A brazing method for repairing non-through cracks on a part surface

Abstract

The application discloses a kind of part surface non-through crack brazing quick repair method, comprising the following steps: removing crack, correspondingly form notch on part surface at corresponding crack position;Positioning blind hole is machined in part at notch, so that positioning blind hole covers notch, and the depth of positioning blind hole is not less than the maximum depth of notch;According to the size of positioning blind hole, roll out brazing filler metal roll;Brazing filler metal roll is inserted into positioning blind hole;Heat and melt brazing filler metal roll to carry out crack welding repair.The part surface non-through crack brazing quick repair method provided in the application, positioning blind hole can accommodate molten brazing filler metal, avoid the phenomenon of brazing filler metal turbulent flow, brazing filler metal is concentrated in the position to be welded to ensure that brazing filler metal is sufficient, and because brazing filler metal roll is sheet, brazing filler metal spatter phenomenon will not occur due to local heating deformation of part, with the help of brazing filler metal roll, brazing filler metal amount can be controlled more accurately, avoid the phenomenon of brazing filler metal turbulent flow caused by too much brazing filler metal, finally ensure welding repair effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brazing rapid repair, in particular to a brazing rapid repair method for non-penetrating cracks on the surface of a part. BACKGROUND

[0002] The blades of an aero-engine or a gas turbine are prone to cracks, corrosion, wear and other obvious defects due to the interaction of wear, impact, high-temperature gas and cold and hot fatigue, etc., which leads to the early retirement of the blades or induces major accidents. Among various defects, cracks are the main cause of blade retirement.

[0003] For cracks on the blades, welding technology is usually used for repair. The welding repair technology for cracks on the blades mainly includes fusion welding, powder metallurgy and brazing diffusion welding repair technology. Among them, the fusion welding technology is mainly used for repairing cobalt-based and nickel-based high-temperature alloy blades with good weldability, but the welding residual stress of fusion welding seriously restricts the service effect of the repaired blades; the powder metallurgy repair technology is mainly for large-gap cracks; the brazing repair technology has unique advantages such as avoiding the generation of crystalline cracks, no large deformation and residual stress during overall heating, and repairing multiple cracks in multiple parts, and is more flexible and economical and practical for processing small cracks on the blades.

[0004] However, in the conventional vacuum brazing repair technology for micro-cracks on the surface of the blades, the amount of brazing filler metal is difficult to control during the repair process, and the local deformation of the part occurs during heating and welding, which is prone to the splashing and turbulent flow of the brazing filler metal, resulting in insufficient brazing filler metal at the welding position, and finally leading to poor repair effect of the cracks.

[0005] In view of the shortcomings of the conventional vacuum brazing repair technology, it is necessary to design a brazing rapid repair method for non-penetrating cracks on the surface of a part. SUMMARY

[0006] Therefore, the technical problem to be solved by the present application is that in the conventional vacuum brazing repair technology, the amount of brazing filler metal is difficult to control during the repair process, and the local deformation of the part occurs during heating and welding, which is prone to the splashing and turbulent flow of the brazing filler metal, resulting in insufficient brazing filler metal at the welding position, and finally leading to poor repair effect of the cracks, so as to provide a brazing rapid repair method for non-penetrating cracks on the surface of a part.

[0007] To solve the above technical problems, the technical scheme of the present application is as follows:

[0008] A brazing rapid repair method for non-penetrating cracks on the surface of a part, comprising the following steps:

[0009] Removing the cracks, and correspondingly forming a notch on the surface of the part at the position corresponding to the cracks;

[0010] A positioning blind hole is processed in the part at the gap, the positioning blind hole covers the gap, and the depth of the positioning blind hole is not less than the maximum depth of the gap;

[0011] A filler material coil is coiled according to the size of the positioning blind hole;

[0012] The filler material coil is inserted into the positioning blind hole;

[0013] The filler material coil is heated and melted for crack welding repair.

[0014] Further, the filler material coil is made of amorphous thin strip filler material coil.

[0015] Further, after the filler material coil is inserted into the positioning blind hole, powder filler material is filled into the gap between the layers of the filler material coil.

[0016] Further, before the filler material coil is inserted into the positioning blind hole, powder filler material is filled into the positioning blind hole.

[0017] Further, when the filler material coil is coiled according to the size of the positioning blind hole, one end of the filler material coil is recessed inward to form a recessed portion, and the other end is protruded outward to form a protruded portion, and the protruded portion is adapted to face the inner bottom wall of the positioning blind hole.

[0018] Further, after the filler material coil is inserted into the positioning blind hole, the top surface of the powder filler material in the positioning blind hole is not higher than the top end of the protruded portion.

[0019] Further, after the filler material coil is inserted into the positioning blind hole, powder filler material is filled into the recessed portion.

[0020] Further, after the filler material coil is inserted into the positioning blind hole, a mica or quartz or sapphire material baffle or block is fixed on the lower side of the surface of the part, so that the mica or quartz or sapphire material baffle or block is close to and higher than the filler material coil.

[0021] Further, when the filler material coil is heated and melted for crack welding, the temperature is kept at a first temperature 20-30℃ lower than the melting temperature of the filler material for 5-10 minutes, then heated to a second temperature at which the filler material is melted, and kept for 20-30 minutes.

[0022] Further, when the filler material coil is heated and melted for crack welding, high-frequency induction heating is adopted.

[0023] The technical scheme of the present application has the following advantages:

[0024] 1. The application provides a kind of part surface non-through crack brazing quick repair method, remove crack, correspondingly form notch on the surface of blade at the position corresponding crack;Positioning blind hole is processed into blade at notch, so that positioning blind hole covers notch, and the depth of positioning blind hole is not less than the maximum depth of notch;According to the size of positioning blind hole, roll out brazing filler metal roll, so that the amount of brazing filler metal can be more accurately controlled;Brazing filler metal roll is inserted into positioning blind hole;Crack welding repair is carried out by heating and melting brazing filler metal roll, so that positioning blind hole can accommodate molten brazing filler metal, avoid the phenomenon of brazing filler metal turbulent flow, and brazing filler metal is concentrated in the position to be welded to ensure sufficient amount of brazing filler metal, and since brazing filler metal roll is sheet structure, brazing filler metal spatter phenomenon will not occur due to local heating deformation of part, in addition, brazing filler metal amount can be more accurately controlled by brazing filler metal roll, avoid the phenomenon of brazing filler metal turbulent flow caused by excessive brazing filler metal, and finally ensure the welding repair effect.

[0025] 2. The application provides a kind of part surface non-through crack brazing quick repair method, after brazing filler metal roll is inserted into positioning blind hole, the gap between the layers of the brazing filler metal roll is filled with powder brazing filler metal, and the recess of the brazing filler metal roll is filled with powder brazing filler metal, which can increase the supply of brazing filler metal amount, and can control the amount of brazing filler metal by the gap between the layers of the brazing filler metal roll and the recess, to reduce the phenomenon of brazing filler metal spatter or turbulent flow. In addition, the gap between the layers of the brazing filler metal roll forms a brazing filler metal channel, and the powder brazing filler metal filled in the recess and the gap between the layers of the brazing filler metal roll can naturally flow into the positioning blind hole along the brazing filler metal channel under the action of capillary or its own gravity after being heated and melted, and the positioning blind hole receives these melted powder brazing filler metal, to reduce the phenomenon of turbulent flow of melted powder brazing filler metal out of the positioning blind hole, and the melted powder brazing filler metal flows into the positioning blind hole from top to bottom, which can also push the melted powder brazing filler metal in the positioning blind hole, promote the spread of brazing filler metal to all parts of the positioning blind hole, improve the density of the welding repair part, and further improve the welding repair quality.

[0026] 3. The application provides a kind of part surface non-through crack brazing quick repair method, after brazing filler metal roll is inserted into positioning blind hole, mica or quartz or sapphire material baffle or block is fixed on the lower side of the surface of blade, so that the mica or quartz or sapphire material baffle or block is close to brazing filler metal roll and higher than brazing filler metal roll, to block the melted brazing filler metal from turbulent flow to the lower surface, ensure sufficient amount of brazing filler metal required at the position to be welded on the surface, and ensure the welding repair effect.

[0027] 4. The present invention provides a method for rapid brazing repair of non-penetrating cracks on the surface of a part. After inserting the brazing filler metal roll into the positioning blind hole, the top surface of the powder brazing filler metal in the positioning blind hole is not higher than the top of the protrusion. In this way, after the powder brazing filler metal in the positioning blind hole melts into liquid, its volume will decrease, forming a gap below the protrusion. The existence of the gap is conducive to receiving the molten powder brazing filler metal in the recess and the powder brazing filler metal molten between the layers of the brazing filler metal roll. It can also help increase the kinetic energy of the powder brazing filler metal molten in the recess and gap entering the positioning blind hole, better promoting the flow and spread of the molten powder brazing filler metal in the positioning blind hole to all parts of the positioning blind hole, further improving the filling density of the brazing filler metal in the positioning blind hole, and improving the brazing repair quality.

[0028] 5. The present invention provides a method for rapid repair of non-penetrating cracks on the surface of a part by brazing. During the heating process, a holding time of 5 min to 10 min is set at a first temperature 20℃ to 30℃ below the melting temperature of the brazing filler metal to allow the filler metal to fully reach the pre-melting state without turbulent flow. Then the filler metal is heated to a second temperature that melts the filler metal and held for 20 min to 30 min. In this way, turbulent flow can be reduced and the welding time can be shortened.

[0029] 6. The present invention provides a method for rapid brazing repair of non-penetrating cracks on the surface of parts. It uses high-frequency induction heating, which can perform local repair. The equipment used for repair is small in size, the welding repair process is simple, the energy consumption is small, the requirements for the welding environment are not high, and multiple cracks can be repaired by welding. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a flowchart of a method for rapid brazing repair of non-penetrating cracks on the surface of a part according to the present invention;

[0032] Figure 2 This is a schematic diagram of the cracked blade in this invention;

[0033] Figure 3 This is a schematic diagram of the blade after the positioning blind hole has been machined in this invention;

[0034] Figure 4 This is a schematic diagram of the structure of the solder roll in this invention;

[0035] Figure 5Fig. 1 is a schematic view of the position of the mica baffle and the blade and filler coil in the present application.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 1, blade; 11, crack; 12, positioning blind hole; 13, notch; 2, filler coil; 21, recess; 22, protrusion; 3, mica baffle. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0042] EMBODIMENT

[0043] As Figures 1 to 5 shown, the present embodiment provides a method for quickly repairing non-penetrating cracks on the surface of a part, which will be described below by taking the repair of non-penetrating cracks on the surface of a blade as an example. Of course, it can also be used to repair non-penetrating cracks on the surface of other metal parts, including the following steps:

[0044] The crack 11 is removed by mechanical polishing or air gouging, a notch 13 is formed on the surface of the blade 1 corresponding to the position of the crack 11, and the maximum length of the notch 13 is determined, the notch 13 covers the crack 11, and the depth of the notch 13 is not less than the maximum depth of the crack 11, so as to ensure that the crack 11 is completely removed; of course, the area and depth of the notch 13 need to be reasonably selected considering the economic factors and other practical factors, which are not specifically limited here;

[0045] The surface of the notch 13 is polished by a drill to process a positioning blind hole 12 in the blade 1 at the notch 13, and the processing surface of the positioning blind hole 12 is metal luster, in the embodiment, the positioning blind hole 12 is a standard cylindrical hole, the diameter of the standard cylindrical hole is determined by the maximum length of the notch 13, and the diameter of the standard cylindrical hole is comparable to or slightly larger than the maximum length of the notch 13 considering the economic factors and other practical factors; of course, the positioning blind hole 12 can also be a non-standard cylindrical hole; the depth of the positioning blind hole 12 is not less than the maximum depth of the notch 13;

[0046] The positioning blind hole 12 is cleaned;

[0047] The filler material roll 2 is rolled according to the size of the positioning blind hole 12, in the embodiment, the filler material roll 2 is rolled according to the diameter and depth of the standard cylindrical hole, so as to facilitate the control of the amount of filler material, in the embodiment, the filler material roll 2 is rolled by amorphous thin strip filler material with a thickness of 0.2mm-0.8mm, the middle part of the upper end of the filler material roll 2 is inwardly recessed to form a recessed part 21, the recessed part 21 is used to contain the powder filler material, and the lower end of the filler material roll 2 is outwardly protruded to form a protruded part 22, in the embodiment, the protruded part 22 is conical, which can facilitate the insertion of the filler material roll 2 into the positioning blind hole 12;

[0048] The powder filler material is laid in the positioning blind hole 12, and the filling height value of the powder filler material is 0.4-0.6 times the height value of the protruded part 22, preferably, the filling height value is 0.5 times the height value of the protruded part 22 of the filler material roll; of course, the filling height of the powder filler material is not specifically limited here, which can be set according to the actual situation;

[0049] The brazing filler metal coil 2 is inserted into the positioning blind hole 12, and the top end of the brazing filler metal coil 2 protrudes from the positioning blind hole 12. Since the brazing filler metal coil 2 is made of an amorphous thin strip brazing filler metal coil, after the hand is loosened, the brazing filler metal coil 2 will be unfolded to a certain extent to interfere with the inner wall of the positioning blind hole 12, so that the brazing filler metal coil 2 can be stopped at the appropriate position, the powder brazing filler metal is filled and compacted at the gap between the layers of the brazing filler metal coil 2, and the powder brazing filler metal is filled into the recess 21 of the brazing filler metal coil 2. There are three forms of the brazing filler metal coil 2 inserted into the positioning blind hole 12. The first form is that the bottom end of the protruding part 22 is higher than the top surface of the powder brazing filler metal in the positioning blind hole 12, and the protruding part 22 will form a large gap with the top surface of the powder brazing filler metal in the positioning blind hole 12. The second form is that the brazing filler metal coil 2 is placed on the top surface of the powder brazing filler metal in the positioning blind hole 12. At this time, the new top surface of the powder brazing filler metal in the positioning blind hole 12 is basically consistent with the original top surface of the powder brazing filler metal, and a gap will still be formed between the top surface of the powder brazing filler metal below the protruding part 22 and the positioning blind hole 12. Preferably, the filling thickness value of the powder brazing filler metal in the positioning blind hole 12 is 0.4-0.6 times the height value of the protruding part 22 of the brazing filler metal coil 2. The third form is that the protruding part 22 of the brazing filler metal coil 2 is deeply inserted into the powder brazing filler metal in the positioning blind hole 12. The insertion process will inevitably cause the powder brazing filler metal in the positioning blind hole 12 to move upward, so that the new top surface of the powder brazing filler metal is higher than the original top surface of the powder brazing filler metal. The new top surface of the powder brazing filler metal is not higher than the top end of the protruding part 22. In the third form, after the powder brazing filler metal in the positioning blind hole 12 is melted, a gap will also appear between the protruding part 22 and the melted powder brazing filler metal. The gap is beneficial to receiving the melted powder brazing filler metal in the recess 21 and the melted powder brazing filler metal between the layers of the brazing filler metal coil 2. The gap in the first form and the second form will be further increased after the powder brazing filler metal in the positioning blind hole 12 is melted, and correspondingly, it is more beneficial to receiving the melted powder brazing filler metal in the recess 21 and the melted powder brazing filler metal between the layers of the brazing filler metal coil 2. Moreover, due to the existence of the gap, the kinetic energy of the melted powder brazing filler metal in the recess 21 and the gap between the layers of the brazing filler metal coil 2 entering the positioning blind hole 12 can be improved, the melted brazing filler metal is better promoted to flow and spread everywhere in the positioning blind hole 12, the filling density of the brazing filler metal in the positioning blind hole 12 is further improved, and the brazing repair quality is improved. If the crack 11 is at the curved surface or inclined surface of the blade 1, the mica baffle 3 is fixed at the lower side of the curved surface or inclined surface of the blade 1, so that the mica baffle 3 is close to the brazing filler metal coil 2 and higher than the brazing filler metal coil 2. Preferably, the mica baffle 3 is tightly attached to the brazing filler metal coil 2 to intercept the melted brazing filler metal, avoid the turbulent flow of the melted brazing filler metal to the lower side of the curved surface or inclined surface, ensure the sufficient brazing filler metal at the to-be-welded position of the curved surface or inclined surface, and finally improve the welding effect. The brazing filler metal coil 2 can also be limited by the powder brazing filler metal in the positioning blind hole 12 to reduce the risk of the brazing filler metal coil 2 tilting after being inserted into the positioning blind hole 12, so that the powder brazing filler metal in the recess 21 at the upper end of the brazing filler metal coil 2 flows out. Of course, the mica baffle 3 can also be replaced by a mica block, or a baffle or block made of quartz or sapphire material.

[0050] Crack repair is achieved by heating and melting the brazing filler metal coil 2 and powder brazing filler metal using high-frequency induction heating. Specifically, the brazing temperature is determined by both the liquidus temperature of the brazing filler metal and the melting point of the base metal. The brazing temperature should be 20-30°C higher than the liquidus temperature of the brazing filler metal, while the liquidus temperature of the brazing filler metal should be 30-40°C lower than the solidus temperature of the base metal. The brazing process is determined by setting a holding time of 5-10 minutes at a first temperature 20-30°C lower than the melting temperature of the brazing filler metal to allow the brazing filler metal to fully reach a pre-melted state without turbulence. Then, the heating temperature is rapidly increased to a second temperature that melts the brazing filler metal, and the second temperature is held for 20-30 minutes. This reduces the risk of turbulence and shortens the welding time. The winding, thickness, number of turns, and shape of the induction coil used for high-frequency induction can be determined according to the length and location of the crack.

[0051] The heating of the induction coil is quickly removed, and the brazing filler metal cools rapidly to complete the crack welding repair. The entire welding repair process is controlled within 40 minutes.

[0052] After welding is completed, the brazing quality is evaluated. In this embodiment, the welding repair quality evaluation includes the evaluation of the appearance quality of the weld joint and the evaluation of the internal quality of the weld joint. The evaluation of the appearance quality of the weld joint mainly includes evaluating the wettability of the weld joint, the surface condition of the weld joint, the condition of the base metal, and the condition of the brazing filler metal near the weld joint. When welding defects occur, repair welding needs to be performed in time, and the welding repair quality evaluation is carried out again after repair welding.

[0053] The blade 1 is shaped according to its curved surface to make the appearance of the repaired blade 1 as consistent as possible with that of the blade 1 before the crack 11 was generated.

[0054] The position of blade 1 can be adjusted to complete the welding repair of cracks 11 at different locations on the same blade 1, or the position of induction coil can be adjusted to complete the welding repair of cracks 11 on other blades 1, so as to achieve sequential, free and fast brazing repair of multiple cracks.

[0055] In this embodiment, amorphous thin-strip brazing filler metal is chosen to roll brazing filler metal roll 2 because it offers significant advantages over conventional brittle powder, wire, sheet, paste, and rod-shaped brazing filler metals, resulting in higher weld repair quality. Specifically, the advantages of amorphous thin-strip brazing filler metal compared to conventional brittle powder, wire, sheet, and rod-shaped brazing filler metals are as follows:

[0056] 1) The weld structure and composition are uniform. The brazing filler metal is rapidly cooled from the liquid state to form a solid brazing filler metal. The composition of the solid brazing filler metal maintains the uniformity of the liquid brazing filler metal. There are no grains or eutectic phases precipitated, and the melting is relatively uniform.

[0057] 2) The brazing filler metal is pure, the joint quality is high, and the preparation of the brazing filler metal does not require forging, rolling, drawing, or other processes. The brazing filler metal has low impurity content and high purity.

[0058] 3) The brazing filler metal has good flexibility and is easy to use. It can be well accommodated in gaps such as positioning blind holes 12, reducing brazing filler metal waste. In addition, it has strong composition adjustability, and the composition of the master alloy can be easily adjusted to obtain amorphous brazing filler metals with different compositions.

[0059] 4) The brazing filler metal has good wettability and fluidity, and melts and spreads almost simultaneously and uniformly during the heating process;

[0060] 5) Thinner brazing filler metal strips are thinner, allowing for smaller weld seams;

[0061] 6) The heat resistance temperature of the brazed joint does not decrease, and the brazing reaction layer will not remelt at lower temperatures.

[0062] In this embodiment, preferably, the powdered brazing filler metal filling the recess 21, the powdered brazing filler metal laid at the bottom of the positioning blind hole 12, and the powdered brazing filler metal filling between the layers of the brazing filler metal roll 2, together with the brazing filler metal roll 2, form an integral repair brazing filler metal. Furthermore, the arrangement of these powdered brazing filler metal positions helps to reduce brazing filler metal splashing caused by the heat deformation of the blade, thereby reducing the damage caused by brazing filler metal splashing.

[0063] The advantages of the rapid brazing repair method for non-penetrating cracks on the surface of a part provided in this embodiment are explained from various perspectives below:

[0064] 1) In this embodiment, the high-frequency induction heating of the brazing filler metal, compared with the traditional vacuum brazing, results in smaller equipment size during the repair process, making it more convenient to use. It also has lower heating energy consumption, lower requirements for the brazing environment, and allows for localized heating repairs without the need for overall blade heating, making it more adaptable.

[0065] 2) In this embodiment, the positioning blind hole 12 covers the crack 11 and the depth is not less than the depth of the crack 11. The positioning blind hole 12 can accommodate the molten brazing filler metal. Therefore, it can reduce the phenomenon of brazing filler metal turbulence and avoid insufficient brazing filler metal at the welding position. Since the brazing filler metal roll 2 is a sheet structure, it will not cause brazing filler metal splashing due to local heat deformation of the parts. In addition, with the help of the brazing filler metal roll 2, especially the brazing filler metal roll 2 made of amorphous thin strip brazing filler metal, the amount of brazing filler metal can be controlled more accurately, avoiding the phenomenon of brazing filler metal turbulence caused by excessive brazing filler metal layout, and finally ensuring the welding effect.

[0066] 3) The powder filler metal is arranged in the recess 21 of the filler metal roll 2 and in the gap between the layers of the filler metal roll 2, which can both increase the supply of filler metal and limit the powder filler metal by means of the recess 21 and the layers of the filler metal roll 2, so as to reduce the splashing phenomenon of the filler metal, and the powder filler metal in the positioning blind hole 12 is below the filler metal roll 2, which can also limit the powder filler metal, so as to also reduce the splashing phenomenon of the filler metal;

[0067] 4) The baffle or block of mica or quartz or sapphire material is arranged close to and higher than the filler metal roll 2, which can block the turbulent flow of the molten filler metal to the lower part of the curved surface or inclined surface, so as to ensure that the amount of filler metal required by the position to be welded on the curved surface or inclined surface is sufficient and the welding repair effect is ensured;

[0068] 5) The gap between the layers of the filler metal roll 2 can form a filler metal channel, so that the powder filler metal in the recess 21 and the gap between the layers of the filler metal roll 2 can naturally flow into the positioning blind hole 12 along the filler metal channel under the action of capillary force or its own gravity after being heated and melted, and the positioning blind hole 12 receives the melted powder filler metal, so as to reduce the turbulent flow of the melted filler metal out of the positioning blind hole 12, and the melted powder filler metal flowing into the positioning blind hole 12 from top to bottom can also push the melted powder filler metal in the positioning blind hole 12, promote the spread of the filler metal to all parts of the positioning blind hole 12, improve the compactness of the welding repair position, and further improve the welding repair quality;

[0069] 6) In the embodiment, during the heating process, a holding time of 5-10 min is set at a first temperature of 20-30°C lower than the melting temperature of the filler metal, so that the filler metal is in a sufficient pre-melted state, the pre-melted state of the filler metal is ensured and the turbulent flow phenomenon is avoided, and then the temperature is rapidly increased to a second temperature at which the filler metal is melted, and the temperature is held for 20-30 min at the second temperature, so that the welding time is shortened while ensuring that there is no turbulent flow.

[0070] Obviously, the above embodiments are only examples for the purpose of clarity, and are not limiting of the embodiments. Based on the above description, other different forms of changes or variations can be made by those of ordinary skill in the art. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A method for rapid brazing repair of non-penetrating cracks on the surface of a part, characterized in that, Includes the following steps: Remove the crack by forming a notch on the surface of the part corresponding to the location of the crack. A positioning blind hole is machined into the part at the notch, so that the positioning blind hole covers the notch, and the depth of the positioning blind hole is not less than the maximum depth of the notch; Roll the brazing filler metal according to the dimensions of the positioning blind hole; Insert the brazing filler metal roll into the positioning blind hole; The brazing filler metal coil is heated and melted to repair the cracks; When rolling the brazing filler metal into a coil according to the size of the positioning blind hole, one end of the brazing filler metal coil is recessed inward to form a recessed portion, and the other end is protruded outward to form a protruding portion. The protruding portion is adapted to face the inner bottom wall of the positioning blind hole. After the solder roll is inserted into the positioning blind hole, the top surface of the powder solder in the positioning blind hole is not higher than the top of the protrusion.

2. The method for rapid brazing repair of non-penetrating cracks on the surface of a part according to claim 1, characterized in that, The solder roll is made of amorphous thin strip solder.

3. The method for rapid brazing repair of non-penetrating cracks on the surface of a part according to claim 1, characterized in that, After inserting the solder roll into the positioning blind hole, fill the gaps between the layers of the solder roll with solder powder.

4. A method for rapid brazing repair of non-penetrating cracks on the surface of a part according to any one of claims 1-3, characterized in that... Before inserting the solder roll into the positioning blind hole, fill the positioning blind hole with powdered solder.

5. The method for rapid brazing repair of non-penetrating cracks on the surface of a part according to claim 4, characterized in that, After inserting the solder roll into the positioning blind hole, fill the recess with powdered solder.

6. A method for rapid brazing repair of non-penetrating cracks on the surface of a part according to any one of claims 1-3 or 5, characterized in that... After inserting the solder roll into the positioning blind hole, a baffle or block made of mica, quartz, or sapphire is fixed on the lower side of the surface of the part, so that the baffle or block is close to the solder roll and higher than the solder roll.

7. A method for rapid brazing repair of non-penetrating cracks on the surface of a part according to any one of claims 1-3 or 5, characterized in that... When heating and melting the brazing filler metal coil for crack welding, the filler metal is held at a first temperature 20°C-30°C below the melting temperature for 5-10 minutes, then heated to a second temperature that melts the filler metal, and held for 20-30 minutes.

8. A method for rapid brazing repair of non-penetrating cracks on the surface of a part according to any one of claims 1-3 or 5, characterized in that... When heating and melting the brazing filler metal coil for crack welding, high-frequency induction heating is used.

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