CN109226921B - Corrosion-resistant welding steel structure beneficial to solder circulation and manufacturing method thereof - Google Patents
Corrosion-resistant welding steel structure beneficial to solder circulation and manufacturing method thereof Download PDFInfo
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- CN109226921B CN109226921B CN201811378422.7A CN201811378422A CN109226921B CN 109226921 B CN109226921 B CN 109226921B CN 201811378422 A CN201811378422 A CN 201811378422A CN 109226921 B CN109226921 B CN 109226921B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
Abstract
The invention discloses a corrosion-resistant welding steel structure beneficial to the circulation of welding flux and a manufacturing method thereof, wherein the steel structure comprises a base body and a cylindrical pin shaft, wherein the base body is provided with a hole to be welded, 6-10 feed inlets are equidistantly arranged at the outer edge of the end surface corresponding to the opening of the hole to be welded before the cylindrical pin shaft is welded, 2-3 primary liquid separating channels are arranged at the lower part of each feed inlet according to a tree shape, 2-3 secondary liquid separating channels are also arranged at the bottom of each primary liquid separating channel, and an air hole which is directly communicated with the outer edge of the end surface corresponding to the opening of the hole to be welded is vertically arranged in the middle of the liquid separating channel at the; the liquid separating channels at the bottom are communicated with each other two by two. The steel structure of the invention has strong pertinence, full and compact liquid filling, good air tightness, few and discontinuous air holes, difficult welding and blocking and no oxidation of welding seams.
Description
Technical Field
The invention relates to the field of steel structures, in particular to a corrosion-resistant welding steel structure beneficial to solder circulation and a manufacturing method thereof.
Background
The steel structure is generally connected in three ways, namely welding connection, bolt connection and rivet connection. The welding connection has the advantages of direct connection to any direction, angle and shape of steel, no weakening of the section of a member, steel saving, simple structure, convenient manufacture, high connection rigidity, good sealing performance, suitability for automatic operation, high production efficiency and the like, and is widely applied. The welding connection is that the welding rod and the weldment are locally melted by the heat generated by the electric arc and are condensed into a welding seam through cooling, so that the weldments are connected into a whole. In the high-temperature welding and cooling process, a heat influence area is formed by steel near a welding line due to the high-temperature action, the structure is embrittled due to residual stress and residual deformation generated by uneven high temperature and cooling, and the bearing capacity, the rigidity and the service performance of the steel structure are influenced to a certain extent.
For a steel structure requiring corrosion resistance (such as being used in ocean and humid mould environments), the difference between the chemical components of a welding position material and a base material is large, galvanic cell effect formed by the difference of electrode potentials can accelerate corrosion, the acceleration is particularly easily reflected on welding defects, such as incomplete welding caused by uneven filling, and the like, so that the used brazing filler metal and welding filling quality are extremely important in the steel structure with corrosion resistance requirements, special limitation conditions determine that the base steel body is basically selected from stainless steel, and the brazing filler metal with high corrosion resistance and welding strength is selected from silver-based brazing filler metal, but the well-known silver-based brazing filler metal, particularly the silver-based brazing filler metal for steel welding, has poor wettability, even under the condition of flux-assisted welding, the minimum wetting gap required for welding is 0.02 mm-0.05 mm, and is limited by the precision of mechanical processing and the fact that a knife is generally adhered to the stainless steel, when deep-hole shaft hole fit welding occurs, the gap is difficult to control (particularly when the diameter difference is converted into a unilateral gap under tolerance), the condition that the partial area is too narrow and liquid filling is incomplete is easy to occur, and most importantly, once the condition occurs, the defect of incomplete welding which is always continuous is caused, and the defect is fatal to the strength, air tightness and corrosion resistance of a welding joint.
The welding residual stress is irregularly released when the welding point bears the gravity load, so that stress corrosion is easily caused, and the corrosion mainly occurs at the weak part of a welding structure. The strength and ductility of the welding joint are the main guarantee that the steel structure has good uniform corrosion resistance and mechanical strength, so that the selection of the proper steel structure and the welding process have very critical influence on the corrosion resistance and the mechanical strength of the steel structure during the welding of the steel structure.
However, in the related patents applied in China at present, the prior art which is specially used for welding the corrosion-resistant steel structure does not exist, so that a steel structure which is strong in pertinence, fully compact in filling liquid, good in air tightness, few and discontinuous in air holes, not easy to weld and block and free of oxidation of welding seams is needed in the market.
Disclosure of Invention
The invention aims to provide a steel structure with strong pertinence, full and compact filling liquid, good air tightness, few and discontinuous air holes, difficult welding and blocking and no oxidation of welding seams and a manufacturing method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for manufacturing a corrosion-resistant welded steel structure facilitating the circulation of solder comprises the following steps:
1) preparation before manufacture
Preparing raw materials: preparing a substrate provided with a hole to be welded, the tensile strength of the used material of which is not lower than 500MPa, a cylindrical pin shaft matched with the hole to be welded, the tensile strength of the used material of which is not lower than 500MPa and the surface of which is smooth, sufficient silver-based brazing filler metal, and sufficient prepared and uniformly stirred welding flux matched with the silver-based brazing filler metal;
preparing a tool: preparing a roller with a raised pattern on the surface, wherein the raised pattern is a groove carved on the cylindrical pin shaft and is characterized in that: 6 to 10 feed inlets with the length of 2.0 to 10.0mm, the width of 0.2 to 5.0mm, the depth of 0.01 to 0.012mm are equidistantly arranged at the outer edge of the end face corresponding to the opening of the hole to be welded on the base body, 2 to 3 primary liquid separating channels with the length of 2.0 to 10.0mm, the width of 0.2 to 3.0mm, the depth of 0.01 to 0.012mm are arranged at the lower part of each feed inlet according to a tree shape, 2 to 3 secondary liquid separating channels are also arranged at the bottom of each primary liquid separating channel, the middle part of the liquid separating channel at the bottommost part is vertically provided with air holes with the width of 0.01 to 0.012mm, the depth of 0.01 to 0.012mm, and the liquid separating channels at the bottommost part are communicated in pairs;
preparing equipment: preparing protective atmosphere welding equipment, a roller press and an oven;
2) preparation before welding
Rolling corresponding patterns on the surface of the cylindrical pin shaft prepared in the step 1) to obtain a cylindrical pin shaft to be welded by adopting a roller press prepared in the step three in the step 1) and taking the roller prepared in the step two in the step 1) as a rolling tool;
3) welding of
Firstly, the cylindrical pin shaft to be welded obtained in the stage 2) and the substrate provided with the hole to be welded prepared in the step 1) are coaxially matched and fixed according to the cylindrical pin shaft to be welded and the hole to be welded, and then the substrate is placed in protective atmosphere welding equipment prepared in the step 1) and the step three, the silver-based brazing filler metal prepared in the step 1) in the stage 1 is used as brazing filler metal, the welding flux prepared in the step 1) in the stage 1) is used as a welding auxiliary agent, and the silver-based brazing filler metal is adopted to weld corresponding to the temperature for welding, so that a welded steel structure is obtained;
4) post-treatment
Firstly, the welding steel structure obtained in the stage 3) is cooled to room temperature by water after welding is finished, then is placed at the temperature of minus 80 ℃ to minus 50 ℃ for cold treatment for 1h to 1.5h, and then is placed in an oven at the temperature of 180 ℃ to 230 ℃ for heat preservation for 2h to 3h, thus obtaining the corrosion-resistant welding steel structure which is beneficial to solder circulation.
In the manufacturing method of the corrosion-resistant welding steel structure beneficial to the circulation of the welding flux, the substrate and the cylindrical pin shaft are both made of austenitic stainless steel, and the silver-based brazing filler metal is BAg-3.
In the manufacturing method of the corrosion-resistant welding steel structure beneficial to the circulation of the welding flux, the substrate and the cylindrical pin shaft are both made of martensitic stainless steel, and the silver-based brazing filler metal is BAg-4.
In the manufacturing method of the corrosion-resistant welding steel structure beneficial to the circulation of the welding flux, when the depth of a hole to be welded in the matrix and the length L of the cylindrical pin shaft are not less than 30mm, a 3-level liquid separation channel to an n-level liquid separation channel are further arranged at the bottom of the secondary liquid separation channel, wherein n is a natural number, and the n and the L in millimeter unit follow a formula n > [ (L-30)/10] + 2.
In the manufacturing method of the corrosion-resistant welding steel structure beneficial to solder circulation, the raised patterns on the roller form acute-angle structures corresponding to the joints of all levels of liquid separating channels, the roller is directly adjusted by machining, and the acute-angle structures are all processed into smooth lead angles of R0.1mm-R2 mm.
The corrosion-resistant welding steel structure which is manufactured according to the method and is beneficial to the circulation of the welding flux comprises a base body provided with the hole to be welded and a cylindrical pin shaft matched with the hole to be welded, the steel structure is formed by welding and fixing a substrate and a cylindrical pin shaft by silver-based brazing filler metal, 6 to 10 feed inlets with the length of 2.0mm to 10.0mm, the width of 0.2mm to 5.0mm, the depth of 0.01mm to 0.012mm are equidistantly arranged at the outer edge of the end surface corresponding to the opening of a hole to be welded before the cylindrical pin shaft is welded, the lower part of each feed inlet is provided with 2 to 3 primary liquid separating channels with the length of 2.0mm to 10.0mm, the width of 0.2mm to 3.0mm and the depth of 0.01mm to 0.012mm according to a tree shape, the bottom of each primary liquid separating channel is also provided with 2 to 3 secondary liquid separating channels, and the middle part of the liquid separating channel at the bottommost part is vertically provided with an air hole with the width of 0.01mm to 0.012mm and the depth of 0.01mm to 0.012mm, wherein the air hole is at the outer edge of the end face corresponding to the opening of the hole to be welded and is a straight-through cylindrical pin shaft; the liquid separating channels at the bottom are communicated with each other two by two.
Compared with the prior art, the invention has the following advantages: 1) for steel structures which require corrosion resistance such as being used in ocean and damp mold environments), the prior art has limitations that either an integral forming process with high cost and low yield is selected, or a multi-layer composite coating is used for covering after welding. 2) The invention also aims at the requirement of corrosion resistance on welding airtightness, and through arranging the air holes which are directly communicated with the external environment at the bottom of the liquid separating channel, people always find that the air which is sealed in a welding seam and a welding hole has no place to escape except friction force and viscosity resistance in the welding process of the lower layer of the molten brazing filler metal is also a main problem after long-term production, the invention arranges the air holes at the bottom of the liquid separating channel, namely, the air escape channel is provided when the brazing filler metal sinks, and simultaneously, the bottom is full due to the fact that the brazing filler metal flows downwards from top to bottom after the bottom is filled with the brazing filler metal by utilizing the capillary effect and the fluid mechanics principle, so that the bottom is full, and the air holes are filled with the whole body due to the fact that the air escapes and the hole diameter of the air holes is far smaller than that of a liquid inlet, no brazing filler metal sinks through the air holes, or even a small amount of air holes are blocked, and a plurality of siphon air holes, finally, the technical purpose of no continuous air holes or welding leakage is realized. 3) The matching of the preferred, especially preferred steel grade and the brazing filler metal of the present invention is not realized in the prior art, and it is known from the prior art that although BAg-3 and BAg-4 are common silver-based brazing filler metals for steel welding, when applied to narrow-slit and tightly-fitted shaft hole welding, because of their general liquidity, they cannot simply and easily penetrate, and even if partially welded, because of insufficient compactness of the brazing filler metal, the welding strength is low. 4) Welding under protective atmosphere can ensure that a welding area is not oxidized, thereby avoiding the problems of internal oxidation and cavitation of a welding line caused by exposed zirconium welding in the prior art, meanwhile, subsequent rapid cooling and cold treatment also further promote the stability and complete transformation of the metallographic structure of the welding line, the final low-temperature heat treatment has the effect of removing stress on one hand, and on the other hand, can remove hydrogen caused by partial welding flux no matter water agent or welding flux prepared by ethanol, and the brittle substances such as hydrogen and the like are easily decomposed at high temperature, which is also an important reason for partial welding line embrittlement, and simultaneously can stabilize the metallographic structure (the austenitic stainless steel has little influence, but the rapid cooling of the martensitic stainless steel at the brazing temperature of 750 ℃ is equivalent to sub-temperature quenching again, and a very small amount of original tempered martensite is transformed into unstable quenched martensite after being solidified and is caused by stress release hidden trouble, the stress removing temperature of the invention is also the temperature of quenched martensite transformed into tempered martensite, the tempering treatment can be fully completed within the heat preservation time of 2-3 h). Therefore, the steel structure has the characteristics of strong pertinence, full and compact liquid filling, good air tightness, few and discontinuous air holes, difficult welding and blocking and no oxidation of welding seams.
Drawings
FIG. 1 is a top view of the present invention;
FIG. 2 is an expanded view of the side of a cylindrical pin shaft of the present invention;
fig. 3 is an expanded view of the side of a preferred cylindrical pin of the present invention.
In the figure: the device comprises a base body 1, a cylindrical pin shaft 2, a feeding hole 3, an air hole 4 and a liquid dividing channel 5.
Detailed Description
Example 1:
as shown in fig. 1 and fig. 2, the corrosion-resistant welding steel structure for facilitating the circulation of the welding flux comprises an austenitic stainless steel base body 1 provided with a hole to be welded and an austenitic stainless steel cylindrical pin shaft 2 matched with the hole to be welded, the steel structure is formed by welding and fixing a substrate 1 and a cylindrical pin shaft 2 by BAg-3, wherein 6 feed inlets 3 with the length of 8.0mm, the width of 0.2mm, the depth of 0.01 mm-0.012 mm are equidistantly arranged at the outer edge of the end surface corresponding to the opening of a hole to be welded before the welding of the cylindrical pin shaft 2, the lower part of each feed inlet 3 is provided with 2 primary liquid separation channels 5 with the length of 10.0mm, the width of 0.2mm, the depth of 0.01 mm-0.012 mm according to a tree shape, the bottom of each primary liquid separation channel 5 is also provided with 2 secondary liquid separation channels 5, and the middle part of the liquid separation channel 5 at the bottommost is vertically provided with an air hole 4 with the width of 0.01 mm-0.012 mm, the depth of 0.01 mm-0.012 mm and the end surface outer edge corresponding to the opening of the hole to be welded, of a straight-through cylindrical pin shaft 2; the bottommost liquid separating channels 5 are communicated with each other two by two.
The manufacturing method of the steel structure comprises the following steps:
1) preparation before manufacture
Preparing raw materials: preparing a substrate 1 which is made of austenitic stainless steel and is provided with a hole to be welded with the diameter of 12mm and the depth of 25mm, a cylindrical pin shaft 2 which is made of austenitic stainless steel and is smooth in surface and 25mm long, enough BAg-3, and enough welding flux which is matched with silver-based brazing filler metal, well prepared and uniformly stirred;
preparing a tool: preparing a roller with a raised pattern on the surface, wherein the raised pattern is specifically a groove carved on the cylindrical pin shaft 2: the outer edge of the end face corresponding to the opening of the hole to be welded on the cylindrical pin shaft 2 and the base body 1 is equidistantly provided with 6 feed inlets 3 with the length of 8.0mm, the width of 0.2mm, the depth of 0.01 mm-0.012 mm, the lower part of each feed inlet 3 is provided with 2 primary separating channels 5 with the length of 10.0mm, the width of 0.2mm, the depth of 0.01 mm-0.012 mm according to a tree shape, the bottom of each primary separating channel 5 is also provided with 2 secondary separating channels 5, the middle part of the lowermost separating channel 5 is vertically provided with air holes 4 with the width of 0.01 mm-0.012 mm, the depth of 0.01 mm-0.012 mm and the outer edge of the end face corresponding to the opening of the hole to be welded, the lowermost separating channel 5 is communicated in pairs;
preparing equipment: preparing protective atmosphere welding equipment, a roller press and an oven;
2) preparation before welding
Firstly, adopting a roller press prepared in the step 1) and the step III, taking the roller prepared in the step 1) and the step II as a rolling tool, and rolling corresponding patterns on the surface of the cylindrical pin shaft 2 prepared in the step 1) to obtain a cylindrical pin shaft 2 to be welded;
3) welding of
Firstly, the cylindrical pin shaft 2 to be welded obtained in the stage 2) and the substrate 1 provided with the hole to be welded prepared in the step 1) are coaxially matched and fixed, then the substrate is placed in protective atmosphere welding equipment prepared in the step 1) and the step c, BAg-3 prepared in the step 1) is used as brazing filler metal, welding flux prepared in the step 1) is used as a welding auxiliary agent, and BAg-3 is adopted to weld corresponding to the welding temperature to obtain a welded steel structure;
4) post-treatment
Firstly, the welding steel structure obtained in the stage 3) is cooled to room temperature by water after welding is finished, then is placed at the temperature of minus 80 ℃ to minus 70 ℃ for cold treatment for 1.5h, and then is placed in a baking oven at the temperature of 230 ℃ for heat preservation for 3h, thus obtaining the corrosion-resistant welding steel structure which is beneficial to solder circulation.
Example 2:
the whole is in accordance with example 1, with the difference that:
as shown in fig. 1 and fig. 3, the corrosion-resistant welding steel structure for facilitating the circulation of the welding flux comprises a martensitic stainless steel matrix 1 provided with holes to be welded and a martensitic stainless steel cylindrical pin shaft 2 matched with the holes to be welded, the steel structure is formed by welding and fixing a substrate 1 and a cylindrical pin shaft 2 by BAg-4, wherein 8 feed inlets 3 with the length of 2.0mm, the width of 5mm, the depth of 0.01 mm-0.012 mm are equidistantly arranged at the outer edge of the end surface corresponding to the opening of a hole to be welded before the welding of the cylindrical pin shaft 2, the lower part of each feed inlet 3 is provided with 3 primary liquid separating channels 5 with the length of 2mm, the width of 5mm and the depth of 0.01 mm-0.012 mm according to a tree shape, the bottom of each primary liquid separating channel 5 is also provided with 3 secondary liquid separating channels 5, and the middle part of the liquid separating channel 5 at the bottommost is vertically provided with an air hole 4 with the width of 0.01 mm-0.012 mm, the depth of 0.01 mm-0.012 mm and the end face outer edge corresponding to the opening of the hole to be welded, of the straight cylindrical pin shaft 2; the liquid separating channels 5 at the bottom are communicated with each other two by two; the joints of all levels of liquid separating channels are acute-angled structures, and are all processed into smooth guide angles of R0.1mm.
The manufacturing method of the steel structure comprises the following steps:
1) preparation before manufacture
Preparing raw materials: preparing a base body 1 which is made of martensitic stainless steel and is provided with a hole to be welded with the diameter of 30mm and the depth of 8mm, a cylindrical pin shaft 2 which is made of martensitic stainless steel and is smooth in surface and 8mm long, sufficient BAg-3, and sufficient prepared and uniformly stirred welding flux matched with silver-based brazing filler metal;
preparing a tool: preparing a roller with a raised pattern on the surface, wherein the raised pattern is specifically a groove carved on the cylindrical pin shaft 2: the cylindrical pin shaft 2 and the base body 1 are provided with 8 feed inlets 3 with the length of 2.0mm multiplied by the width of 5mm multiplied by the depth of 0.01 mm-0.012 mm at the outer edge of the end face corresponding to the opening of the hole to be welded at equal intervals, the lower part of each feed inlet 3 is provided with 3 primary liquid separating channels 5 with the length of 2mm multiplied by the width of 5mm multiplied by the depth of 0.01 mm-0.012 mm according to the tree shape, the bottom of each primary liquid separating channel 5 is also provided with 3 secondary liquid separating channels 5, the middle part of the liquid separating channel 5 at the bottommost is vertically provided with an air hole 4 with the width of 0.01 mm-0.012 mm multiplied by the depth of 0.01 mm-0.012 mm which is communicated with the outer edge of the end face corresponding to the opening of the hole to be welded at the cylindrical pin shaft 2, the liquid separating channels 5 at the bottommost are communicated with each other, the joint of the liquid;
3) welding of
Welding by taking BAg-4 prepared in the step I in the stage 1) as a brazing filler metal and taking a welding flux prepared in the step I in the stage 1) as a welding auxiliary agent at a temperature corresponding to the welding temperature of BAg-4 to obtain a welded steel structure;
4) post-treatment
Firstly, the welding steel structure obtained in the stage 3) is cooled to room temperature by water after welding is finished, then is placed at the temperature of minus 60 ℃ to minus 50 ℃ for cold treatment for 1 hour, and then is placed in an oven at the temperature of 180 ℃ for heat preservation for 2 hours, thus obtaining the corrosion-resistant welding steel structure which is beneficial to solder circulation.
Example 3:
the whole is in accordance with example 1, with the difference that:
a corrosion-resistant welding steel structure beneficial to the circulation of welding flux comprises a martensitic stainless steel matrix 1 provided with holes to be welded and a martensitic stainless steel columnar pin shaft 2 matched with the holes to be welded, the steel structure is formed by welding and fixing a substrate 1 and a cylindrical pin shaft 2 by BAg-4, wherein 8 feed inlets 3 with the length of 10.0mm, the width of 3mm, the depth of 0.01 mm-0.012 mm are equidistantly arranged at the outer edge of the end surface corresponding to the opening of a hole to be welded before the welding of the cylindrical pin shaft 2, the lower part of each feed inlet 3 is provided with 3 primary liquid separating channels 5 with the length of 10mm, the width of 3mm and the depth of 0.01 mm-0.012 mm according to a tree shape, the bottom of each primary liquid separating channel 5 is also provided with 3 secondary liquid separating channels 5, the bottom of each secondary liquid separating channel 5 is also provided with 3 tertiary liquid separating channels 5, and the middle part of the liquid separating channel 5 at the bottommost is vertically provided with an air hole 4 with the width of 0.01 mm-0.012 mm and the depth of 0.01 mm-0.012 mm at the outer edge of the end face corresponding to the opening of the hole to be welded by a straight-through cylindrical pin shaft 2; the liquid separating channels 5 at the bottom are communicated with each other two by two; the joints of all the liquid separating channels are acute angles, and are all processed into smooth guide angles of R2 mm.
The manufacturing method of the steel structure comprises the following steps:
1) preparation before manufacture
Preparing raw materials: preparing a base body 1 which is made of martensitic stainless steel and is provided with a hole to be welded with the diameter of 30mm and the depth of 38mm, a cylindrical pin shaft 2 which is made of martensitic stainless steel and is smooth in surface and 38mm long, sufficient BAg-3, and sufficient prepared and uniformly stirred welding flux matched with silver-based brazing filler metal;
preparing a tool: preparing a roller with a raised pattern on the surface, wherein the raised pattern is specifically a groove carved on the cylindrical pin shaft 2: the cylindrical pin shaft 2 and the outer edge of the end face corresponding to the opening of the hole to be welded on the base body 1 are equidistantly provided with 8 feed inlets 3 with the length of 10.0mm multiplied by the width of 3mm multiplied by the depth of 0.01 mm-0.012 mm, the lower part of each feed inlet 3 is provided with 3 primary liquid separating channels 5 with the length of 10mm multiplied by the width of 3mm multiplied by the depth of 0.01 mm-0.012 mm according to a tree shape, the bottom of each primary liquid separating channel 5 is also provided with 3 secondary liquid separating channels 5, the middle part of each secondary liquid separating channel 5 at the bottom is vertically provided with a straight-through cylindrical pin shaft 2 and an air hole 4 with the width of 0.01 mm-0.012 mm multiplied by the depth of 0.01 mm-0.012 mm, the liquid separating channels 5 at the bottom are communicated, the joint of each secondary liquid separating channel is in an acute angle structure, and the smooth guide angle for R2mm is processed;
3) welding of
Welding by taking BAg-4 prepared in the step I in the stage 1) as a brazing filler metal and taking a welding flux prepared in the step I in the stage 1) as a welding auxiliary agent at a temperature corresponding to the welding temperature of BAg-4 to obtain a welded steel structure;
4) post-treatment
Firstly, the welding steel structure obtained in the stage 3) is cooled to room temperature by water after welding is finished, then is placed at the temperature of minus 70 ℃ to minus 60 ℃ for cold treatment for 1.5h, and then is placed in a drying oven at the temperature of 200 ℃ for heat preservation for 2.5h, thus obtaining the corrosion-resistant welding steel structure which is beneficial to solder circulation.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A method for manufacturing a corrosion-resistant welded steel structure facilitating the circulation of solder is characterized by comprising the following steps:
1) preparation before manufacture
Preparing raw materials: preparing a base body (1) which is provided with a hole to be welded and has the tensile strength of not less than 500MPa of a used material, a cylindrical pin shaft (2) which is matched with the hole to be welded and has the tensile strength of not less than 500MPa of the used material and a smooth surface, sufficient silver-based solder and sufficient welding flux which is matched with the silver-based solder and is well prepared and uniformly stirred;
preparing a tool: preparing a roller with a raised pattern on the surface, wherein the raised pattern is formed by specifically carving grooves on a cylindrical pin shaft (2) as follows: the outer edge of the end face corresponding to the opening of the hole to be welded on the cylindrical pin shaft (2) and the base body (1) is equidistantly provided with 6 to 10 feed inlets (3) with the length of 2.0mm to 10.0mm, the width of 0.2mm to 5.0mm, the depth of 0.01mm to 0.012mm, the lower part of each feed inlet (3) is provided with 2 to 3 primary liquid separating channels (5) with the length of 2.0mm to 10.0mm, the width of 0.2mm to 3.0mm, the depth of 0.01mm to 0.012mm according to a tree shape, the bottom of each primary liquid separating channel (5) is also provided with 2 to 3 secondary liquid separating channels (5), the middle part of the liquid separating channel (5) at the bottommost is vertically provided with a straight-through cylindrical pin shaft (2) and a first-level liquid separating channel (4) with the width of 0.01mm to 0.012mm, the depth of 0.01mm to 0.012mm, the end face corresponding to the opening of the hole to be welded, and every two liquid separating channels (5;
preparing equipment: preparing protective atmosphere welding equipment, a roller press and an oven;
2) preparation before welding
Firstly, adopting a roller press prepared in the step 1) and the step III, taking the roller prepared in the step 1) and the step II as a rolling tool, and rolling corresponding patterns on the surface of the cylindrical pin shaft (2) prepared in the step 1) to obtain the cylindrical pin shaft (2) to be welded;
3) welding of
The method comprises the steps of firstly, fixing a cylindrical pin shaft (2) to be welded obtained in the step 2) and a substrate (1) provided with holes to be welded, which is prepared in the step 1), in a coaxial matching manner according to the cylindrical pin shaft (2) to be welded and the holes to be welded, placing the substrate in protective atmosphere welding equipment prepared in the step 1), and welding the substrate in a welding manner by using silver-based brazing filler metal prepared in the step 1) as brazing filler metal and using welding flux prepared in the step 1) as welding auxiliary agent and adopting the silver-based brazing filler metal to correspond to the temperature for welding to obtain a welded steel structure;
4) post-treatment
Firstly, the welding steel structure obtained in the stage 3) is cooled to room temperature by water after welding is finished, then is placed at the temperature of minus 80 ℃ to minus 50 ℃ for cold treatment for 1h to 1.5h, and then is placed in an oven at the temperature of 180 ℃ to 230 ℃ for heat preservation for 2h to 3h, thus obtaining the corrosion-resistant welding steel structure which is beneficial to solder circulation.
2. The method of manufacturing a corrosion-resistant welded steel structure facilitating solder flow of claim 1, wherein: the matrix (1) and the cylindrical pin shaft (2) are both made of austenitic stainless steel, and the silver-based brazing filler metal is BAg-3.
3. The method of manufacturing a corrosion-resistant welded steel structure facilitating solder flow of claim 1, wherein: the substrate (1) and the cylindrical pin shaft (2) are both made of martensitic stainless steel, and the silver-based brazing filler metal is BAg-4.
4. The method of manufacturing a corrosion-resistant welded steel structure facilitating solder flow of claim 1, wherein: when the depth of a hole to be welded in the base body (1) and the length L of the cylindrical pin shaft (2) are not less than 30mm, a 3-stage liquid channel (5) -n-stage liquid channel (5) is further arranged at the bottom of the second-stage liquid channel (5), n is a natural number, wherein n and L in millimeter unit follow the formula n > [ (L-30)/10] + 2.
5. The method of manufacturing a corrosion-resistant welded steel structure facilitating solder flow of claim 1, wherein: the raised patterns on the roller form acute-angle structures corresponding to the joints of the liquid separation channels (5), the acute-angle structures are all machined and adjusted on the roller directly, and the acute-angle structures are machined into smooth guide angles of R0.1mm-R2 mm.
6. A corrosion-resistant welding steel structure beneficial to the circulation of solder manufactured by the method of claim 1, which comprises a base body (1) provided with holes to be welded and a cylindrical pin shaft (2) matched with the holes to be welded, wherein the steel structure is formed by welding the base body (1) and the cylindrical pin shaft (2) by silver-based solder and then fixing the base body and the cylindrical pin shaft, and is characterized in that: the outer edge of the end face corresponding to the opening of the hole to be welded is equidistantly provided with 6 to 10 feed inlets (3) with the length of 2.0mm to 10.0mm, the width of 0.2mm to 5.0mm and the depth of 0.01mm to 0.012mm before the cylindrical pin shaft (2) is welded, the lower part of each feed inlet (3) is provided with 2 to 3 primary liquid separating channels (5) with the length of 2.0mm to 10.0mm, the width of 0.2mm to 3.0mm, the depth of 0.01mm to 0.012mm according to a tree shape, the bottom of each primary liquid separating channel (5) is also provided with 2 to 3 secondary liquid separating channels (5), and the middle part of the liquid separating channel (5) at the bottommost part is vertically provided with an air hole (4) with the width of 0.01mm to 0.012mm, the depth of 0.01mm to 0.012mm at the outer edge of the end face corresponding to the opening of the cylindrical pin shaft (2) and the; the bottommost liquid separating channels (5) are communicated with each other in pairs.
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| CN101376187A (en) * | 2007-08-31 | 2009-03-04 | 王培红 | Method for increasing solder fluidity in furnace welding |
| CN102706205A (en) * | 2011-03-28 | 2012-10-03 | 株式会社丰田自动织机 | Heat exchanger and method of joining heat exchanger pipe |
| JP2012523322A (en) * | 2009-04-09 | 2012-10-04 | アーベーベー・テヒノロギー・アーゲー | Soldering preform |
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| CN209223338U (en) * | 2018-11-19 | 2019-08-09 | 广西天正钢结构有限公司 | Conducive to the welded steel structure of solder circulation |
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|---|---|---|---|---|
| CN101376187A (en) * | 2007-08-31 | 2009-03-04 | 王培红 | Method for increasing solder fluidity in furnace welding |
| JP2012523322A (en) * | 2009-04-09 | 2012-10-04 | アーベーベー・テヒノロギー・アーゲー | Soldering preform |
| CN102706205A (en) * | 2011-03-28 | 2012-10-03 | 株式会社丰田自动织机 | Heat exchanger and method of joining heat exchanger pipe |
| CN106944697A (en) * | 2017-05-22 | 2017-07-14 | 上海克林技术开发有限公司 | A kind of welding method of four wings octagon radio frequency four polar field accelerator cavity |
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