CN114910256A - Test method for rapidly determining matching gap critical value of lap joint welding head - Google Patents
Test method for rapidly determining matching gap critical value of lap joint welding head Download PDFInfo
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- CN114910256A CN114910256A CN202210131608.2A CN202210131608A CN114910256A CN 114910256 A CN114910256 A CN 114910256A CN 202210131608 A CN202210131608 A CN 202210131608A CN 114910256 A CN114910256 A CN 114910256A
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- 238000003466 welding Methods 0.000 title claims abstract description 207
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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Abstract
The invention discloses a test method for rapidly determining a critical value of a matching gap of a lap joint, belonging to the technical field of welding and comprising the steps of respectively obtaining a target welding seam requirement, a plate parameter and an actual process parameter; determining a lap joint matching gap test model according to the plate parameters; the lap joint is matched with a gap test model and welded according to actual process parameters to obtain a plurality of welding seam cross section data; and determining a design critical value of the lap joint matching gap according to a plurality of weld cross section data and target weld requirements. The invention can effectively reduce the test workload, greatly shorten the test period and reduce the corresponding resource waste, and simultaneously, the adaptability and the effectiveness of the subsequent test result are ensured because the related test verification is directly carried out on the basis of the welding process under the actual production and manufacturing.
Description
Technical Field
The invention discloses a test method for rapidly determining a critical value of a matching gap of a lap joint welding head, and belongs to the technical field of welding.
Background
In the development process of automobile products, a lap-joint type welding joint is the most widely adopted connecting structure form in product design. As with core welding quality control factors such as joint penetration, weld leg size, weld joint calculation thickness, etc., as one of the main input conditions for product design, the selection and determination of the lap joint matching gap between welded parts also directly affects the final welding quality and connection strength of the product. In order to ensure the controllability and consistency of the welding quality of products, the most important thing is to quickly determine the design critical value of the matching clearance of the welding area of the lap joint under the conditions of different parts, no material combination and different welding processes except for the premise that the welding quality control elements meet the design requirements.
The determination of the value of the matching gap of the lap welding head generally belongs to the core technology and the key commercial secret of the design of the vehicle-enterprise products, and the difficulty in obtaining the technology purchase is high and is mainly obtained through the following two modes. The first mode is to carry out extensive benchmarking and analysis on the lap joints of similar competitive vehicle types to obtain relevant data, and the second mode is to obtain relevant data through independent development and based on a large number of process tests. The first mode is high in cost and long in time period, the design critical value of the vehicle overlapping gap of a competitive vehicle model and the matching relation between the welding processes corresponding to the design critical value cannot be determined, the adaptability of later application is poor, the second mode is that two test material pieces are combined, the matching gap value is continuously adjusted, although relatively accurate data under a certain process condition can be obtained, the period is as long as the period and the workload is large, the working process needs to be repeated once when the process parameters are adjusted, and a large amount of resources and manpower are wasted. To date, no report or study has been found on a test method for rapidly determining the design threshold for the lap joint fit gap.
Disclosure of Invention
The invention aims to solve the technical problem of providing a test method for quickly determining a design critical value of a lap joint welding head matching gap aiming at the defects of the prior art.
The invention aims to solve the problems and is realized by the following technical scheme:
a test method for rapidly determining a threshold value of a lap weld joint match gap, comprising:
respectively acquiring target weld joint requirements, plate parameters and actual process parameters;
determining a lap joint matching gap test model according to the plate parameters;
welding the lap joint matching gap test model according to actual process parameters to obtain a plurality of welding seam cross section data;
determining a lap joint matching gap design threshold value from a plurality of weld cross section data and target weld requirements.
Preferably, the actual process parameters include: the system comprises an actual arc welding robot, an actual control cabinet, an actual welding power supply, an actual wire feeder, an actual welding gun and actual welding process parameters.
Preferably, the target weld seam requirements include: weld penetration, weld leg size, and weld calculated thickness.
Preferably, the actual welding process parameters include: welding current, welding voltage, welding speed, welding wire type and specification, wire feeding speed, welding gun angle, push-pull wire feeding mode, dry elongation, welding shielding gas type, welding shielding gas flow and welding shielding gas advance gas feeding and lag gas cutting time.
Preferably, the lap joint matching gap test model comprises a bottom plate and a lap plate with one end fixed on the top of the bottom plate, and the other end of the lap plate is connected with the bottom plate through a backing plate.
Preferably, the welding seam cross section data is obtained by welding the lap joint matching gap test model according to actual process parameters, and the method comprises the following steps:
welding one side of the lap joint plate and the bottom plate from the point A to the point C direction based on actual process parameters to obtain a lap joint test welding line, and obtaining a plurality of welding line cross section data through the lap joint test welding line, wherein the welding line cross section data comprises: and (4) calculating the weld penetration of the sample, the size of the welding leg of the sample and the weld thickness of the sample.
Preferably, determining lap joint match gap design threshold values from a plurality of said weld cross section data and target weld requirements comprises:
determining a starting point B for reducing the size of the welding leg according to the data of the cross section of the welding seam;
uniformly and sequentially acquiring a plurality of welding seam cross section data from the starting point B to the point C when the size of the welding leg is reduced, and respectively comparing the data with the target welding seam requirements;
and stopping obtaining when at least one item of the welding seam cross section data does not accord with the target welding seam requirement, wherein the welding seam cross section data is a design critical value of the lap joint matching gap.
Preferably, the size between the two adjacent weld cross section data is 5 mm.
Preferably, the height of the backing plate is: 8mm-15mm, the length of lapping plate (2) is: 250mm-800 mm.
Preferably, the thickness of the materials of the lap plate and the backing plate is as follows: 2mm-12 mm.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a test method for rapidly determining a critical value of a matching gap of a lap joint, which comprises the steps of designing and manufacturing a lap joint matching gap test model with continuous gap change characteristics, carrying out related test verification on a mature welding process based on actual production and manufacturing conditions and the same test material, and finally locking the critical value of the matching gap design capable of ensuring the optimal welding quality under the process conditions by means of a metallographic method.
Drawings
FIG. 1 is a flow chart of a test method of the present invention for rapidly determining a lap weld joint match gap threshold.
FIG. 2 is an isometric view of a lap joint match gap test model in a test method of rapidly determining a lap joint match gap threshold of the present invention.
FIG. 3 is a front view of a lap joint match gap test model in a test method for rapidly determining a lap joint match gap threshold of the present invention.
The welding method comprises the following steps of 1-base plate, 2-lap plate, 3-backing plate, 4-backing plate fixing weld joint, 5-first lap plate fixing weld joint, 6-second lap plate fixing weld joint, 7-lap joint test weld joint and 8-clearance angle bisector.
Detailed Description
The invention is further illustrated below with reference to the accompanying figures 1-3:
the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a first embodiment of the present invention provides 1, based on the prior art, a test method for quickly determining a threshold value of a matching gap of a lap joint, which includes the following specific steps:
step S10, respectively obtaining target weld joint indexes, plate parameters and actual process parameters, wherein the specific contents are as follows:
the target welding seam is a lap welding seam formed after different automobile metal parts are welded through an electric arc welding process, and the target welding seam indexes comprise: three indexes of weld penetration, weld leg size and weld calculated thickness are provided, and quality defects such as unfused, undercut, cracks and the like are avoided. The actual process parameters comprise an actual arc welding robot, an actual control cabinet, an actual welding power supply, an actual wire feeder, an actual welding gun and actual welding process parameters used for forming a target welding seam.
The actual welding process parameters include: welding current, welding voltage, welding speed, welding wire type and specification, wire feeding speed, welding gun angle, push-pull wire feeding mode, dry extension, welding shielding gas type, welding shielding gas flow and welding shielding gas advance air feeding and lag air cutting-off time. The sheet parameters include material type, state, thickness, performance and stacking and overlapping relationship of the actual automotive product.
Step S20, determining a lap joint matching gap test model according to the actual process parameters, wherein the specific contents are as follows:
determining a corresponding lap joint matching gap test model according to plate parameters, which comprises: the base plate 1, the lapping plate 2 and the backing plate 3. The two ends of the backing plate 3 are welded on the top of the bottom plate 1 through common arc welding to form a backing plate fixing weld seam 4, the bottom of one end, close to the lapping plate 2, of the backing plate is welded and fixed on the top of the backing plate 3 through common arc welding to form a first lapping plate fixing weld seam 5, and the other end of the lapping plate 2 is welded and fixed on the top of the bottom plate 1 through common arc welding to form a second lapping plate fixing weld seam 6.
Wherein, backing plate 3 highly be H, through the biggest clearance value of the overlap joint that forms between adjustment H's numerical value adjustment bottom plate 1 and the overlap plate 2, backing plate 3's high H's value range is: h is more than or equal to 8mm and less than or equal to 15mm, and the thickness ranges of the materials of the lap joint plate 2 and the backing plate 3 are as follows: 2mm-12mm, the length of the lapping plate (2) is as follows: 250mm-800mm, and the types of the manufacturing materials can be aluminum alloy, magnesium alloy and steel plate materials, the minimum gap value of the lapping plate 2 and the backing plate 3 at the first lapping plate fixing weld joint 5 is zero, and the gap value of the bottom plate 1 and the lapping plate 2 at the second lapping plate fixing weld joint 6 is zero.
Step S30, welding the lap joint matching gap test model to obtain weld cross section data;
welding one side of the lap joint plate 2 and the bottom plate 1 from a point A to a point C along the direction of a gap angle bisector 8 to obtain a lap joint test welding line 7, wherein the distance between the point A and the point with the zero gap is K, and the K is less than or equal to 5 mm; the distance between the point C and the point with the maximum clearance value is L, and L is less than or equal to 15 mm. The lap joint test weld 7 obtains a plurality of weld cross section data, which includes: and (4) calculating the weld penetration of the sample, the size of the welding leg of the sample and the weld thickness of the sample.
Step S40, determining a design critical value of a lap joint matching gap through a plurality of weld cross section data and target weld indexes, wherein the specific contents comprise:
in the welding process, along with the gradual increase of the matching clearance of the lap joint, the size of the welding leg of the lap joint is changed towards the direction of decreasing, so that a starting point B for the size decrease of the welding leg is determined;
firstly, carrying out metallographic detection and confirmation on the cross section of the welding seam at the point B, and if 3 indexes of welding seam penetration, welding leg size, welding seam calculation thickness and the like all meet the design requirements, uniformly and sequentially acquiring data of the cross section of the welding seam at intervals of 5mm from the starting point B to the point C when the size of the welding leg is reduced, and respectively comparing the data with the target welding seam index;
and until at least 1 unqualified welding seam cross section in the 3 indexes appears, the numerical value of the welding seam matching gap in the qualified welding seam cross section closest to the unqualified welding seam cross section is the critical value Hmax of the lap joint matching gap under the process condition.
Therefore, in order to ensure the consistency and stability of the welding quality of parts of the whole vehicle and the key core assembly, when a product is designed, the design critical value M of the matching clearance of the lap joint at least needs to meet the following requirements: m is less than or equal to Hmax.
The following will be made according to a specific example 1 of the above method:
and determining the critical design clearance value of a certain automobile chassis used when a Q345 steel plate with the thickness of 5.0mm and a 355L steel plate with the thickness of 6.0mm are subjected to lap welding, wherein the lap sequence is that the Q345 steel plate is arranged above the 355L steel plate. The welding quality requirements are as follows: the size of the welding leg is more than or equal to 4.0mm, the fusion depth is more than or equal to 0.5mm, the calculated thickness of the welding seam is more than or equal to 2.5mm, and the welding material is H08Mn2SiA welding wire with the diameter of 1.2 mm. The welding process parameters are shown in table 1.
TABLE 1 welding Process parameters
And step S10, respectively acquiring target weld joint requirements, plate parameters and actual process parameters.
The target weld seam requirements are: the size of a welding leg is more than or equal to 4.0mm, the penetration is more than or equal to 0.5mm, the calculated thickness of a welding seam is more than or equal to 2.5mm, the parameters of a plate are that a Q345 steel plate with the thickness of 5.0mm is welded with a 355L steel plate with the thickness of 6.0mm in an overlapping mode, the overlapping sequence is that the Q345 steel plate is arranged above the 355L steel plate, and the actual technological parameters comprise that the welding material is an H08Mn2SiA welding wire with the diameter of 1.2mm and the welding technological parameters in the table 1.
And step S20, determining a lap joint matching gap test model according to the plate parameters.
The lap joint matching gap test model consists of a bottom plate 1, a lap plate 2 and a base plate 3. The bottom plate 1 was made of 355L steel 6.0mm thick, and the strap 2 was made of Q345 steel 5.0mm thick. The manufacturing material of the backing plate 3 is 2mm thick Q345 steel plate, so that good material weldability with the manufacturing materials of the bottom plate 1, the lapping plate 2 and the backing plate 3 is ensured, and effective fixed connection can be realized by a manual common steel plate electric arc welding method. The backing plate 3 is fixedly connected on the bottom plate 1 through backing plate fixing welding lines 4, and the number of the backing plate fixing welding lines 4 is 2, and the backing plate fixing welding lines are symmetrical left and right.
The lap joint plates 2 are fixedly connected on the backing plate 3 through first lap joint plate fixing welding lines 5, the number of the first lap joint plate fixing welding lines 5 is 2, and the first lap joint plate fixing welding lines are symmetrical left and right; at the same time, the strap 2 is fixedly connected to the base plate 1 by means of a second strap fixing weld 6.
The height of the backing plate 3 is H, and the value range of H is as follows: h is not less than 8mm and not more than 15mm, the maximum gap value of the lap joint formed between the bottom plate 1 and the lap plate 2 is adjusted by adjusting the value of H, and the length value range of the lap plate (2) is as follows: 250mm-800 mm.
And step S30, welding the lap joint matching gap test model according to actual process parameters to obtain a plurality of welding seam cross section data.
The steel plate arc welding process selects CO2 gas shielded automatic welding which is the same as the current production by combining the weldability characteristics of Q345 steel plate and 355L steel plate materials, and the welding wire material also selects H08Mn2SiA welding wire with the diameter of 1.2 mm. Welding is carried out based on actual process parameters, welding is carried out from the point A to the point C along the direction of the angular bisector 8 of the gap, and the preparation of the lap joint test welding seam 7 is completed. The distance between the point A and the point with the zero gap is K which is 3 mm; the distance between the point C and the point with the maximum clearance value is L which is 15mm, and a plurality of welding seam cross section data are obtained on the lap joint test welding seam 7.
And step S40, determining a design critical value of a lap joint matching gap according to a plurality of weld cross section data and target weld requirements.
During the welding process, as the matching gap of the lap joint is gradually increased, the size of the weld leg of the lap joint is changed towards the direction of decreasing, and a starting point B is obtained when the size of the weld leg begins to decrease.
Firstly carrying out metallographic detection and confirmation on the cross section of the welding seam at the point B, if 3 indexes such as welding seam penetration, welding leg size, welding seam calculation thickness and the like all meet design requirements, taking a section from the point B towards the welding direction at intervals of 5mm and carrying out metallographic detection, when the 4 th section is taken, at least 1 unqualified welding seam cross section in the 3 indexes appears for the first time, the numerical value of the welding seam matching gap in the qualified welding seam cross section closest to the unqualified welding seam cross section is the critical value Hmax of the lap joint matching gap under the process condition, and the critical value Hmax is 2.35mm through metallographic detection.
Therefore, in order to ensure the consistency and stability of the welding quality of parts of the whole vehicle and the key core assembly, when a product is designed, the design critical value M of the matching clearance of the lap joint at least needs to meet the following requirements: and M is less than or equal to Hmax, namely M is less than or equal to 2.35 mm.
The above test results show that: the design value of the maximum gap of the lap joint is selected to be less than or equal to 2.35mm, the influence of possible fluctuation and numerous uncontrollable factors of a welding process is considered, the selection range of the gap of the lap joint can be further reduced during the design of an actual product, and the design value can be determined by comprehensive consideration according to actual production and specific product requirements.
The following will be made according to a specific example 2 of the above method:
and determining the critical design clearance value of 6mm thick 6082-T6 aluminum profile and 8.0mm thick 6082-T6 aluminum profile for a certain automobile body frame during lap welding, wherein the lap sequence is 6mm thick 6082-T6 aluminum profile on top and 8.0mm thick 6082-T6 aluminum profile on the bottom. The welding quality requirements are as follows: the size of the welding leg is more than or equal to 5.0mm, the fusion depth is more than or equal to 1.0mm, the calculated thickness of the welding seam is more than or equal to 3.5mm, and the welding material is an ER5356 aluminum alloy welding wire with the diameter of 1.2 mm. The welding process parameters are shown in table 2.
TABLE 2 welding Process parameters
And step S10, respectively acquiring target weld joint requirements, plate parameters and actual process parameters.
The target weld seam requirements are: the size of a welding leg is more than or equal to 5.0mm, the penetration is more than or equal to 1.0mm, the calculated thickness of a welding seam is more than or equal to 3.5mm, the parameters of the plate are 6mm thick 6082-T6 aluminum section and 8.0mm thick 6082-T6 aluminum section in lap joint, the lap joint sequence is 6mm thick 6082-T6 aluminum section above and 8.0mm thick 6082-T6 aluminum section below, and the actual technological parameters comprise that the welding material is ER5356 aluminum alloy welding wire with the diameter of 1.2mm and the welding technological parameters in Table 1.
And step S20, determining a lap joint matching gap test model according to the plate parameters.
The lap joint matching gap test model consists of a bottom plate 1, a lap plate 2 and a base plate 3. The bottom plate 1 is made of 6082-T6 aluminum profiles with the thickness of 8.0mm, and the lapping plate 2 is made of 6082-T6 aluminum profiles with the thickness of 6.0 mm. The manufacturing material of the backing plate 3 is a 6082-T6 aluminum profile with the thickness of 3mm, so that good material weldability with the manufacturing materials of the bottom plate 1, the lapping plate 2 and the backing plate 3 is ensured, and effective fixed connection can be realized by a manual common aluminum alloy arc welding method. The backing plate 3 is fixedly connected on the bottom plate 1 through backing plate fixing welding lines 4, and the number of the backing plate fixing welding lines 4 is 2, and the backing plate fixing welding lines are symmetrical left and right.
The lap joint plates 2 are fixedly connected on the backing plate 3 through first lap joint plate fixing welding lines 5, the number of the first lap joint plate fixing welding lines 5 is 2, and the first lap joint plate fixing welding lines are symmetrical left and right; at the same time, the strap 2 is fixedly connected to the base plate 1 by means of a second strap fixing weld 6.
The height of the backing plate 3 is H, and the value range of H is as follows: h is not less than 8mm and not more than 15mm, the maximum gap value of the lap joint formed between the bottom plate 1 and the lap plate 2 is adjusted by adjusting the value of H, and the length value range of the lap plate (2) is as follows: 250mm-800 mm. .
And step S30, welding the lap joint matching gap test model according to actual process parameters to obtain a plurality of welding seam cross section data.
The aluminum alloy arc welding process selects the same MIG automatic welding as the existing production by combining the weldability characteristics of 6082-T6 aluminum profiles, and the ER5356 welding wire with the diameter of 1.2mm is also selected as the welding wire material. And (3) welding the lap joint matched gap test sample based on actual welding process parameters, wherein the welding track is from the point A to the point C and is welded along the approximate direction of the gap angular bisector 8, and the preparation of the lap joint test weld joint is finished. The distance between the point A and the point with the zero clearance is K equal to 4 mm; the distance between the point C and the point with the maximum clearance value is L which is 12mm, and a plurality of weld cross section data are obtained on the lap joint test weld 7.
And step S40, determining a design critical value of a lap joint matching gap according to a plurality of weld cross section data and target weld requirements.
During the welding process, as the matching gap of the lap joint is gradually increased, the size of the weld leg of the lap joint is changed towards the direction of decreasing, and a starting point B is obtained when the size of the weld leg begins to decrease.
Firstly carrying out metallographic detection and confirmation on the cross section of the welding seam at the point B, if 3 indexes such as welding seam penetration, welding leg size, welding seam calculation thickness and the like all meet design requirements, taking a section from the point B towards the welding direction at intervals of 5mm and carrying out metallographic detection, when the 6 th section is taken, at least 1 unqualified welding seam cross section in the 3 indexes appears for the first time, the numerical value of the welding seam matching gap in the qualified welding seam cross section closest to the unqualified welding seam cross section is the critical value Hmax of the lap joint matching gap under the process condition, and the critical value Hmax is 3.05mm through metallographic detection.
In order to ensure the consistency and stability of the welding quality of parts of the whole vehicle and the key core assembly, when designing a product, the design critical value M of the matching clearance of the lap joint at least needs to meet the following requirements: m is less than or equal to Hmax, namely M is less than or equal to 3.15 mm.
The above test results show that: the design value of the maximum gap of the lap joint is selected to be less than or equal to 3.15mm, the influence of possible fluctuation and numerous uncontrollable factors of a welding process is considered, the selection range of the gap of the lap joint can be further reduced during the design of an actual product, and the design value can be determined by comprehensive consideration according to actual production and specific product requirements.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (10)
1. A test method for rapidly determining a threshold value of a lap joint weld joint match gap, comprising:
respectively acquiring target weld joint requirements, plate parameters and actual process parameters;
determining a lap joint matching gap test model according to the plate parameters;
the lap joint is matched with a gap test model and welded according to actual process parameters to obtain a plurality of weld cross section data;
and determining a design critical value of the lap joint matching gap according to a plurality of weld cross section data and target weld requirements.
2. The test method for rapidly determining a lap weld joint match gap threshold of claim 1, wherein the actual process parameters comprise: the system comprises an actual arc welding robot, an actual control cabinet, an actual welding power supply, an actual wire feeder, an actual welding gun and actual welding process parameters.
3. A test method for rapidly determining lap weld joint match gap threshold as defined in claim 2 wherein said target weld requirements include: weld penetration, weld leg size, and weld calculated thickness.
4. A test method for rapidly determining lap weld joint match gap threshold as claimed in claim 2 or 3, wherein said actual welding process parameters comprise: welding current, welding voltage, welding speed, welding wire type and specification, wire feeding speed, welding gun angle, push-pull wire feeding mode, dry extension, welding shielding gas type, welding shielding gas flow and welding shielding gas advance air feeding and lag air cutting-off time.
5. The test method for rapidly determining the threshold value of the lap joint matching gap according to claim 1, wherein the lap joint matching gap test model comprises a base plate (1) and a lap plate (2) with one end fixed on the top of the base plate, and the other end of the lap plate (2) is connected with the base plate (1) through a backing plate (3).
6. The test method for rapidly determining the critical value of the matching gap of the lap joint welding head as claimed in claim 5, wherein the step of welding the test model of the matching gap of the lap joint welding head according to the actual process parameters to obtain the data of the cross section of the welding seam comprises the following steps:
welding one side of the lap joint plate (2) and the bottom plate (1) from a point A to a point C direction based on actual process parameters to obtain a lap joint test welding line, and obtaining a plurality of welding line cross section data through the lap joint test welding line, wherein the welding line cross section data comprises: and (4) calculating the weld penetration of the sample, the size of the welding leg of the sample and the weld thickness of the sample.
7. The test method for rapidly determining a lap joint match gap threshold of claim 1, wherein determining a lap joint match gap design threshold from a plurality of the weld cross section data and target weld requirements comprises:
determining a starting point B for reducing the size of the welding leg according to the data of the cross section of the welding seam;
uniformly and sequentially acquiring a plurality of welding seam cross section data from the starting point B to the point C when the size of the welding leg is reduced, and respectively comparing the data with the target welding seam requirements;
and stopping obtaining when at least one item of the welding seam cross section data does not accord with the target welding seam requirement, wherein the welding seam cross section data is a design critical value of the lap joint matching gap.
8. The test method for rapidly determining the threshold value of the lap weld joint match gap according to claim 7, wherein the size between the two adjacent weld cross-sectional data is 5 mm.
9. Test method for the rapid determination of the threshold value of the lap weld joint match clearance according to claim 6, characterized in that the height of the shim plate (3) is: 8mm-15mm, and the length of the lapping plate (2) is 250mm-800 mm.
10. Test method for the rapid determination of the threshold value of the matching gap of lap weld joints according to claim 6, characterized in that the material thickness of said lap plate (2) and backing plate (3) is: 20mm-12 mm.
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| CN114910257A (en) * | 2022-02-14 | 2022-08-16 | 中国第一汽车股份有限公司 | Test method for rapidly determining design critical value of matching clearance of T-shaped angle joint |
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