CN106501320B - Nondestructive method for detecting welding seam fusion degree of stud and special probe - Google Patents

Nondestructive method for detecting welding seam fusion degree of stud and special probe Download PDF

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CN106501320B
CN106501320B CN201610934335.XA CN201610934335A CN106501320B CN 106501320 B CN106501320 B CN 106501320B CN 201610934335 A CN201610934335 A CN 201610934335A CN 106501320 B CN106501320 B CN 106501320B
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stud
electrode contact
positive electrode
contact
negative electrode
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CN106501320A (en
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李伟
孟庆彪
张建民
齐杭宾
冯宝纯
韩莹
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Baoding Tianwei Baobian Electric Co Ltd
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Baoding Tianwei Baobian Electric Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Abstract

The invention relates to a nondestructive method for detecting the fusion degree of a stud welding line and a special probe, belonging to the technical field of detection equipment. The technical proposal is as follows: when the welding line of the stud has poor fusion defect, the size of the welding line bonding area is directly changed, and then the change of the measured value on the screen of the direct current resistance tester (11) is reflected; the direct current resistance tester displays the difference between the measured value and the standard value, thereby completing nondestructive testing of the welding seam fusion degree of the stud. The special probe adopts an integrated structure of the positive and negative contacts, and has the advantages of large contact area, uniform stress, simple structure, flexible operation, high detection efficiency and small error during measurement. The welding stud fusion degree is measured by the direct current resistance method, the damage to the stud and the welding seam strength is avoided, the operation is convenient, the detection efficiency is high, and the welding stud fusion degree is suitable for mass rapid detection on production lines and operation sites.

Description

Nondestructive method for detecting welding seam fusion degree of stud and special probe
Technical Field
The invention relates to a nondestructive method for detecting the fusion degree of a stud welding line and a special probe, belonging to the technical field of detection equipment.
Background
Stud welding is widely applied to various fields such as automobile manufacturing industry, mechanical equipment manufacturing industry, steel structure engineering and the like, and due to the fact that the stud welding is affected by various factors such as welding equipment, welding parameter selection and welding operation, the defect that welding seams between a stud and a workpiece are poor in fusion often occurs, the strength of the welding seams of the stud is greatly reduced due to the fact that the local defect of non-fusion, and then the stud is stressed to break and fall. At present, when the welding line fusion condition of a stud is detected, destructive tests such as a torque test, a bending test and the like are often used, and even if the stud is qualified in the withstand failure test, the mechanical property of the stud is damaged to a certain extent. The common ray detection and ultrasonic detection methods are limited by various parameter conditions, so that the method is not suitable for detecting the fusion degree of a large number of stud welding seams on a construction site.
Disclosure of Invention
The invention aims to provide a nondestructive method and a special probe for detecting the welding seam fusion degree of a stud, which are flexible in operation, convenient, quick and accurate in completing nondestructive detection, and effectively solve the problems in the prior art.
The technical scheme of the invention is as follows:
the utility model provides a special probe of no damage for detecting double-screw bolt welding seam fusion degree, contains negative pole contact, insulating sleeve, anodal contact, truncated cone helical compression spring, insulating base, anodal signal wire, negative pole signal wire, work piece and welding double-screw bolt, the negative pole contact is annular contact, anodal contact is disk contact, truncated cone helical compression spring's tip and anodal contact interconnect, big end and insulating base interconnect, anodal contact, truncated cone helical compression spring set up in insulating sleeve's inside, insulating base sets up in insulating sleeve's bottom, the negative pole contact sets up in insulating sleeve's outside, anodal signal wire passes insulating base center round hole and helical compression spring's inside back and interconnects with anodal contact, negative pole signal wire is connected with negative pole contact interconnect after the outside is fixed with insulating sleeve winding, insulating sleeve back-off sets up on the work piece that has welded the double-screw bolt, negative pole contact and work piece contact each other, anodal contact and welding double-screw bolt's top contact each other.
The negative electrode contact and the positive electrode contact are made of copper.
The distance from the lower surface of the positive electrode contact to the lower surface of the negative electrode contact is more than 5 mm less than the length of the welding stud.
The disc-shaped positive electrode contact freely moves in the sleeve along with the expansion and contraction of the spring, and the distance from the lower surface of the disc-shaped positive electrode contact to the lower surface of the annular negative electrode contact is smaller than the length of the stud when the truncated cone spiral compression spring and the disc-shaped positive electrode contact are only subjected to gravity.
A non-destructive method for detecting the degree of fusion of a stud weld, comprising the steps of:
Figure 100002_DEST_PATH_IMAGE002
the special probe is adopted, the special probe comprises a negative electrode contact, an insulating sleeve, a positive electrode contact, a truncated cone helical compression spring, an insulating base, a positive electrode signal wire, a negative electrode signal wire, a workpiece and a welding stud, wherein the negative electrode contact is an annular contact, the positive electrode contact is a disc-shaped contact, the small end of the truncated cone helical compression spring is connected with the positive electrode contact, the large end of the truncated cone helical compression spring is connected with the insulating base, the positive electrode contact and the truncated cone helical compression spring are arranged in the insulating sleeve, the insulating base is arranged at the bottom of the insulating sleeve, the negative electrode contact is arranged outside the insulating sleeve, the positive electrode signal wire is connected with the positive electrode contact after passing through a central round hole of the insulating base and the inside of the truncated cone helical compression spring, and the negative electrode signal wire is connected with the negative electrode contact after being wound and fixed with the insulating sleeve;
Figure 100002_DEST_PATH_IMAGE004
the insulating sleeve is reversely buckled on the workpiece welded with the welding stud, the negative electrode contact is contacted with the workpiece, and the positive electrode contact is contacted with the top of the welding stud; the stud, the welding seam and the workpiece are regarded as a whole, and two lead ends of the direct current resistance tester are respectively connected with a positive electrode signal wire and a negative electrode signal wire;
Figure 100002_DEST_PATH_IMAGE006
when direct current flows through the conductor, the current is uniformly distributed on the current carrying section of the conductor and has no skin effect like alternating current; according to ohm's law, when the measured resistor is electrified with direct current, the current in the measured resistor and the voltage drop at two ends of the measured resistor are measured, the resistance value of the measured resistor can be calculated, and the resistance value of the measured resistor depends on the resistivity, the resistance length and the sectional area; when the stud welding line has poor fusion defect, the welding is directly causedThe size of the seam bonding area changes, and then the change of the measured value on the screen of the direct current resistance tester is reflected; the direct current resistance tester displays the difference between the measured value and the standard value, thereby completing nondestructive testing of the welding seam fusion degree of the stud.
The direct current resistance tester is a well-known and public instrument; the conversion formulas and the comparison tables of the welding bolts with different specifications and the welding seam fusion surfaces are known in the art, and the measured theoretical calculation results are compared with the comparison tables, so that the welding seam fusion degree of the stud can be rapidly and intuitively judged.
The beneficial effects of the invention are as follows: the special probe adopts an integrated structure of the positive contact and the negative contact, leads out signal wires from the positive contact and the negative contact respectively to be connected with the detection instrument, has the contact form of surface contact between the direct current resistance tester and the detected piece, has large contact area, uniform stress during measurement, simple structure and flexible operation, overcomes various defects of a split measuring pen or a measuring clamp, has high detection efficiency and small error, and is suitable for mass rapid detection on production lines and operation sites. The welding stud fusion degree is measured by the direct current resistance method, the damage to the stud and the welding seam strength is avoided, the operation is convenient, the detection efficiency is high, and the welding stud fusion degree is suitable for mass rapid detection on production lines and operation sites.
Drawings
FIG. 1 is a diagram of the structure of a dedicated probe in an embodiment of the invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic diagram of an embodiment of the present invention;
in the figure: the device comprises a negative electrode contact 1, an insulating sleeve 2, a positive electrode contact 3, a truncated cone helical compression spring 4, an insulating base 5, a positive electrode signal wire 6, a negative electrode signal wire 7, a workpiece 8, a welding stud 9, a welding seam 10, a direct current resistance tester 11 and a comparison table 12.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
The utility model provides a detect probe of double-screw bolt welding seam fusion degree, include negative pole contact 1, insulating sleeve 2, anodal contact 3, truncated cone helical compression spring 4, insulating base 5, anodal signal wire 6, negative pole signal wire 7, work piece 8 and welding double-screw bolt 9, negative pole contact 1 is annular contact, anodal contact 3 is disk contact, the tip and anodal contact 3 interconnect of truncated cone helical compression spring 4, the big end and insulating base 5 interconnect, anodal contact 3, truncated cone helical compression spring 4 sets up in insulating sleeve's 2 inside, insulating base 5 sets up the bottom at insulating sleeve 2, negative pole contact 1 sets up in insulating sleeve's 2 outside, anodal signal wire 6 is connected with anodal contact 3 after passing insulating base 5 centre round hole and the inside of helical compression spring 4, negative pole signal wire 7 is connected with negative pole contact 1 after the outside is fixed with insulating sleeve 2 winding, insulating sleeve 2 back-off sets up on the work piece that has welded welding double-screw bolt 9, negative pole contact 1 and work piece 8 contact each other, anodal contact 3 and welding double-screw bolt 9 top contact each other.
The negative electrode contact 1 and the positive electrode contact 3 are made of copper.
The distance from the lower surface of the positive contact 3 to the lower surface of the negative contact 1 is less than the length of the welding stud 9 by more than 5 mm.
The disc-shaped positive electrode contact freely moves in the sleeve along with the expansion and contraction of the spring, and the distance from the lower surface of the disc-shaped positive electrode contact to the lower surface of the annular negative electrode contact is smaller than the length of the stud when the truncated cone spiral compression spring and the disc-shaped positive electrode contact are only subjected to gravity.
A non-destructive method for detecting the degree of fusion of a stud weld, comprising the steps of:
Figure 375363DEST_PATH_IMAGE002
the probe comprises a negative electrode contact, an insulating sleeve, a positive electrode contact, a truncated cone helical compression spring, an insulating base, a positive electrode signal wire, a negative electrode signal wire, a workpiece and a welding stud, wherein the negative electrode contact is an annular contact, the positive electrode contact is a disc-shaped contact, the small end of the truncated cone helical compression spring is mutually connected with the positive electrode contact, the large end of the truncated cone helical compression spring is mutually connected with the insulating base, the positive electrode contact and the truncated cone helical compression spring are arranged in the insulating sleeve, and the insulating baseThe negative electrode signal wire is connected with the negative electrode contact after passing through a central round hole of the insulating base and the inside of the truncated cone helical compression spring;
Figure DEST_PATH_IMAGE007
when the welding seam fusion degree of the stud is detected, firstly, connecting the positive and negative signal wires of the special probe with a direct current resistance tester 11 for calibration; after the calibration of the direct current resistance tester 11 is finished, the special probe is reversely buckled on the workpiece welded with the stud, so that the negative electrode contact is in good contact with the workpiece, and the positive electrode contact is also in close contact with the top of the stud under the comprehensive acting force of the upper top of the stud and the downward pressing of the spring, so that the positive electrode electric signal and the negative electrode electric signal are conducted through the positive electrode contact, the welded stud, the workpiece and the negative electrode contact; the stud, the welding line 10 and the workpiece are regarded as a whole, and two lead ends of the direct current resistance tester are respectively connected with a positive electrode signal wire and a negative electrode signal wire;
Figure DEST_PATH_IMAGE008
when direct current flows through the conductor, the current is uniformly distributed on the current carrying section of the conductor and has no skin effect like alternating current; according to ohm's law, when the measured resistor is electrified with direct current, the current in the measured resistor and the voltage drop at two ends of the measured resistor are measured, the resistance value of the measured resistor can be calculated, and the resistance value of the measured resistor depends on the resistivity, the resistance length and the sectional area; when the welding line of the stud has poor fusion, the size of the combined area of the welding line 10 is directly changed, and then the change of the measured value on the screen of the direct current resistance tester is reflected; and then, judging the fusion degree of the stud weld seam based on theoretical calculation and comparison.
The direct current resistance tester is a well-known and public instrument; the conversion formulas of the welding bolts with different specifications and the welding seam fusion surfaces and the comparison table 12 are well known in the art, and the measured theoretical calculation result is compared with the comparison table, so that the welding seam fusion degree of the stud can be rapidly and intuitively judged.
In practical application, when detecting the welding seam fusion degree of the stud, firstly connecting the positive and negative signal wires of the special probe with a direct current resistance tester for calibration; after the calibration of the direct current resistance tester is finished, the special probe is reversely buckled on the workpiece welded with the stud, so that the negative electrode contact is in good contact with the workpiece, the positive electrode contact is also in close contact with the top of the stud under the comprehensive acting force of the upper top of the stud and the downward pressing of the spring, and thus the positive electrode electric signal and the negative electrode electric signal are conducted through the positive electrode contact, the welding stud, the workpiece and the negative electrode contact, the direct current resistance tester displays the difference between the measured value and the standard value, and the nondestructive testing of the welding seam fusion degree of the stud is completed.

Claims (5)

1. A special probe of no damage for detecting double-screw bolt welding seam fusion degree, its characterized in that: the electric power source comprises a negative electrode contact (1), an insulating sleeve (2), a positive electrode contact (3), a truncated cone spiral compression spring (4), an insulating base (5), a positive electrode signal wire (6), a negative electrode signal wire (7), a workpiece (8) and a welding stud (9), wherein the negative electrode contact (1) is an annular contact, the positive electrode contact (3) is a disc-shaped contact, the small end of the truncated cone spiral compression spring (4) is mutually connected with the positive electrode contact (3), the large end is mutually connected with the insulating base (5), the positive electrode contact (3) and the truncated cone spiral compression spring (4) are arranged in the insulating sleeve (2), the insulating base (5) is arranged at the bottom of the insulating sleeve (2), the negative electrode contact (1) is arranged outside the insulating sleeve (2), the positive electrode signal wire (6) passes through a central round hole of the insulating base (5) and the inside of the truncated cone spiral compression spring (4) and then is mutually connected with the positive electrode contact (3), the negative electrode signal wire (7) is mutually connected with the negative electrode contact (1) after being wound and fixed with the insulating sleeve (2) in an external side, the insulating sleeve (2) is reversely buckled and is welded with the workpiece (8) and the workpiece (8) is mutually contacted with the negative electrode contact stud (8), the positive contact (3) is contacted with the top of the welding stud (9).
2. A non-destructive dedicated probe for detecting stud weld fusion according to claim 1, wherein: the negative electrode contact (1) and the positive electrode contact (3) are made of copper.
3. A non-destructive dedicated probe for detecting stud weld fusion according to claim 1, wherein: the distance from the lower surface of the positive electrode contact (3) to the lower surface of the negative electrode contact (1) is more than 5 mm less than the length of the welding stud (9).
4. A non-destructive dedicated probe for detecting stud weld fusion according to claim 1 or 2, characterized in that: the disc-shaped positive electrode contact freely moves in the sleeve along with the expansion and contraction of the spring, and the distance from the lower surface of the disc-shaped positive electrode contact to the lower surface of the annular negative electrode contact is smaller than the length of the stud when the truncated cone spiral compression spring and the disc-shaped positive electrode contact are only subjected to gravity.
5. A non-destructive method for detecting the fusion degree of a stud weld, comprising the steps of:
Figure DEST_PATH_IMAGE002
the special probe is adopted, the special probe comprises a negative electrode contact (1), an insulating sleeve (2), a positive electrode contact (3), a truncated cone spiral compression spring (4), an insulating base (5), a positive electrode signal wire (6), a negative electrode signal wire (7), a workpiece (8) and a welding stud (9), wherein the negative electrode contact is an annular contact, the positive electrode contact is a disc-shaped contact, the small end of the truncated cone spiral compression spring is mutually connected with the positive electrode contact, the large end of the truncated cone spiral compression spring is mutually connected with the insulating base, the positive electrode contact and the truncated cone spiral compression spring are arranged in the insulating sleeve, the insulating base is arranged at the bottom of the insulating sleeve, the negative electrode contact is arranged outside the insulating sleeve, the positive electrode signal wire is mutually connected with the positive electrode contact after passing through a central round hole of the insulating base and the inside of the truncated cone spiral compression spring, and the negative electrode signal wire is fixedly wound with the insulating sleeve in the outer sideAnd then is connected with the negative electrode contact; />
Figure DEST_PATH_IMAGE004
The insulating sleeve is reversely buckled on the workpiece welded with the welding stud, the negative electrode contact is contacted with the workpiece, and the positive electrode contact is contacted with the top of the welding stud; the stud, the welding seam (10) and the workpiece are regarded as a whole, and two lead ends of the direct current resistance tester are respectively connected with a positive signal wire and a negative signal wire; />
Figure DEST_PATH_IMAGE006
When direct current flows through the conductor, the current is uniformly distributed on the current carrying section of the conductor and has no skin effect like alternating current; according to ohm's law, when the measured resistor is electrified with direct current, the current in the measured resistor and the voltage drop at two ends of the measured resistor are measured, the resistance value of the measured resistor can be calculated, and the resistance value of the measured resistor depends on the resistivity, the resistance length and the sectional area; when the welding line of the stud has poor fusion defect, the size of the welding line bonding area is directly changed, and then the change of the measured value on the screen of the direct current resistance tester (11) is reflected; the direct current resistance tester displays the difference between the measured value and the standard value, thereby completing nondestructive testing of the welding seam fusion degree of the stud.
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WO2020087519A1 (en) * 2018-11-02 2020-05-07 大族激光科技产业集团股份有限公司 Quality test device, method, and system, and integrated probe assembly
CN109596677A (en) * 2018-11-02 2019-04-09 大族激光科技产业集团股份有限公司 A kind of quality detection device, method, system and integrated probe component

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