Common Flaw Detection Methods For Welded Pipes

Common Flaw Detection Methods For Welded Pipes
Common Flaw Detection Methods For Welded Pipes

Common Flaw Detection Methods For Welded Pipes

In the process of manufacturing and using welded pipe, nondestructive testing to ensure weld quality is particularly important.

The common nondestructive testing methods for welded pipes are: ultrasonic testing, off-line magnetic flux leakage testing and eddy current testing;
Ultrasonic flaw detection for the whole body of welded pipe
Ultrasonic flaw detection of welded pipe is mainly divided into direct contact method and liquid immersion method.
Direct contact method has the advantages of convenient operation, simple flaw detection graphics, easy judgment and high defect detection sensitivity. It is the most used method in actual flaw detection.
The method of immersing ultrasonic probe and workpiece in liquid and using liquid as coupling agent for flaw detection is called liquid immersion method. The coupling agent can be oil or water. This method is applicable to the specimen with rough surface. The probe is not easy to wear, the coupling is stable, and the detection results have good repeatability, which is convenient to realize automatic flaw detection.

Common Flaw Detection Methods For Welded Pipes

Ultrasonic flaw detection of welded pipe welds
1) Off line flaw detection of welds
The welded pipe is sent to the flaw detection area from the transfer roller table, the rotating idler is raised, and the steel pipe weld is manually rotated to a certain point of the weld on the idler.
When the flaw detection trolley runs, each group of probes fall on the welded pipe in sequence. The coupling agent for flaw detection is the emulsion of the welded pipe production line, which receives the sensing signal and automatically sprays on the weld and both sides.
Because the ultrasonic off-line system is arranged after water cooling and air cooling, the influence of weld deviation becomes very important. Therefore, in the off-line flaw detection of weld, two groups of 6 probes in total are used for the detection of longitudinal linear defects of welded pipe weld, with 3 probes in each group, distributed on both sides of the weld, two-way detection, occupying 6 channels in total, and normal flaw detection can be carried out within 15mm of weld torsion (deviation).

Common Flaw Detection Methods For Welded Pipes

2) Manual flaw detection of welds
The strict judgment of defects detected by off-line weld flaw detection needs to be confirmed by manual flaw detection.
Visual inspection shall be carried out on the weld and flaw detection surface before manual retest confirmation. The appearance quality shall meet the provisions of relevant standards. The shape of both sides of the weld and flaw detection surface shall not affect the detection of defects, otherwise grinding shall be carried out; The flaw detection inspector must check the testing equipment, whether the position and direction of the instrument are correct, and whether the coupling agent and testing joint are correct.

Common Flaw Detection Methods For Welded Pipes

Before manual retest, the flaw detection equipment shall be verified. After the first verification, the second verification shall be carried out every 3 ~ 4H. At the end of the detection, the flaw detection equipment shall be verified again.

After the weld position is aligned, apply coupling agent (emulsion) on both sides of the weld for formal flaw detection; For the steel pipes that fail to pass the weld flaw detection, mark the defective parts and make detailed records.

Stainless Steel Pipe/Tube Products:


MTSCO – Austenitic / Duplex steel / Nickel alloy

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MTSCO established in 2006, during many years development, nowbecomes a large and professional industrial piping system provider, serving customers from more than 100 countries and regions.

MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy

What products can we provide?

MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy
MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy

What materials can we provide?

Austenitic

304/L/H/N, 316/L/H/N/Ti, 321/H, 309/H, 310S, 347/H, 317/L904L

Duplex steel

31803, 32205, 32750, 32760

Nickel alloy

Alloy B/ N10001, Alloy B2/N10665, Alloy B3/N10675, Alloy C4/N06455, Alloy C22/N06022, Alloy C276/N10276, Alloy C2000/N06200, Alloy G35/N06035, Alloy G30/N06030,
Alloy S/N06635, Alloy N/N10003, Alloy X/N06002, Alloy 188/R30188, Alloy 230/N06230,
Alloy 556/R30556, Alloy 600/ N06600, Alloy 601/N06601, Alloy 617/N06617,
Alloy 625/N06625, Alloy 718/N07718, Alloy X750/N07750, Alloy 800/N08800,
Alloy 800H/N08810, Alloy 800HT/N08811, Alloy 825/N08825, Alloy 925/N09925,
Alloy 926/N08926, Alloy 400/ N04400, Alloy K500/N05500
Precipitation-hardening Steels: 254SMO/S31254, 17-4PH, 17-7PH, 15-7PH
Nickel: N4/UNS N02201, N6/UNS N02200

How can MTSCO service customers?

MTSCO’s ISO9001 Quality System is issued by TUV. Our full and professional inspection reports contain two parts, one is self-inspection of the requirements beyond ISO9001, which is 100% inspected by our own QC; another is 100% inspected by professional QC teams.

MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy

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