Please Choose Your Language
You are here: Home / Blogs / What Is The Welding Seam Flaw Detection And Working Principle ?

What Is The Welding Seam Flaw Detection And Working Principle ?

Views: 0     Author: Site Editor     Publish Time: 2021-11-01      Origin: Site


Weld flaw detection is to detect cracks or defects in metal materials or components in the welding machine process. Commonly used flaw detection methods are: X-ray flaw detection, ultrasonic flaw detection, magnetic particle flaw detection, penetrant flaw detection, eddy current flaw detection, gamma ray flaw detection and other methods. Physical testing is to perform non-destructive testing without chemical changes.


Physical testing is to perform non-destructive testing without chemical changes. Portable ultrasonic weld defect detector, it can quickly, conveniently, without damage, and accurately detect, locate, evaluate and diagnose various defects (cracks, inclusions, pores, incomplete penetration, incomplete fusion, etc.) inside the workpiece.


It is used not only in the laboratory, but also in the engineering site inspection. It is widely used in welding seam inspection in the manufacture of boiler and pressure vessel, welding seam quality assessment in engineering machinery manufacturing, iron and steel metallurgy, steel structure manufacturing, shipbuilding, oil and gas equipment manufacturing and other fields that require defect detection and quality control.


For some precision stainless steel welded pipes used in specific fields, customers will require us to equip their ordered stainless steel industrial tube making machinery with non-destructive testing equipment. In order to meet the needs of customers, Hangao Tech (SEKO Machinery) will customize according to the scope of pipe manufacturing proposed by customers. The common ones are eddy current flaw detectors, but there are also customers who require ultrasonic flaw detectors or laser detection.

Flaw detection inspection scope :

1. Inspection of weld surface defects. Check the welding quality of weld surface cracks, lack of penetration and weld leakage.

2. Inner cavity inspection. Check surface cracks, peeling, pull lines, scratches, pits, bumps, spots, corrosion and other defects.

3. Status check. When certain products (such as worm gear pumps, engines, etc.) work, perform endoscopic inspections according to the items specified in the technical requirements.

4. Assembly inspection. When there are requirements and needs, use the Yatai Optoelectronics Industrial Video Endoscope to check the assembly quality; after the assembly or a certain process is completed, check whether the assembly position of each component meets the requirements of the drawing or technical conditions; whether there are assembly defects.

5. Surplus inspection. Check the residual internal crumbs and foreign objects in the inner cavity of the product.


Basic principles of ultrasonic flaw detection :

Ultrasonic flaw detection is a method that uses ultrasonic energy to penetrate deep into the metal material, and when one section enters another section, the characteristics of reflection at the edge of the interface are used to check the defects of the part. When the ultrasonic beam passes from the surface of the part to the probe Inside the metal, when it encounters a defect and the bottom surface of the part, a reflected wave is generated separately, forming a pulse waveform on the phosphor screen, and the position and size of the defect are judged based on these pulse waveforms.

Advantages and disadvantages :

Compared with X-ray flaw detection, ultrasonic flaw detection has the advantages of higher flaw detection sensitivity, short cycle, low cost, flexibility and convenience, high efficiency, and harmless to the human body.


The disadvantage is that it requires a smooth working surface and requires experienced inspectors to distinguish the types of defects, and there is no intuitiveness to defects; ultrasonic flaw detection is suitable for inspection of parts with a large thickness .

Related Products

Every time the finishing tube is rolled, it must go through the process of solution treatment. Ta ensure that the performance of the steel pipe meets the technical requirements. and to provide guarantee for the post-process processing or use. Bright solution treatment process of ultra-long seamless steel pipe has always been a difficulty in the industry.

Traditional electric furnace equipment is large,covers a large area, has high energy consumption and large gas consumption, so it is difficult for realize bright solution process. After years of hard work and innovative development, the use of current advanced induction heating technology and DSP power supply. Precision control of heating temperature to ensure that the temperature is controlled within t2C,to solve the technical problem of inaccurate induction heating temperature control. The heated steel pipe is cooled by "heat conduction"in a special closed cooling tunnel, which greatly reduces the gas consumption and is more environmentally friendly.
$ 0
$ 0
Explore the versatility of Hangao's Stainless Steel Coil Tube Production Line. Tailored for various applications, from industrial processes to specialized manufacturing, our production line guarantees the seamless fabrication of high-quality stainless steel coil tubes. With precision as our hallmark, Hangao is your trusted partner for meeting diverse industry requirements with excellence.
$ 0
$ 0
Embark on a journey of hygiene and precision with Hangao's Stainless Steel Fluid Tube Production Line. Tailored for sanitary applications in pharmaceuticals, food processing, and more, our cutting-edge machinery ensures the highest standards of cleanliness. As a testament to our commitment, Hangao stands out as a manufacturer where tube production machines boast exceptional cleanliness, meeting the stringent requirements of industries that prioritize purity in fluid handling systems.
$ 0
$ 0
Explore the myriad applications of titanium tubes with Hangao's Titanium Welded Tube Production Line. Titanium tubes find critical utility in aerospace, medical devices, chemical processing, and more, owing to their exceptional corrosion resistance and strength-to-weight ratio. As a rarity in the domestic market, Hangao takes pride in being a stable and reliable manufacturer for titanium welded tube production lines, ensuring precision and consistent performance in this specialized field.
$ 0
$ 0
Dive into the realm of precision with Hangao's Petroleum and Chemical Tube Production Line. Crafted for the rigorous demands of the petroleum and chemical industries, our production line excels in manufacturing tubes that meet the stringent standards required for transporting and processing crucial materials in these sectors. Trust Hangao for reliable solutions that uphold the integrity and efficiency vital to petroleum and chemical applications.
$ 0
$ 0
Experience the epitome of technological advancement with Hangao's Laser Stainless Steel Welded Tube Production Line. Boasting accelerated production speeds and unparalleled weld seam quality, this high-tech marvel redefines stainless steel tube manufacturing. Elevate your production efficiency with laser technology, ensuring precision and excellence at every weld.
$ 0
$ 0

If Our Product Is What You Want

Please get in touch with our team immediately to answer you with a more professional solution
Tel: +86-139-2821-9289 
Add: No. 23 Gaoyan Road, Duyang Town, Yun 'anDistrictYunfu City. Guangdong Province

Quick Links

About Us

Login & Register

Guangdong Hangao Technology Co., Ltd. is China's only one with high-end precision industrial welded pipe production line full set of equipment manufacturing capabilities.
Leave a Message
Contact Us
Copyright © 2023 Guangdong Hangao Technology Co., Ltd. All Rights Reserved. Support by | Sitemap. Privacy Policy