CN-122015955-A - Spiral steel pipe detection method

CN122015955ACN 122015955 ACN122015955 ACN 122015955ACN-122015955-A

Abstract

The invention provides a spiral steel pipe detection method, and belongs to the field of steel pipe detection. The method comprises the steps of detecting welding data in real time in a spiral steel pipe welding process, detecting the inner diameter, the outer diameter and the length of the spiral steel pipe after welding, detecting the forming size, the surface defect and the tensile strength of the surface of a welding seam after welding of the spiral steel pipe, detecting the sealing performance of the spiral steel pipe after welding, detecting the thickness, the adhesive force and the surface defect of an anti-corrosion coating after coating of the anti-corrosion coating of the spiral steel pipe, detecting the shock resistance of the spiral steel pipe, detecting the service life of the spiral steel pipe in a step S600, detecting the service life of the spiral steel pipe in a step S700, and detecting the completion of detection in a step S800. The method aims at solving the problem that the detection of the existing spiral steel pipe cannot discover potential internal defects in time. The method has the technical effect that potential internal defects of the spiral steel pipe are found in time.

Inventors

ZHENG YAXUAN
BI JUN
WANG XIN
LI YONGCHAO
HUANG LEI

Assignees

沧州市螺旋钢管集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260128

Claims (10)

1. The spiral steel pipe detection method is characterized by comprising the following steps of: Step S100, detecting a welding process, and detecting welding data in real time in the spiral steel pipe welding process; Step S200, detecting the inner diameter, the outer diameter and the length of the spiral steel pipe after welding; Step S300, detecting welding seams, namely detecting the forming size, surface defects and tensile strength of the surface of the welding seams after the spiral steel pipes are welded; Step S400, detecting tightness, namely detecting the tightness of the welded spiral steel pipe; s500, detecting the anticorrosive coating, namely detecting the thickness, the adhesive force and the surface defects of the anticorrosive coating after the anticorrosive coating of the spiral steel pipe is coated; Step S600, impact resistance detection, namely detecting the impact resistance of the spiral steel pipe; step S700, detecting service life of the spiral steel pipe; step S800, detection is completed.
2. The method for inspecting a coiled steel pipe according to claim 1, wherein the inspecting the welding process of the coiled steel pipe in the step S100 comprises the steps of: step S110, detecting raw materials and welding materials before welding; Step S120, detecting welding equipment before welding; step S130, detecting whether the preheating temperature of the base material reaches the standard or not before welding, and whether the interlayer temperature is kept in a specified range or not during multi-pass welding; step S140, detecting welding voltage, current and welding speed in real time in the welding process; And step S150, detecting the size, shape and weld surface defects of a molten pool in real time in the welding process.
3. The method for inspecting a coiled steel pipe according to claim 1, wherein the step S200 of inspecting the dimensions includes the steps of: Step S210, using an angle grinder or sand paper to remove welding slag and burrs at two end ports of the steel pipe, avoiding the influence of protrusions on the measurement laminating degree, and using a level gauge to calibrate the placement state of the spiral steel pipe; step S220, detecting the inner diameter and the outer diameter of the spiral steel pipe after welding by using a laser calliper; And step S230, detecting the welded length of the spiral steel pipe by using a laser range finder.
4. The method for inspecting a spiral steel pipe according to claim 1, wherein in the step S300, the inspecting of the weld seam, the inspecting of the formed size of the surface of the weld seam after the welding of the spiral steel pipe, comprises the steps of: Step S310, acquiring two-dimensional section data of a welding seam of the spiral steel pipe by using a laser profiler, and dynamically detecting the heights and widths of the welding seam of the inner wall and the welding seam of the outer wall of the spiral steel pipe; And step S320, detecting the straightness of the spiral steel pipe by using a laser collimator.
5. The method for inspecting a spiral steel pipe according to claim 4, wherein the step S300 of inspecting a weld joint includes the steps of: Step S330, an operator moves to the other end along one end of the spiral steel pipe, and visually observes whether weld flash, surface pits and unfilled grooves exist on the surface of the weld joint of the outer wall of the spiral steel pipe; step S340, detecting whether the root of the welding seam of the outer wall of the spiral steel pipe is completely welded or not by using a magnifying glass whether the edge of the welding seam of the outer wall is undercut whether cracks appear at the joint of the outer wall weld joints; And S350, detecting whether welding seams on the inner wall of the spiral steel pipe are in weld flash, surface pits and unfilled grooves or cracks by using an endoscope.
6. The method for inspecting a coiled steel pipe according to claim 1, wherein the step S400 of inspecting the sealing property after the welding of the coiled steel pipe comprises the steps of: step S410, installing plugs at two ends of the spiral steel pipe to ensure that the spiral steel pipe is completely sealed, and installing a safety valve, a water inlet valve and an exhaust valve on the plugs; step S420, detecting welding seams and leakage points of the spiral steel pipe by using a water pressure test method; and S430, detecting the air tightness of the spiral steel pipe by using an air tightness test method.
7. The method for inspecting a spiral steel pipe according to claim 1, wherein the inspecting the anticorrosive coating in step S500, inspecting the thickness, adhesion and surface defects of the anticorrosive coating after the coating of the spiral steel pipe is completed, comprises the steps of: Step S510, observing whether the surface of the anti-corrosion coating is uniform or not, and the anti-corrosion coating has no defects of bubbles, cracks, flaking and the like; step S520, measuring the thickness of the coating by using an ultrasonic thickness gauge; Step S530, quantitatively measuring the bonding strength of the anti-corrosion coating and the spiral steel pipe by using an adhesive force tester; and S540, scanning the surface of the anti-corrosion coating by using an electric spark instrument, and detecting the surface defects of the anti-corrosion coating.
8. The method for detecting a spiral steel pipe according to claim 7, wherein the step S500 of detecting the corrosion-resistant coating further comprises the steps of: Step S550, performing chemical corrosion resistance test detection on the anti-corrosion coating; Step S560, salt spray test, namely detecting the salt spray corrosion resistance of the anti-corrosion coating; Step S570, detecting the anti-aging capacity of the anti-corrosion coating by a temperature and humidity alternating method.
9. The method for detecting the shock resistance of the spiral steel pipe according to claim 1, wherein the step S600 of detecting the shock resistance of the spiral steel pipe comprises the steps of: Step S610, processing a spiral steel pipe pattern into a standard V-shaped notch sample; Step S620, setting an ambient temperature; And S630, using an impact tester, impacting the sample by using a pendulum, and detecting the energy absorbed by the fracture of the spiral steel pipe.
10. The method for detecting a spiral steel pipe according to claim 1, wherein the step S700 of detecting the service life of the spiral steel pipe comprises the steps of: Step S710, detecting the corrosion resistance of the corrosion-resistant coating; Step S720, detecting the mechanical degradation performance of the anti-corrosion coating; and step S730, detecting the material aging performance of the spiral steel pipe.

Description

Spiral steel pipe detection method Technical Field The invention relates to the technical field of steel pipe detection, in particular to a spiral steel pipe detection method. Background The spiral steel pipe is used as a main pipe in the fields of oil gas long-distance pipeline, municipal water supply and drainage pipe network, industrial fluid conveying system and the like, and the quality of the spiral steel pipe determines the long-term operation safety, stability and service life of the conveying system. However, current detection of coiled steel pipes lacks systematic integrated detection capability for all critical links from weld forming to life assessment of coiled steel pipes. The existing spiral steel pipe detection only focuses on static detection after welding, dynamic monitoring of real-time data in the welding process is ignored, potential internal defects caused by fluctuation of a welding process cannot be found in time, although some detection modes cover detection of a sealing property or an anti-corrosion coating, the thickness and adhesive force, impact resistance and actual service life of the anti-corrosion coating are not in cooperative correlation, and corrosion risk caused by coating failure in long-term use or structural stability under extreme working conditions are difficult to predict. In conclusion, the detection of the existing spiral steel pipe has obvious dead zones for controlling the whole quality of the spiral steel pipe, and products with hidden defects are easy to flow into the market. In long-term operation, the hidden defects can be gradually exposed to cause safety accidents such as pipeline leakage and structural fracture, so that not only are economic costs such as conveying medium loss and equipment maintenance caused, but also serious threats to surrounding environment and public safety can be caused. Disclosure of Invention The present invention provides a method for detecting a spiral steel pipe, which is used for solving the above problems in the prior art. The invention provides a spiral steel pipe detection method, which comprises the following steps: Step S100, detecting a welding process, and detecting welding data in real time in the spiral steel pipe welding process; Step S200, detecting the inner diameter, the outer diameter and the length of the spiral steel pipe after welding; Step S300, detecting welding seams, namely detecting the forming size, surface defects and tensile strength of the surface of the welding seams after the spiral steel pipes are welded; Step S400, detecting tightness, namely detecting the tightness of the welded spiral steel pipe; s500, detecting the anticorrosive coating, namely detecting the thickness, the adhesive force and the surface defects of the anticorrosive coating after the anticorrosive coating of the spiral steel pipe is coated; Step S600, impact resistance detection, namely detecting the impact resistance of the spiral steel pipe; step S700, detecting service life of the spiral steel pipe; step S800, detection is completed. In addition, the spiral steel pipe detection method according to the invention can also have the following additional technical characteristics, In some embodiments of the present invention, the spiral steel pipe welding process detection in step S100 includes the steps of: step S110, detecting raw materials and welding materials before welding; Step S120, detecting welding equipment before welding; step S130, detecting whether the preheating temperature of the base material reaches the standard or not before welding, and whether the interlayer temperature is kept in a specified range or not during multi-pass welding; step S140, detecting welding voltage, current and welding speed in real time in the welding process; And step S150, detecting the size, shape and weld surface defects of a molten pool in real time in the welding process. In some embodiments of the present invention, in step S200, the size detection, detecting the inner diameter, the outer diameter and the length of the welded spiral steel pipe includes the steps of: Step S210, using an angle grinder or sand paper to remove welding slag and burrs at two end ports of the steel pipe, avoiding the influence of protrusions on the measurement laminating degree, and using a level gauge to calibrate the placement state of the spiral steel pipe; step S220, detecting the inner diameter and the outer diameter of the spiral steel pipe after welding by using a laser calliper; And step S230, detecting the welded length of the spiral steel pipe by using a laser range finder. In some embodiments of the present invention, in step S300, the detecting of the weld seam after the welding of the spiral steel pipe, detecting the forming size of the weld seam surface includes the steps of: Step S310, acquiring two-dimensional section data of a welding seam of the spiral steel pipe by using a laser profiler, and dynamically detecting the heights and widths