CN111299895A - Welding structure and process for reducing residual stress of seam sealing welding - Google Patents
Welding structure and process for reducing residual stress of seam sealing welding Download PDFInfo
- Publication number
- CN111299895A CN111299895A CN201911251925.2A CN201911251925A CN111299895A CN 111299895 A CN111299895 A CN 111299895A CN 201911251925 A CN201911251925 A CN 201911251925A CN 111299895 A CN111299895 A CN 111299895A
- Authority
- CN
- China
- Prior art keywords
- welding
- sealing
- residual stress
- guide groove
- seam
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
Abstract
The invention aims at the improvement of a welding structure that two metal parts are sealed in a plane contact mode under the action of a pre-tightening force, and the end parts of the two parts are sealed in a welding mode. The invention is characterized in that: (1) the contact planes of the two components realize sealing under the action of a pre-tightening force; (2) the ends of the two planes are sealed by welding. The present invention is applicable to all of the above-described structural modifications, such as valve seal lip welding, etc.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a sealing lip welding structure and a sealing lip welding process.
Background
Taking a valve seal lip weld as an example, such a valve seal lip weld leak is a multiple event, and the seal structure thereof is shown in fig. 1.
Analyzed, the mechanism of leak generation: the upper and lower valve bodies form a rigid fixed body after being applied with pretightening force, and the welding performed at the end part of the rigid fixed body with the gap causes larger residual stress formed at the root part of the welding seam (at C in figure 1) to cause cracks.
Disclosure of Invention
The invention aims to solve the technical problem of providing a welding structure for greatly reducing the residual stress of seam sealing welding, which is applicable to the welding of a plane sealing end part with pretightening force. The invention comprehensively reduces the welding residual stress of the structure by improving the shape of the end welding structure, improving the type of the filler metal and improving the welding process and parameters.
The technical scheme of the invention is as follows:
the utility model provides a reduce welded structure of seam sealing welding residual stress, includes that relative setting treats welded part upper part of the body and the part lower part of the body, its characterized in that:
the sealing surface that the relative setting of part upper part of the body and part lower part of the body is provided with upper groove and low groove respectively, upper groove and low groove form sealed guide slot, sealed guide slot intussuseption is filled with the metal strip, the metal strip with part upper part of the body, part lower part of the body pass through welded connection.
Furthermore, the cross section of the sealing guide groove is square, and the inner chamfer of the sealing guide groove is an arc chamfer.
Further, the cross section of the sealing guide groove is semicircular.
Further, the cross section of the sealing guide groove is oval.
Further, the section of the metal strip is square, semicircular or a polygon.
A welding process for reducing residual stress of seam sealing welding is characterized by comprising the following steps:
(1) processing a sealing guide groove between the sealing surfaces of the upper body and the lower body of the component to be welded;
(2) selecting a reasonable filling metal material, processing the filling metal to enable the shape and the size of the cross section of the filling metal material and the fit clearance of the sealing guide groove to meet the technical requirements of a welding process, and placing a metal strip into the sealing guide groove;
(3) and welding and connecting the metal strip with the upper part of the component and the lower part of the component.
By the scheme, the invention at least has the following advantages:
(1) the movable filling metal is adopted to replace a structure with larger constraint degree of a welding line at the root part in the prior art, so that the welding at most part of rigid constraint degree in the prior art is changed into the welding at non-rigid constraint part, thereby playing the role of greatly reducing the residual stress of welding;
(2) different from the welding self-melting sealing mode adopted by the prior art, the invention can adopt filler metal with better plastic toughness, thereby ensuring that the plastic toughness of the weld metal is reduced by the weld metal in the prior art so as to reduce the risks of generating cracks and crack propagation;
(3) a welding seam with certain fusion depth is obtained by adopting a reasonable welding process and welding parameters, so that the sealing effect is better than that of the sealing in the prior art;
(4) each time such component repairs are performed, the prior art requires cutting the D-site in fig. 1 resulting in a reduction in dimension D1 in fig. 1, which results in component scrap when D1 is less than specification. The invention only needs to cut F in figure 4, so that the dimension D5 in figure 4 is not reduced in the process of maintenance, thereby greatly prolonging the service life of the components.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic cross-sectional view of a prior art sealing weld;
FIG. 2 is a schematic cross-sectional view of a seal face end seal channel of the present invention;
FIG. 3 is a schematic cross-sectional view of the filler metal of the present invention installed in a sealed channel;
FIG. 4 is a schematic cross-sectional view of a welded structure according to the present invention;
wherein: A. a component upper body; B. a component lower body; C. the prior art seals the seam at the root of the weld; D. sealing the weld seam in the prior art; E. the invention seals the root of the guide groove; F. the invention fills metal; G. the invention seals the weld; d1, the size of the combining surface of the upper and lower bodies in the prior art is reduced along with successive overhaul; d2, the depth of the sealing guide groove of the invention; d3, the width of the sealing guide groove of the invention; d4, the sealing guide groove prevents the stress concentration arc; d5, the size of the joint surface of the upper body and the lower body cannot be reduced along with maintenance; d6, filler metal cross-sectional dimensions of the invention; d7, the sealing weld penetration of the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
A welding structure for reducing residual stress of seam sealing welding has the following principle: and (3) processing a sealing guide groove at the end part of the contact plane of the upper and lower components and filling metal in the sealing guide groove, so that the welding structure of the original sealing root (shown as the part C in figure 1) is converted into a non-welding structure (shown as the part E in figure 2), and the structural rigidity constraint degree of the sealing weld root is reduced.
The filling material with better plasticity and toughness can be selected to improve the plasticity and toughness of the weld metal. Reasonable welding process and parameters are selected to ensure a certain weld penetration. Because the improved welding structure is formed by base metal and filling metal, the restraint degree of the welding line is greatly reduced, and the sealing effect is ensured on the basis of sealing the welding line with a certain fusion depth.
The end part is provided with a sealing guide groove which can reduce the restraint degree of the welding structure.
The shape of the sealing guide groove can be square or semicircular, the dimension D5 in the figure 2 is ensured to meet the technical requirements of components, and meanwhile, a fillet is processed at a sharp corner in the sealing guide groove to avoid processing stress concentration points.
The filling metal strip is made of metal with good plasticity and toughness.
The cross section of the filling metal strip can be circular, square or polygonal, the cross section size of the filling metal strip is convenient for sealing welding, and meanwhile, the filling metal which is similar to the base metal or has better plasticity and toughness than the base metal can be selected.
Reasonable welding process and welding parameters are selected, manual welding or automatic welding process can be selected, and meanwhile wire filling welding process or non-wire filling welding process can be selected. The welding parameters are selected so as to achieve a certain weld penetration.
A structure for reducing residual stress of seam sealing welding comprises the following implementation steps:
(1) the end parts of the contact sealing surfaces of the upper and lower components are processed into sealing guide grooves, and the dimension D5 in the drawing 2 is ensured to meet the technical requirements after processing, for example, a square section is adopted, and a fillet is processed at a sharp corner to avoid stress concentration;
(2) the filler metal is processed, and the cross section shape and the size of the filler metal ensure that the welding is convenient. The plasticity and toughness of the filling material are not lower than the related indexes of the parent metal;
(3) reasonable welding parameters are selected to ensure the complete structure of the sealing weld and certain welding penetration.
Due to the adoption of the optimization on the structure, the material and the process, compared with the prior art, the invention has the following advantages:
(1) the movable filling metal is adopted to replace a structure with larger constraint degree of a welding line at the root part in the prior art, so that the welding at most part of rigid constraint degree in the prior art is changed into the welding at non-rigid constraint part, thereby playing the role of greatly reducing the residual stress of welding;
(2) different from the welding self-melting sealing mode adopted by the prior art, the invention can adopt filler metal with better plastic toughness, thereby ensuring that the plastic toughness of the weld metal is reduced by the weld metal in the prior art so as to reduce the risks of generating cracks and crack propagation;
(3) a welding seam with certain fusion depth is obtained by adopting a reasonable welding process and welding parameters, so that the sealing effect is better than that of the sealing in the prior art;
(4) each time such component repairs are performed, the prior art requires cutting the D-site in fig. 1 resulting in a reduction in dimension D1 in fig. 1, which results in component scrap when D1 is less than specification. The invention only needs to cut F in figure 4, so that the dimension D5 in figure 4 is not reduced in the process of maintenance, thereby greatly prolonging the service life of the components.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many 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 (6)
1. The utility model provides a reduce welded structure of seam sealing welding residual stress, includes that relative setting treats welded part upper part of the body and the part lower part of the body, its characterized in that:
the sealing surface that the relative setting of part upper part of the body and part lower part of the body is provided with upper groove and low groove respectively, upper groove and low groove form sealed guide slot, sealed guide slot intussuseption is filled with the metal strip, the metal strip with part upper part of the body, part lower part of the body pass through welded connection.
2. A weld structure for reducing residual stress of seam-seal welding according to claim 1, wherein:
the cross section of the sealing guide groove is square, and the inner chamfer of the sealing guide groove is an arc chamfer.
3. A weld structure for reducing residual stress of seam-seal welding according to claim 1, wherein:
the cross section of the sealing guide groove is semicircular.
4. A weld structure for reducing residual stress of seam-seal welding according to claim 1, wherein:
the cross section of the sealing guide groove is oval.
5. A welded structure for reducing residual stress in seam-seal welding according to claim 2, 3 or 4, wherein: the section of the metal strip is square, semicircular or polygonal.
6. A welding process for reducing residual stress of seam sealing welding is characterized by comprising the following steps:
(1) processing a sealing guide groove between the sealing surfaces of the upper body and the lower body of the component to be welded;
(2) selecting a reasonable filling metal material, processing the filling metal to enable the shape and the size of the cross section of the filling metal material and the fit clearance of the sealing guide groove to meet the technical requirements of a welding process, and placing a metal strip into the sealing guide groove;
(3) and welding and connecting the metal strip with the upper part of the component and the lower part of the component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911251925.2A CN111299895A (en) | 2019-12-09 | 2019-12-09 | Welding structure and process for reducing residual stress of seam sealing welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911251925.2A CN111299895A (en) | 2019-12-09 | 2019-12-09 | Welding structure and process for reducing residual stress of seam sealing welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111299895A true CN111299895A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911251925.2A Pending CN111299895A (en) | 2019-12-09 | 2019-12-09 | Welding structure and process for reducing residual stress of seam sealing welding |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101111345A (en) * | 2005-01-27 | 2008-01-23 | 三益精工株式会社 | A manufacturing method of machinery parts for linear motion and linear bushing manufactured by the above method |
| JP2011204396A (en) * | 2010-03-24 | 2011-10-13 | Sanyo Electric Co Ltd | Sealed battery and method for manufacturing the same |
| CN103752995A (en) * | 2013-12-20 | 2014-04-30 | 哈尔滨工业大学 | Valve stress dispersion based welding method |
| CN105127685A (en) * | 2015-09-22 | 2015-12-09 | 西安向阳航天材料股份有限公司 | Method for sealing weld of pipe end of mechanical bimetal composite pipe |
| CN110369819A (en) * | 2018-04-12 | 2019-10-25 | 浙江三花智能控制股份有限公司 | A kind of electric expansion valve |
-
2019
- 2019-12-09 CN CN201911251925.2A patent/CN111299895A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101111345A (en) * | 2005-01-27 | 2008-01-23 | 三益精工株式会社 | A manufacturing method of machinery parts for linear motion and linear bushing manufactured by the above method |
| JP2011204396A (en) * | 2010-03-24 | 2011-10-13 | Sanyo Electric Co Ltd | Sealed battery and method for manufacturing the same |
| CN103752995A (en) * | 2013-12-20 | 2014-04-30 | 哈尔滨工业大学 | Valve stress dispersion based welding method |
| CN105127685A (en) * | 2015-09-22 | 2015-12-09 | 西安向阳航天材料股份有限公司 | Method for sealing weld of pipe end of mechanical bimetal composite pipe |
| CN110369819A (en) * | 2018-04-12 | 2019-10-25 | 浙江三花智能控制股份有限公司 | A kind of electric expansion valve |
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Application publication date: 20200619 |