CN110666279A - Brazing method for aluminum bronze pipe joint - Google Patents

Brazing method for aluminum bronze pipe joint Download PDF

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Publication number
CN110666279A
CN110666279A CN201910976229.1A CN201910976229A CN110666279A CN 110666279 A CN110666279 A CN 110666279A CN 201910976229 A CN201910976229 A CN 201910976229A CN 110666279 A CN110666279 A CN 110666279A
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Prior art keywords
brazing
aluminum bronze
joint
copper plating
cyanide
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CN201910976229.1A
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白树学
李峥
任金山
李安宏
郭敏
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National No616 Plant
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National No616 Plant
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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
    • 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
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—Tubes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

The invention discloses an aluminum bronze pipe joint brazing method, which comprises the following steps: s1: carrying out size measurement recording on a plurality of positions on the aluminum bronze joint to be welded, and marking the measurement positions; s2: carrying out oil removal and cleaning treatment on an aluminum bronze joint to be welded; s3: carrying out cyanide copper plating treatment on the cleaned aluminum bronze joint; s4: and measuring the size of the marked part on the aluminum bronze joint subjected to the copper plating treatment again, and assembling and brazing the part and the brass pipe when the size meets the preset requirement. The invention improves the process method, can braze the aluminum bronze joint surface by adopting the conventional brazing filler metal and brazing flux after special modification treatment on the premise of not influencing the service performance of the joint, has no special requirements on the brazing filler metal and the brazing flux, solves the problem that the special brazing flux causes corrosive influence on workpieces and series of complicated anti-corrosion washing measures, and improves the brazing operability.

Description

Brazing method for aluminum bronze pipe joint
Technical Field
The invention belongs to the technical field of brazing, and relates to a brazing method for an aluminum bronze pipe joint.
Background
The arrangement of pipeline parts on the diesel engine for the high-power ship is complex, the quantity and the specification are large, the normal operation of the engine can be influenced by air leakage, oil leakage or water leakage, the performance of the engine is rapidly reduced, even the accidents such as power cabin ignition and the like are caused when the engine is serious, and the maintenance space arrangement of the whole engine in the power cabin is relatively limited. Therefore, it is very important to improve the reliability and durability of the piping parts in one installation. In order to overcome the corrosive influence of seawater and acid-base environment, copper pipes and stainless steel pipe materials are mostly adopted in the design of high-power diesel engine pipeline parts for ships (particularly air pipe parts and seawater pipe parts), so as to reduce the corrosion sound of acid mist environment, and pipeline joints (such as sealing cones, rotary pipe joints, nuts and the like) connected with the pipeline parts are basically made of aluminum bronze materials, so that the aluminum bronze materials are preferably selected due to excellent corrosion resistance, acid-base resistance and excellent machining performance.
At present, more than 90% of the connection between the pipe and the pipeline joint on the diesel engine for the high-power ship is completed by a brazing mode. Because the aluminum bronze material contains aluminum element cables with certain components, an AL2O3 film can be formed on the surface of the aluminum bronze joint and cannot be removed in the brazing process, the liquid brazing filler metal and the base metal cannot be well fused and cannot be wetted and spread on the surface of the aluminum bronze, so that great difficulty is caused to the brazing process, and the difficulty in the brazing industry is caused. In China, a part of enterprises use a high-activity brazing flux with stronger corrosivity to assist in completing the brazing of aluminum bronze steel joints. However, the formula of the special brazing flux and the effect after welding are different, no complete standard exists in China, and the formula of the special brazing flux is not disclosed abroad.
The special brazing flux with extremely high corrosivity is used, and the workpiece needs to be strictly brushed in time after being welded so as to prevent brazing flux residues from causing corrosion influence on the workpiece, so that the requirement on the workpiece after being welded is extremely high. The influence degree of the special brazing flux on the workpiece is not easy to control, the efficiency is low, and the welding quality can not be ensured. In the actual brazing process, because the formula effect is not in the best state, the problems of poor fiber weldability between pipes or pipe joints, infirm brazing, small spreading area of brazing filler metal, poor brazing gap filling capacity and the like are often caused, even the pipes or the pipe joints are fused or penetrated by burning, the brazing quality has hidden dangers of different degrees, and the one-time brazing qualification rate is less than 50%. After the automobile is loaded and used, the faults of cracking and oil leakage of the pipe, vibration and pull-out of the joint and the like are shown, and great inconvenience is caused to the use and the maintenance. Meanwhile, the brazing flux is more in powder products in the market, and the preparation, the storage and the quality guarantee period of the brazing flux are inconvenient due to the strong heat absorption property of the brazing flux.
Disclosure of Invention
Objects of the invention
The purpose of the invention is: the method for brazing the aluminum bronze pipe joint has the characteristics of no special requirements on brazing filler metal and brazing flux, strong brazing operability, good economy and high brazing quality.
(II) technical scheme
In order to solve the technical problem, the invention provides an aluminum bronze pipe joint brazing method, which comprises the following steps:
s1: carrying out size measurement recording on a plurality of positions on the aluminum bronze joint to be welded, and marking the measurement positions;
s2: carrying out oil removal and cleaning treatment on an aluminum bronze joint to be welded;
s3: carrying out cyanide copper plating treatment on the cleaned aluminum bronze joint;
s4: and measuring the size of the marked part on the aluminum bronze joint subjected to the copper plating treatment again, and assembling and brazing the part and the brass pipe when the size meets the preset requirement.
Wherein, in step S2, the deoiling adopts the thermal electrolysis deoiling solution, and the component of thermal electrolysis deoiling solution includes: 40-60 g/L of sodium hydroxide; 20-40 g/L of sodium carbonate; 15-30 g/L trisodium phosphate; 3-5 g/L of water glass.
Wherein, in the step S2, the temperature is 70-80 ℃ and the current density is 2-5A/dm during oil removal2The time is 30 to 40min。
In step S2, a weak acid washing solution is used during the washing process, and the weak acid washing solution contains: 50-80 g/L of sulfuric acid; 50-80 g/L of hydrochloric acid; 10-20 g/L of nitric acid; 3-5 g/L of hydrofluoric acid.
In step S2, the cleaning time is 60-150S.
In step S3, when the cyanide copper plating bath is used for the plating process, the plating solution includes: 40-70 g/L of cuprous cyanide; the total amount of sodium cyanide is 60-90 g/L; 10-25 g/L of free sodium cyanide; 20-30 g/L of potassium sodium tartrate.
Wherein, in the step S3, when the cyanide copper plating bath plating treatment is carried out, the solution temperature is 50-60 ℃, and the cathode current density is 3-5A/dm2。
In the step S3, in the cyanide copper plating bath plating process, an impact current is applied for 1-2 min, and the current intensity is 1-1.5 times of the normal copper plating current.
In the step S3, the cyanide copper plating time is 13-18 min, and the plating thickness is 0.008-0.011 mm.
In step S4, solder BAg40CuZnCdNi and flux QJ 101-0J 103 are used during soldering.
(III) advantageous effects
According to the brazing method for the aluminum bronze pipe joint, the process method is improved, on the premise that the use performance of the joint is not affected, the surface of the joint in the aluminum bronze brazing area is subjected to special modification treatment, conventional brazing filler metal and brazing flux can be used for brazing, no special requirement is required for the brazing filler metal and the brazing flux, the problem that the special brazing flux affects workpieces in a corrosive manner and a series of complicated anti-corrosion washing measures are eliminated, the brazing operability is improved, compared with the pipe joint of which the surface is not subjected to special treatment, the tensile strength, the brazing filler metal spreadability, the brazing seam filling capacity, the appearance quality of a welding seam and the like are greatly improved, and the brazing quality and the batch production efficiency are also obviously improved.
Drawings
FIG. 1 is an illustration of an aluminum bronze joint (QAL 10-4).
Figure 2 is a schematic view of the pipe and fitting assembly.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The brazing method of the aluminum bronze pipe joint comprises the following steps:
preparing a test piece: the high-power ship is provided with a brass (H62) pipe and an aluminum bronze joint (QAL10-4) which are widely applied as test workpieces. The specification of the brass (H62) tube is phi 12mm multiplied by 1mm, and the length is 150 mm; the specification of the aluminum bronze joint (QAL10-4) used is shown in FIG. 1. Quantity: 6 brass tubes and 12 aluminum bronze joints.
(II) preparing a test tool: in consideration of the heating uniformity and stability of the welding test, an induction brazing machine is selected for induction brazing, and commonly used brazing fluxes QJ 101-QJ 103 are selected.
(III) test method
1. 6 of the prepared 12 aluminum bronze joints are separated for surface modification treatment, and meanwhile, a micrometer is adopted to measure and record the dimensions of a plurality of positions of 3 random parts, and the measured positions are marked.
2. The modification treatment adopts a cyanide copper plating process, the parameters are optimized, and then the groove plating is carried out, the copper plating time is controlled to be 13-18 min, the plating thickness is controlled to be 0.008-0.011 mm, and the binding force of the part plating is ensured. The surface of the plating layer does not have bubbles, coating peeling, pockmarks, roughness and the like, and the optimization control conditions of main parameters are as follows:
(1) in order to ensure good copper plating effect, the plated part is degreased firstly, and in order to ensure better degreasing quality, the components and the working specification of the thermal electrolytic degreasing solution are optimized (table 1):
TABLE 1
Figure BDA0002233734380000041
(2) In order to ensure the binding force of a part copper layer, a plated part is cleaned after oil removal, and the components and the working specification of a weak acid cleaning solution for cleaning are optimized (table 2):
TABLE 2
Figure BDA0002233734380000051
(3) The composition of the copper plating solution and the working specifications were optimized for precise control of the copper layer thickness without blistering, copper layer peeling, pitting or roughening, etc. (Table 3)
TABLE 3
Figure BDA0002233734380000052
3. The adhesion strength of the plating layer is subjected to scribing and lattice test inspection according to the requirements of GB5270 test methods for metal matrix coating and adhesion strength, and the next operation is carried out after the adhesion strength is qualified.
4. And (4) checking the thickness of the plating layer: and according to the marking condition of the position before plating, measuring and recording the joint after plating at the same position. And comparing the data before and after measurement, measuring and calculating the thickness, and performing the next operation after the thickness is qualified. The optimal plating layer thickness parameter range value for the aluminum bronze joint meeting the brazing performance requirement is 0.008-0.011 mm.
5. The prepared joints are divided into two groups, one group with a coating and one group without a coating.
All the pipes and joints are cleaned by organic solvent, and then assembled and brazed according to the requirements of figure 2, and the pipes and the joints are classified according to the plating and non-plating of the joints. The two groups of test pieces are brazed by adopting common solder (BAg40CuZnCdNi) and flux QJ 101-0J 103.
6. Recording the whole welding process, including the fusion condition of the brazing filler metal when the test piece is heated, the experience of operators in welding, the state of brazing flux remaining on the surface of the test piece, the smoothness and uniform continuity of the surface of a welding seam and the like.
7. And (3) performing a ray inspection test on the two groups of butt-welded tests, observing the filling fullness in the gap, performing a strength tensile test on a tensile tester CNT5305, and recording the test process and results.
(IV) test results and general analysis description (Table 4)
TABLE 4
Figure BDA0002233734380000061
According to the technical scheme, on the premise that the service performance of the joint is not influenced, the aluminum bronze joint can be brazed only by adopting the conventional brazing filler metal and the brazing flux after the special modification treatment is carried out on the surface of the aluminum bronze material, the tensile strength after brazing, the spreading capacity of the brazing filler metal, the brazing seam filling capacity, the appearance shape of a welding seam and the like are all stronger than those of the joint which is not subjected to the special treatment, and the brazing quality and the batch efficiency are obviously improved. Through comprehensive analysis of various records of test pieces in different states, the brazing operation is carried out after the surface of the aluminum bronze joint is plated with copper, the appearance quality, gap filling capacity, weld strength and fusion property with a base material after brazing are all superior to those of the aluminum bronze joint which is not plated with copper, and the brazing operability is stronger besides no special requirements on brazing filler metal and brazing flux. Through experimental verification of the technology, a new more economical and efficient brazing method is developed and summarized in the brazing field, and solid and reliable technical support is provided for the pipe fitting brazing technology of various engines. The technology obtained by the invention is successfully applied to the brazing of the aluminum bronze joint on the diesel engine of a certain type of high-power ship, has good application effect and has remarkable military benefits.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (10)

1. The brazing method of the aluminum bronze pipe joint is characterized by comprising the following steps of:
s1: carrying out size measurement recording on a plurality of positions on the aluminum bronze joint to be welded, and marking the measurement positions;
s2: carrying out oil removal and cleaning treatment on an aluminum bronze joint to be welded;
s3: carrying out cyanide copper plating treatment on the cleaned aluminum bronze joint;
s4: and measuring the size of the marked part on the aluminum bronze joint subjected to the copper plating treatment again, and assembling and brazing the part and the brass pipe when the size meets the preset requirement.
2. The method for brazing an aluminum bronze pipe joint according to claim 1, wherein in step S2, the degreasing agent is a thermal electrolytic degreasing solution, and the thermal electrolytic degreasing solution comprises: 40-60 g/L of sodium hydroxide; 20-40 g/L of sodium carbonate; 15-30 g/L trisodium phosphate; 3-5 g/L of water glass.
3. The method for brazing the joint of the aluminum bronze pipe according to claim 2, wherein in the step S2, the temperature is 70 to 80 ℃ and the current density is 2 to 5A/dm2The time is 30-40 min.
4. The method for brazing the joint of the aluminum bronze pipe as recited in claim 3, wherein in the step S2, a weak acid washing solution is used during the cleaning process, and the weak acid washing solution comprises: 50-80 g/L of sulfuric acid; 50-80 g/L of hydrochloric acid; 10-20 g/L of nitric acid; 3-5 g/L of hydrofluoric acid.
5. The method for brazing an aluminum bronze pipe joint according to claim 4, wherein the cleaning treatment time in step S2 is 60 to 150 seconds.
6. The method of brazing an aluminum bronze pipe joint according to claim 5, wherein in the step S3, when the cyanide copper plating bath plating is performed, the plating bath includes: 40-70 g/L of cuprous cyanide; the total amount of sodium cyanide is 60-90 g/L; 10-25 g/L of free sodium cyanide; 20-30 g/L of potassium sodium tartrate.
7. The aluminum bronze pipe joint according to claim 6The head brazing method is characterized in that in the step S3, when the cyanide copper plating bath plating treatment is carried out, the solution temperature is 50-60 ℃, and the cathode current density is 3-5A/dm2。
8. The method for brazing the joint of the aluminum bronze pipe according to claim 7, wherein in the step S3, in the plating process of the cyanide copper plating bath, an impact current is applied for 1-2 min, and the current intensity is 1-1.5 times of the normal copper plating current.
9. The method for brazing an aluminum bronze pipe joint according to claim 8, wherein in step S3, the time for cyaniding copper plating is 13 to 18min, and the plating thickness is 0.008 to 0.011 mm.
10. The method of brazing an aluminum bronze pipe joint according to claim 9, wherein in step S4, the brazing material BAg40CuZnCdNi and flux QJ101 to 0J103 are used.
CN201910976229.1A 2019-10-15 2019-10-15 Brazing method for aluminum bronze pipe joint Pending CN110666279A (en)

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CN103952735A (en) * 2014-05-11 2014-07-30 山东建筑大学 Steel band continuous copper plating V
CN104368818A (en) * 2014-10-24 2015-02-25 苏州莱特复合材料有限公司 Iron-based powder metallurgical material electroplating technology
CN108326384A (en) * 2017-12-11 2018-07-27 安徽宝辰机电设备科技有限公司 A kind of soldering processes of high-strength corrosion-resistant erosion joint of aluminium and copper
CN109773296A (en) * 2017-11-11 2019-05-21 天津二建水电安装工程有限公司 Copper pipe seamless welding technique

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Publication number Priority date Publication date Assignee Title
CN101537520A (en) * 2009-04-30 2009-09-23 顺特电气有限公司 Brazing method of aluminum electromagnetic wire and brass
CN103952735A (en) * 2014-05-11 2014-07-30 山东建筑大学 Steel band continuous copper plating V
CN104368818A (en) * 2014-10-24 2015-02-25 苏州莱特复合材料有限公司 Iron-based powder metallurgical material electroplating technology
CN109773296A (en) * 2017-11-11 2019-05-21 天津二建水电安装工程有限公司 Copper pipe seamless welding technique
CN108326384A (en) * 2017-12-11 2018-07-27 安徽宝辰机电设备科技有限公司 A kind of soldering processes of high-strength corrosion-resistant erosion joint of aluminium and copper

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Application publication date: 20200110