阅读说明：本技术 桥梁钢结构焊缝检测方法 (Bridge steel structure weld joint detection method ) 是由 于进 戴燕君 凌敏华 于 2020-04-16 设计创作，主要内容包括：本发明公开了一种桥梁钢结构焊缝检测方法,包括以下步骤：S1：检测人员先将需要检测的位置的污垢除净后,凭肉眼目视焊缝,必要时用5～20倍的放大镜,看是否存在咬边、弧坑、焊瘤、夹渣、裂纹、气孔、未焊透等缺陷；S2：检测人员用标记帖对需要进行焊缝超声检测的桥梁钢结构一一做好标记,检测人员在对需要进行焊缝检测的桥梁钢结构做标记的同时,将有明显外观不合格的桥梁钢结构做重点标记；S3：选用透声性能好的耦合剂涂抹在需要检测的桥梁钢结构焊缝处；S4：采用脉冲反射式超声波检测仪器,探测仪器的探头扫查速度不大于150mm/s,相邻的两次扫查至少应有探头晶片宽度10％的重叠。本发明能够让桥梁钢结构焊缝的检测更加的准确和快速。(The invention discloses a bridge steel structure weld joint detection method, which comprises the following steps: s1: firstly, removing dirt on a position to be detected by a detector, visually observing a welding line by naked eyes, and using a magnifying lens of 5-20 times to see whether the defects of undercut, arc pits, welding beading, slag inclusion, cracks, air holes, incomplete welding and the like exist or not if necessary; s2: the method comprises the following steps that a detection person marks the bridge steel structures needing to be subjected to weld joint ultrasonic detection one by using a mark post, and the detection person marks the bridge steel structures needing to be subjected to weld joint detection and simultaneously marks the bridge steel structures with obvious unqualified appearances as key marks; s3: selecting a coupling agent with good sound transmission performance to be coated on the welding seam of the bridge steel structure to be detected; s4: the pulse reflection type ultrasonic detection instrument is adopted, the probe scanning speed of the detection instrument is not more than 150mm/s, and the adjacent two scanning processes should be overlapped by at least 10% of the width of the probe wafer. The method can enable the detection of the welding line of the bridge steel structure to be more accurate and rapid.)

1. A bridge steel structure weld joint detection method is characterized by comprising the following steps:

s1: firstly, removing dirt on a position to be detected by a detector, visually observing a welding line by naked eyes, using a magnifying lens of 5-20 times to see whether the defects of undercut, arc pits, welding beading, slag inclusion, cracks, air holes, incomplete welding and the like exist or not if necessary, and checking whether the welding line is smooth and whether welding slag, splashes and the like are cleaned up or not;

s2: the method comprises the following steps that a detection person marks the bridge steel structures needing to be subjected to weld joint ultrasonic detection one by using a mark post, and the detection person marks the bridge steel structures needing to be subjected to weld joint detection and simultaneously marks the bridge steel structures with obvious unqualified appearances as key marks;

s3: selecting a coupling agent with good sound transmission performance, namely a viscous solution of a mixture of carboxymethyl cellulose and tap water, and coating the viscous solution on the welding line of the bridge steel structure to be detected;

s4: according to the characteristics and requirements of the welding seam of the steel box girder, a pulse reflection type ultrasonic detection instrument is adopted to detect the welding seams of the top of the steel box girder, the longitudinal and transverse butt welding seams of the bottom plate, the longitudinal butt welding seam of the web plate, the penetration welding seams between the web plate and the top plate, the bottom plate and the like, the probe scanning speed of the detection instrument is not more than 150mm/s, and at least 10% of the width of a probe wafer should be overlapped in two adjacent scanning;

s5: and (3) evaluating ultrasonic flaw detection defects inside the welding seam according to the defect grade evaluation specified in the technical Specification for highway bridge and culvert construction, and if the defects exceed the standard, issuing a repair notice to a responsible person on the construction site, and rechecking the repaired defect until the defect is qualified.

2. The bridge steel structure weld detection method according to claim 1, characterized in that: when scanning is performed in step S4, the probe of the probe apparatus should be moved in a "W" shape with a 10-15 ° swing, and various scanning modes such as front and back, left and right, turning angle, and circling should be added according to the need of echo signals in order to determine the position, direction, and shape of the defect and observe the dynamic waveform of the defect.

3. The bridge steel structure weld detection method according to claim 1, characterized in that: the couplant is selected in step S3 in consideration of viscosity, fluidity, adhesion, easy cleaning and the like, and is not corrosive to the surface of the bridge steel structure at the welding seam.

4. The bridge steel structure weld detection method according to claim 1, characterized in that: in the step of S4, an oblique scanning of 45 degrees is added to the electroslag welding seam with respect to the center line of the welding seam.

5. The bridge steel structure weld detection method according to claim 1, characterized in that: when the weld joint is detected in the step S4, the ultrasonic detection instrument should be checked every 4 hours, and the check items are a time base line, a detection sensitivity, and a DAC curve.

6. The bridge steel structure weld detection method according to claim 1, characterized in that: after the defect is detected in step S4, the scanning around the weld bead should be continued.

Technical Field

The invention belongs to the technical field of bridge detection, and particularly relates to a bridge steel structure weld joint detection method.

Background

In the manufacturing of a bridge steel structure, due to the limitation of steel materials, beam sections need to be spliced to form a welding seam in the process of building a bridge, the joint is poor in reliability and is a joint with serious stress concentration, fatigue fracture can be generated under the influence of long-time fatigue stress, and the welding quality and the engineering safety of the bridge are seriously influenced. At present, the quality of the welding line of the bridge steel structure is controlled by a ray detection means, but the position and the height of the defect in the vertical direction are difficult to judge by ray detection, meanwhile, the operation steps are complicated, the efficiency is low, the waste liquid in the film washing process pollutes the environment, radiation protection work must be carried out during field detection operation, and especially, the radiation detection condition is not provided in dense, high-altitude and mountainous areas of downtown personnel. In addition, the ray detection equipment is huge, the operation is inconvenient, the used consumables are more, and the detection cost investment is large.

Disclosure of Invention

The invention mainly solves the technical problem of providing a bridge steel structure weld joint detection method, which can enable the detection of the bridge steel structure weld joint to be more accurate and rapid.

In order to solve the technical problems, the invention adopts a technical scheme that: the method for detecting the welding seam of the bridge steel structure comprises the following steps:

s1: firstly, removing dirt on a position to be detected by a detector, visually observing a welding line by naked eyes, using a magnifying lens of 5-20 times to see whether the defects of undercut, arc pits, welding beading, slag inclusion, cracks, air holes, incomplete welding and the like exist or not if necessary, and checking whether the welding line is smooth and whether welding slag, splashes and the like are cleaned up or not;

s2: the method comprises the following steps that a detection person marks the bridge steel structures needing to be subjected to weld joint ultrasonic detection one by using a mark post, and the detection person marks the bridge steel structures needing to be subjected to weld joint detection and simultaneously marks the bridge steel structures with obvious unqualified appearances as key marks;

s3: selecting a coupling agent with good sound transmission performance, namely a viscous solution of a mixture of carboxymethyl cellulose and tap water, and coating the viscous solution on the welding line of the bridge steel structure to be detected;

s4: according to the characteristics and requirements of the welding seam of the steel box girder, a pulse reflection type ultrasonic detection instrument is adopted to detect the welding seams of the top of the steel box girder, the longitudinal and transverse butt welding seams of the bottom plate, the longitudinal butt welding seam of the web plate, the penetration welding seams between the web plate and the top plate, the bottom plate and the like, the probe scanning speed of the detection instrument is not more than 150mm/s, and at least 10% of the width of a probe wafer should be overlapped in two adjacent scanning;

s5: and (3) evaluating ultrasonic flaw detection defects inside the welding seam according to the defect grade evaluation specified in the technical Specification for highway bridge and culvert construction, and if the defects exceed the standard, issuing a repair notice to a responsible person on the construction site, and rechecking the repaired defect until the defect is qualified.

Further, when scanning is performed in step S4, the probe of the probe apparatus should be moved in a "W" shape with a 10-15 ° swing, and various scanning modes such as front and back, left and right, turning angle, and circling should be added to determine the position, direction, and shape of the defect, observe the dynamic waveform of the defect, and according to the need of the echo signal.

Further, the couplant is selected in step S3 in consideration of viscosity, fluidity, adhesion, easy cleaning, etc., and the couplant is not corrosive to the surface of the bridge steel structure at the weld joint.

Further, in step S4, an oblique scan at 45 ° to the center line of the weld seam should be added to the electroslag weld seam.

Further, when the weld joint is detected in step S4, the ultrasonic detection apparatus should be checked every 4 hours, and the check items are a time base line, a detection sensitivity, and a DAC curve.

Further, after the defect is detected in step S4, the scanning detection should be continued around the weld.

The invention has the beneficial effects that:

the probe scanning speed of the detection instrument is not more than 150mm/s, and the adjacent two scanning processes should be overlapped by at least 10% of the width of the probe wafer, so that the accuracy of bridge steel structure detection is ensured;

according to the invention, visual inspection is firstly carried out on the welding seam, then flaw detection is carried out on the inner part of the welding seam by using an ultrasonic detection instrument, and inspection in various modes can enable the detection result of the welding seam of the bridge steel structure to be more accurate and rapid, and can better reflect the quality of the welding seam of the bridge steel structure.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.

Example (b): a bridge steel structure weld joint detection method comprises the following steps:

s1: firstly, removing dirt on a position to be detected by a detector, visually observing a welding line by naked eyes, using a magnifying lens of 5-20 times to see whether the defects of undercut, arc pits, welding beading, slag inclusion, cracks, air holes, incomplete welding and the like exist or not if necessary, and checking whether the welding line is smooth and whether welding slag, splashes and the like are cleaned up or not;

s2: the method comprises the following steps that a detection person marks the bridge steel structures needing to be subjected to weld joint ultrasonic detection one by using a mark post, and the detection person marks the bridge steel structures needing to be subjected to weld joint detection and simultaneously marks the bridge steel structures with obvious unqualified appearances as key marks;

s3: selecting a coupling agent with good sound transmission performance, namely a viscous solution of a mixture of carboxymethyl cellulose and tap water, and coating the viscous solution on the welding line of the bridge steel structure to be detected;

s4: according to the characteristics and requirements of the welding seam of the steel box girder, a pulse reflection type ultrasonic detection instrument is adopted to detect the welding seams of the top of the steel box girder, the longitudinal and transverse butt welding seams of the bottom plate, the longitudinal butt welding seam of the web plate, the penetration welding seams between the web plate and the top plate, the bottom plate and the like, the probe scanning speed of the detection instrument is not more than 150mm/s, and at least 10% of the width of a probe wafer should be overlapped in two adjacent scanning;

s5: and (3) evaluating ultrasonic flaw detection defects inside the welding seam according to the defect grade evaluation specified in the technical Specification for highway bridge and culvert construction, and if the defects exceed the standard, issuing a repair notice to a responsible person on the construction site, and rechecking the repaired defect until the defect is qualified.

When scanning is performed in step S4, the probe of the probe apparatus should be moved in a "W" shape with a 10-15 ° swing, and various scanning modes such as front and back, left and right, turning angle, and circling should be added according to the need of echo signals in order to determine the position, direction, and shape of the defect and observe the dynamic waveform of the defect.

The couplant is selected in step S3 in consideration of viscosity, fluidity, adhesion, easy cleaning and the like, and is not corrosive to the surface of the bridge steel structure at the welding seam.

In the step of S4, an oblique scanning of 45 degrees is added to the electroslag welding seam with respect to the center line of the welding seam.

When the weld joint is detected in the step S4, the ultrasonic detection instrument should be checked every 4 hours, and the check items are a time base line, a detection sensitivity, and a DAC curve.

After the defect is detected in step S4, the scanning around the weld bead should be continued.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications made by the present invention in the equivalent structure or directly or indirectly applied to other related technical fields are included in the scope of the present invention.