Are you familiar with the four most suitable nondestructive testing methods for steel castings?

Release Date:

2021/07/30

Nondestructive testing is the examination of castings to detect surface or internal defects without causing any damage to the material; it is also referred to as nondestructive flaw detection. Numerous testing methods are available for nondestructive flaw detection, with the following four being widely used in production: magnetic particle inspection, ultrasonic testing, radiographic testing, and liquid penetrant testing.

1. Magnetic Particle Testing

When ferromagnetic materials such as steel are subjected to a strong electric current or placed in a magnetic field, they become magnetized. At surface defects—such as cracks and inclusions—magnetic flux lines have difficulty penetrating; instead, they are forced to bypass these defects, leaking out near the surface and thereby forming localized magnetic poles.

2. Ultrasonic Testing

In a broad sense, ultrasonic flaw detection refers to the method of using ultrasonic vibrations to identify defects in materials or workpieces. Depending on the modulation technique, ultrasonic vibrations may be continuous—producing continuous waves—or pulsed—producing pulse waves. Although the underlying operating principles are broadly similar, the inspection methods differ; ultrasonic flaw detection can be categorized into three techniques: the transmission method, the resonance method, and the reflection method.

3. Radiographic Testing

The method of radiographic or fluoroscopic inspection using X-rays and gamma rays to detect macroscopic defects in finished or semi-finished products is known as radiographic testing. X-rays and gamma rays can penetrate materials that are opaque to visible light; moreover, they induce photochemical reactions, ionization, and fluorescence in certain substances. Furthermore, the intensity of all these effects increases with the intensity of the radiation.

4. Liquid Penetrant Testing

This is a method for detecting surface defects. It involves applying a penetrant to the cleaned surface of the workpiece, allowing it to seep into open defects; the excess penetrant on the surface is then removed, followed by the application of a developer. Due to capillary action, the developer draws out the residual penetrant from the defects, thereby revealing the defects.

Luoyang Weicheng Engineering Testing Co., Ltd. Visits Frontline Personnel Engaged in Epidemic Prevention and Control

Our company has successfully passed the surveillance audit for the AS9100D Aerospace Quality Management System.

Luoyang Weicheng Engineering Testing Co., Ltd. Visits Frontline Personnel Engaged in Epidemic Prevention and Control

Our company has successfully passed the surveillance audit for the AS9100D Aerospace Quality Management System.

To further carry forward the spirit of Lei Feng and promote the volunteer ethos of “dedication, friendship, mutual assistance, and progress,” in accordance with the spirit of the Henan Provincial Association for Science and Technology’s “Notice on Launching a Centralized ‘i-Science Popularization’ Science and Technology Volunteer Service Campaign in the Spirit of Lei Feng,” Luoyang Weicheng Engineering Testing Co., Ltd. responded enthusiastically to the call and organized a science popularization event on the safe operation of forklifts. On March 4, our company meticulously planned and conducted an emergency response drill for special equipment—forklift accidents—and invited several nearby companies that use forklifts to observe the exercise. The purpose of this drill was to simulate real-world working conditions, specifically the sudden occurrence of an accident during the process of using a forklift to handle goods.

2024-03-05

The 10th Anniversary Gratitude Celebration of Luoyang Weicheng Engineering Testing Co., Ltd. Concludes Successfully

On the afternoon of December 29, 2023, Weicheng Testing Co., Ltd. held a grand gratitude celebration—“Our Ten Years”—inviting distinguished guests, including Mr. Jia Hong, Director and Vice Chairman of the Titanium-Zirconium Industry Development and Application Center of the China Equipment Management Association, as well as Mr. Lu Fusheng, Executive Deputy Director, Vice Chairman, and Secretary-General, along with clients and partners, to jointly witness this milestone occasion. The first segment of the event: A Decade of Development The event officially commenced at 2:00 p.m., with the company welcoming all attendees

2024-01-11

In 2023, Luoyang Weicheng Engineering Testing Co., Ltd. Successfully Held the “Intensive Training and Competition” — Gamma-Ray Radiographic Inspection Emergency Drill

On October 11, Luoyang Weicheng Engineering Testing Co., Ltd. held a large-scale training and competition—specifically, a γ-ray radiographic inspection radiation emergency response drill—under the theme “Everyone Talks About Safety, Everyone Knows How to Respond to Emergencies.” The event invited leaders from the provincial, municipal, and district levels to attend and observe. Prior to the start of the emergency response drill, Cui Songbiao, General Manager of Luoyang Weicheng Engineering Testing Co., Ltd., and Gong Aifeng, Deputy General Manager, extended a warm welcome to the visiting provincial, municipal, and district leaders and pledged that Weicheng Testing would consistently focus on enhancing its professional technical expertise and emergency response capabilities as key drivers for corporate safety management.

2023-10-19

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