene is adjusted to about 1.25:1, and the flame is controlled for preheating and copper wire transition layer welding.

[0049] (5) A two-layer welding method is used according to the target thickness of the welding layer of the milling pen tip tool;

[0050] (6) Adjust the flow rate ratio of oxygen and acetylene to about 1.14:1, control the flame for welding, select a welding rod with a carbide particle size of 2 mm, use the flame to melt the welding rod metal within a range of about 5 mm from the flame core to evenly weld a layer of carbide, the thickness of the welding layer is 4 mm, and complete the filling of the machined grooves on the surface of the milling tool. During the welding process, the heating temperature of the milling pen tip substrate shall not exceed 700°C;

[0051] (7) Use a flame about 5 mm away from the flame core to melt the weld layer with a hard alloy particle size of 4 mm, and evenly weld a layer of hard alloy layer. The thickness of the 4 mm hard alloy weld layer is 7 mm, so that the total thickness of the hard alloy weld layer meets the target layer requirements;

[0052] (8) For the milling pen tip that has completed the hard alloy welding, the outer diameter control detection and processing of the hard alloy welding layer of the milling pen tip is carried out by passing through the inner hole of the detection tool. The inner diameter of the detection tool is based on the outer diameter control value of the milling pen tip tool, with a lower deviation of 0 mm and an upper deviation of 1.5 mm;

[0053] (9) The base of the hard alloy welding layer at the milling pen tip is non-destructively tested by ultrasonic testing. The reference sample for testing is a 3 mm groove. No cracks extending to the base of the milling pen tip are allowed to exist.

[0054] (10) The milling pen tip that has completed the hard alloy paving welding is subjected to stress relief treatment by heating in a furnace. The stress relief temperature is 320°C, the holding time is 90 minutes, and the pen tip is cooled with the furnace.

[0055] (11) Anti-rust paint is applied to the surface, marking is performed, and the milling pen tip product processing is completed;

[0056] Example 2

[0057] This process method is used to weld a hard alloy layer with a thickness of 8mm on the surface of the Φ60-106 milling pen tip. The specific scheme is as follows:

[0058] (1) First, determine the position range 1 of the welding hard alloy on the surface of the milling pen tip tool. The welding range is 500 mm away from the tip 2 of the milling pen tip and 60 mm away from the disappearance of the connecting thread 3 of the milling pen tip, so as to reduce the influence of the heat input of the welding hard alloy on the substrate at both ends of the milling pen tip. Figure 1 As shown;

[0059] (2) A groove with a depth of 3 mm is machined along the tool surface contour within the range 1 of the hard alloy welded on the surface of the milling pen tip, and the groove transitions to the outer surface contour of the milling pen tip at 160°;

[0060] (3) Using an oxygen-acetylene flame, the welding position of the milling pen tip is uniformly preheated to 400°C, and a copper-zinc welding wire with a diameter of 1.6 mm is used to uniformly weld a copper alloy layer with a thickness of about 0.7 mm as a transition layer;

[0061] (4) It should be further explained that the oxygen pressure is 0.25 MPa, the acetylene pressure is 0.06 MPa, the flow ratio of oxygen and acetylene is adjusted to about 1.30:1, and the flame is controlled for preheating and copper wire transition layer welding.

[0062] (5) Based on the target thickness of the welding layer of the milling pen tip tool, it is decided to use two layers of welding layer for welding;

[0063] (6) Adjust the flow ratio of oxygen and acetylene to about 1.16:1, control the flame for welding, select a welding rod with a carbide particle size of 3 mm, use the flame to melt the welding rod metal within a range of about 10 mm from the flame core to evenly weld a layer of carbide, the thickness of the welding layer is 5 mm, and complete the filling of the machined grooves on the surface of the milling tool. During the welding process, the heating temperature of the milling pen tip substrate shall not exceed 700 °C;

[0064] (7) Use a flame about 10 mm away from the flame core to melt the weld layer with a hard alloy particle size of 5 mm, and evenly weld a layer of hard alloy layer. The thickness of the 5 mm hard alloy weld layer is 5 mm, so that the total thickness of the hard alloy weld layer meets the target layer requirements;

[0065] (8) For the milling pen tip that has completed the hard alloy welding, the outer diameter control detection and processing of the hard alloy welding layer of the milling pen tip is carried out by passing through the inner hole of the detection tool. The inner diameter of the detection tool is based on the outer diameter control value of the milling pen tip tool, with a lower deviation of 0 mm and an upper deviation of 1.5 mm;

[0066] (9) The base of the hard alloy welding layer at the milling pen tip is non-destructively tested by ultrasonic testing. The reference sample for testing is a 3 mm groove. No cracks extending to the base of the milling pen tip are allowed to exist.

[0067] (10) The milling pen tip that has completed the hard alloy paving welding is subjected to stress relief treatment by heating in a furnace. The stress relief temperature is 280°C, the heat preservation time is 60 minutes, and the furnace is cooled;

[0068] (11) Anti-rust paint is applied to the surface, marking is performed, and the milling pen tip product processing is completed;

[0069] Example 3

[0070] This process method is used to grind the Φ40-95 nib and weld a 5mm thick hard alloy layer on the surface of the nib. The specific scheme is as follows:

[0071] (1) First, determine the position range 1 of the hard alloy welding on the surface of the milling pen tip tool. The welding range is 200 mm away from the tip 2 of the milling pen tip and 40 mm away from the disappearance of the connecting thread 3 of the milling pen tip, so as to reduce the influence of the heat input of the welding hard alloy on the substrate at both ends of the milling pen tip. Figure 1 As shown;

[0072] (2) A groove with a depth of 1 mm is machined along the tool surface contour within the range 1 of the hard alloy welded on the surface of the milling pen tip, and the groove transitions to the outer surface contour of the milling pen tip at 150°;

[0073] (3) Using an oxygen-acetylene flame, the welding position of the milling pen tip is uniformly preheated to 200°C, and a copper-zinc welding wire with a diameter of 2 mm is used to uniformly weld a copper alloy layer with a thickness of about 0.6 mm as a transition layer;

[0074] (4) It should be further explained that the oxygen pressure is 0.35 MPa, the acetylene pressure is 0.1 MPa, the flow ratio of oxygen and acetylene is adjusted to about 1.22:1, and the flame is controlled for preheating and copper wire transition layer welding.

[0075] (5) Select single-layer welding according to the target thickness of the welding layer of the milling pen tip tool;

[0076] (6) Adjust the flow ratio of oxygen and acetylene to about 1.12:1, control the flame for welding, use the flame to melt the weld layer with a size of 3mm of hard alloy particles within a range of about 2mm from the flame core, evenly weld a layer of hard alloy layer, the thickness of the 3mm hard alloy weld layer is 5mm, so that the total thickness of the hard alloy weld layer meets the target layer requirements, and the heating temperature of the milling pen tip substrate during the welding process shall not exceed 700℃;

[0077] (8) For the milling pen tip that has completed the hard alloy welding, the outer diameter control detection and processing of the hard alloy welding layer of the milling pen tip is carried out by passing through the inner hole of the detection tool. The inner diameter of the detection tool is based on the outer diameter control value of the milling pen tip tool, with a lower deviation of 0 mm and an upper deviation of 1.5 mm;

[0078] (9) The base of the hard alloy welding layer at the milling pen tip is non-destructively tested by ultrasonic testing. The reference sample for testing is a 3 mm groove. No cracks extending to the base of the milling pen tip are allowed to exist.

[0079] (10) The milling pen tip that has completed the hard alloy paving welding is subjected to stress relief treatment by heating in a furnace. The stress relief temperature is 300°C, the holding time is 80 minutes, and the furnace is cooled;

[0080] (11) Anti-rust paint is applied to the surface, marking is performed, and the milling pen tip product processing is completed;

[0081] Example 4

[0082] This process method is used to grind the Φ40-95 nib and weld a 4mm thick hard alloy layer on the surface of the nib. The specific scheme is as follows:

[0083] (1) First, determine the position range 1 of the hard alloy welding on the surface of the milling pen tip tool. The welding range is 200 mm away from the tip 2 of the milling pen tip and 40 mm away from the disappearance of the connecting thread 3 of the milling pen tip, so as to reduce the influence of the heat input of the welding hard alloy on the substrate at both ends of the milling pen tip. Figure 1 As shown;

[0084] (2) A groove with a depth of 1 mm is machined along the tool surface contour within the range 1 of the hard alloy welded on the surface of the milling pen tip, and the groove transitions to the outer surface contour of the milling pen tip at 120°;

[0085] (3) Using an oxygen-acetylene flame, the welding position of the milling pen tip is uniformly preheated to 220°C, and a copper-zinc welding wire with a diameter of 1.2 mm is used to uniformly weld a copper alloy layer with a thickness of about 0.2 mm as a transition layer;

[0086] (4) It should be further explained that the oxygen pressure is 0.20 MPa, the acetylene pressure is 0.05 MPa, the flow ratio of oxygen and acetylene is adjusted to about 1.22:1, and the flame is controlled for preheating and copper wire transition layer welding.

[0087] (5) Select single-layer welding according to the target thickness of the welding layer of the milling pen tip tool;

[0088] (6) Adjust the flow ratio of oxygen and acetylene to about 1.12:1, control the flame for welding, use the flame to melt the weld layer with a size of 3 mm of hard alloy particles within a range of about 2 mm from the flame core, evenly weld a layer of hard alloy layer, the thickness of the 3 mm hard alloy weld layer is 4 mm, so that the total thickness of the hard alloy weld layer meets the target layer requirements, and the heating temperature of the milling pen tip substrate during the welding process shall not exceed 700 ° C;

[0089] (8) For the milling pen tip that has completed the hard alloy welding, the outer diameter control detection and processing of the hard alloy welding layer of the milling pen tip is carried out by passing through the inner hole of the detection tool. The inner diameter of the detection tool is based on the outer diameter control value of the milling pen tip tool, with a lower deviation of 0 mm and an upper deviation of 1.5 mm;

[0090] (9) The base of the hard alloy welding layer at the milling pen tip is non-destructively tested by ultrasonic testing. The reference sample for testing is a 3 mm groove. No cracks extending to the base of the milling pen tip are allowed to exist.

[0091] (10) The milling pen tip that has completed the hard alloy paving welding is subjected to stress relief treatment by heating in a furnace. The stress relief temperature is 310°C, the holding time is 60 minutes, and the furnace is cooled;

[0092] (11) Anti-rust paint is applied to the surface, marking is performed, and the milling pen tip product processing is completed;

[0093] Example 5

[0094] This process method is used to grind the Φ40-95 nib and weld a 7mm thick hard alloy layer on the surface of the nib. The specific scheme is as follows:

[0095] (1) First, determine the position range 1 of the hard alloy welding on the surface of the milling pen tip tool. The welding range is 210 mm away from the tip 2 of the milling pen tip and 45 mm away from the disappearance of the connecting thread 3 of the milling pen tip, so as to reduce the influence of the heat input of the welding hard alloy on the substrate at both ends of the milling pen tip. Figure 1 As shown;

[0096] (2) A groove with a depth of 1.5 mm is machined along the tool surface contour within the range 1 of the hard alloy welded on the surface of the milling pen tip, and the groove transitions to the outer surface contour of the milling pen tip at 130°;

[0097] (3) Using an oxygen-acetylene flame, the welding position of the milling pen tip is uniformly preheated to 220°C, and a copper-zinc welding wire with a diameter of 1.4 mm is used to uniformly weld a copper alloy layer with a thickness of about 0.4 mm as a transition layer;

[0098] (4) It should be further explained that the oxygen pressure is 0.25 MPa, the acetylene pressure is 0.80 MPa, the flow ratio of oxygen and acetylene is adjusted to about 1.26:1, and the flame is controlled for preheating and copper wire transition layer welding.

[0099] (5) Select single-layer welding according to the target thickness of the welding layer of the milling pen tip tool;

[0100] (6) Adjust the flow ratio of oxygen and acetylene to about 1.13:1, control the flame for welding, use the flame to melt the weld layer with a size of 5 mm of hard alloy particles within a range of about 4 mm from the flame core, evenly weld the first layer of hard alloy layer, and the thickness of the 5 mm hard alloy weld layer is 7 mm, so that the total thickness of the hard alloy weld layer meets the target layer requirements. During the welding process, the heating temperature of the milling pen tip substrate shall not exceed 700 °C;

[0101] (8) For the milling pen tip that has completed the hard alloy welding, the outer diameter control detection and processing of the hard alloy welding layer of the milling pen tip is carried out by passing through the inner hole of the detection tool. The inner diameter of the detection tool is based on the outer diameter control value of the milling pen tip tool, with a lower deviation of 0 mm and an upper deviation of 1.5 mm;

[0102] (9) The base of the hard alloy welding layer at the milling pen tip is non-destructively tested by ultrasonic testing. The reference sample for testing is a 3 mm groove. No cracks extending to the base of the milling pen tip are allowed to exist.

[0103] (10) The milling pen tip that has completed the hard alloy paving welding is subjected to stress relief treatment by heating in a furnace. The stress relief temperature is 320°C, the holding time is 70 minutes, and the pen tip is cooled with the furnace.

[0104] (11) Anti-rust paint is applied to the surface, marking is performed, and the milling pen tip product processing is completed;

[0105] Example 6

[0106] This process method is used to weld a 14mm thick hard alloy layer on the surface of the Φ60-106 milling pen tip. The specific scheme is as follows:

[0107] (1) First, determine the position range 1 of the hard alloy welding on the surface of the milling pen tip tool. The welding range is 450 mm away from the tip 2 of the milling pen tip and 55 mm away from the disappearance of the connecting thread 3 of the milling pen tip, so as to reduce the influence of the heat input of the welding hard alloy on the substrate at both ends of the milling pen tip. Figure 1 As shown;

[0108] (2) A groove with a depth of 2.5 mm is machined along the tool surface contour within the range 1 of the hard alloy welded on the surface of the milling pen tip, and the groove transitions to the outer surface contour of the milling pen tip at 140°;

[0109] (3) Using an oxygen-acetylene flame, the welding position of the milling pen tip is uniformly preheated to 350°C, and a copper-zinc welding wire with a diameter of 2 mm is used to uniformly weld a copper alloy layer with a thickness of about 1.0 mm as a transition layer;

[0110] (4) It should be further explained that the oxygen pressure is 0.35 MPa, the acetylene pressure is 0.1 MPa, the flow ratio of oxygen and acetylene is adjusted to about 1.30:1, and the flame is controlled for preheating and copper wire transition layer welding.

[0111] (5) Based on the target thickness of the welding layer of the milling pen tip tool, it is decided to use two layers of welding layer for welding;

[0112] (6) Adjust the flow ratio of oxygen and acetylene to about 1.16:1, control the flame for welding, select a welding rod with a carbide particle size of 3 mm, use a flame about 8 mm away from the flame core to melt the welding rod metal and evenly weld the first layer of carbide. The thickness of the weld layer is 4 mm, and the machined grooves on the surface of the milling tool are filled. During the welding process, the heating temperature of the milling pen tip substrate shall not exceed 700 °C;

[0113] (7) Use a flame about 8 mm away from the flame core to melt the weld layer with a hard alloy particle size of 4 mm, and evenly weld the second hard alloy layer. The thickness of the 4 mm hard alloy weld layer is 7 mm, so that the total thickness of the hard alloy weld layer meets the target layer requirements;

[0114] (8) For the milling pen tip that has completed the hard alloy welding, the outer diameter control detection and processing of the hard alloy welding layer of the milling pen tip is carried out by passing through the inner hole of the detection tool. The inner diameter of the detection tool is based on the outer diameter control value of the milling pen tip tool, with a lower deviation of 0 mm and an upper deviation of 1.5 mm;

[0115] (9) The base of the hard alloy welding layer at the milling pen tip is non-destructively tested by ultrasonic testing. The reference sample for testing is a 3 mm groove. No cracks extending to the base of the milling pen tip are allowed to exist.

[0116] (10) The milling pen tip that has completed the hard alloy paving welding is subjected to stress relief treatment by heating in a furnace. The stress relief temperature is 300°C, the holding time is 90 minutes, and the furnace is cooled;

[0117] (11) Anti-rust paint is applied to the surface, marking is performed, and the milling pen tip product processing is completed;

[0118] Inspecting the inner hole of the tool can ensure that the outer diameter of the weld layer meets the requirements, thereby ensuring the quality and performance of the grinding and milling pen tip.

[0119] Here are the steps to perform this detection method:

[0120] 1. Prepare the testing tools: First, you need to prepare a set of suitable testing tools. This tool is usually an internal bore gauge or caliper with precise measurement scales. Ensure the accuracy and stability of the tool to ensure the accuracy of the measurement results.

[0121] 2. Install the milling pen tip into the inner hole of the detection tool: Place the milling pen tip to be tested into the inner hole of the detection tool. Make sure that the pen tip is in full contact with the inner hole of the tool and there is no looseness or rotation.

[0122] 3. Take measurements: Use a suitable handheld measuring tool (such as a vernier caliper) or a digital measuring instrument to measure the outer diameter of the welding layer of the milling pen tip. In the inner hole detection method, the outer diameter of the welding layer can be indirectly obtained by measuring the diameter of the inner hole.

[0123] 4. Check the measurement results: compare the measurement results with the design requirements or specifications. If the outer diameter of the weld layer is within the allowable range, it is considered that the milling pen tip has passed the test and the subsequent process can continue; if it exceeds the specified allowable range, appropriate treatment measures are required.

[0124] 5. Handling of unqualified products: If the outer diameter of the welding layer of the milling pen tip is found to be not in compliance with the requirements, timely measures should be taken to deal with it. Possible treatment methods include re-welding, grinding or elimination of unqualified products to ensure product quality.

[0125] 6. Record test results: For each milled pen tip test result, be sure to keep accurate records. These records will help track product quality and conduct quality control analysis.

[0126] The outer diameter control inspection of the welding layer of the milling pen tip by inner hole inspection is a commonly used non-destructive inspection method. It can monitor product quality in real time during the production process and detect and deal with problems in a timely manner. Ensuring that the outer diameter of the welding layer of the milling pen tip meets the requirements helps improve product quality and service life.

[0127] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0128] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A process for welding hard alloy on the surface of a milling pen tip for well repair, characterized in that: include, S1, determining the position range of the hard alloy welded on the surface of the milling pen tip tool; S2, machining a groove along the surface contour of the milling pen tip tool within the range of the position where the hard alloy is welded on the surface of the milling pen tip tool; S3, using an oxygen-acetylene flame to preheat the hard alloy welding position on the surface of the milling pen tip tool, and then welding a copper alloy layer as a transition layer; S4, welding a hard alloy welding layer at a position where the hard alloy is welded on the surface of the milling pen tip tool containing the transition layer, so as to complete the filling of the groove on the surface of the milling pen tip tool; S5, after the grinding and milling pen tip tool with hard alloy paving and welding is inspected and stress-relieved, anti-rust paint is applied on the surface and marking is performed, thereby completing the product processing of the grinding and milling pen tip tool.

2. The process for welding hard alloy on the surface of a milling pen tip for well repairing according to claim 1 is characterized in that: The distance between the position where the hard alloy is welded and the tip of the milling pen is greater than 200 mm; the distance between the position where the hard alloy is welded and the part where the thread connecting the milling pen tip disappears is greater than 40 mm.

3. The process for welding hard alloy on the surface of a milling pen tip for well repairing according to claim 1, characterized in that: The depth of the groove is 1 mm-3 mm, and the groove transitions to the outer surface contour of the milled pen tip at an angle of 120°-160°.

4. The process for welding hard alloy on the surface of a milling pen tip for well repairing according to claim 1, characterized in that: The preheating temperature is 200-400°C.

5. The process for welding hard alloy on the surface of a milling pen tip for well repairing according to claim 1, characterized in that: The oxygen pressure in the oxygen-acetylene flame is 0.20MPa-0.35MPa; the acetylene pressure is 0.05-0.1MPa, and the flow ratio of oxygen to acetylene is adjusted to 1.22-1.30:

1.

6. The process for welding hard alloy on the surface of a milling pen tip for well repairing according to claim 1, characterized in that: The copper alloy layer has a thickness of 0.2-1.0 mm.

7. The process for welding hard alloy on the surface of a milling pen tip for well repairing according to claim 1, characterized in that: The copper alloy layer is welded using copper-zinc welding wire with a diameter of 1.2 mm to 2 mm.

8. The process for welding hard alloy on the surface of a milling pen tip for well repairing according to claim 1, characterized in that: In said S4, the number of hard alloy welding layers is determined according to the target thickness of the welding layer of the milling pen tip tool; If the target thickness of the hard alloy welding layer is 7-12mm, the welding rod with a particle size of 1mm-3mm of hard alloy is melted by oxygen-acetylene flame to weld the first layer of hard alloy at the position of welding hard alloy on the surface of the milling pen tip tool. The thickness of the first layer of hard alloy is 2mm-5mm, and the groove on the surface of the milling tool is filled. Then, the welding rod with a particle size of 3mm-5mm of hard alloy is melted by oxygen-acetylene flame, and the second layer of hard alloy is welded on the first layer of hard alloy. The thickness of the second layer of hard alloy is 4mm-7mm, so that the total thickness of the hard alloy welding layer meets the target layer requirement; and the heating temperature of the milling pen tip substrate during the welding process shall not exceed 700°C; If the target thickness of the hard alloy welding layer is 4-7mm, an oxygen-acetylene flame is used to melt the welding rod with a hard alloy particle size of 3mm-5mm, and a layer of hard alloy is welded at the hard alloy welding position on the surface of the grinding and milling pen tip tool. The thickness of the hard alloy layer is 4mm-7mm, so that the total thickness of the hard alloy welding layer meets the target layer requirements; and the heating temperature of the grinding and milling pen tip base during the welding process shall not exceed 700℃.

9. The process for welding hard alloy on the surface of a milling pen tip for well repairing according to claim 1, characterized in that: In the step S5, the outer diameter of the milling pen tip after hard alloy paving welding is controlled, detected and processed by detecting the inner hole of the tool, wherein the inner diameter of the detection tool is used as a reference to the outer diameter control value of the milling pen tip, the lower deviation is 0 mm, and the upper deviation is 1.5 mm; The bottom substrate of the hard alloy welding layer of the grinding and milling pen tip tool is non-destructively tested by ultrasonic testing. The test reference sample is a 3mm groove, and no cracks extending to the grinding and milling pen tip substrate are allowed to exist.

10. The process for welding hard alloy on the surface of a milling pen tip for well repairing according to claim 1, characterized in that: The stress relief treatment of the grinding and milling pen tip tool after the hard alloy welding is carried out by furnace heating. The stress relief temperature is 300±20℃, the insulation time is 60min-90min, and the tool is cooled with the furnace.

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