Electric arc stud welding waveform detection device and quality evaluation method thereof

Abstract

The invention discloses an electric arc stud welding waveform testing device and a quality evaluating method thereof. The electric arc stud welding waveform testing device implements waveform processing to electric current signals through a hardware waveform processing system and a software waveform processing system in the stud welding process, obtains the electric current waveform in the stud welding process, further obtains five quality parameters including arc generating time, an average value of electric arc burning currents, a fluctuating range of the electric arc burning currents, arc burning time and an instantaneous electric current value before arc blowout, contrasts the five quality parameters with standard waveform parameters, and consequently gives quick quality evaluation of finished welding. The quality evaluating method is a nondestructive and real-time test method, prevents a good welding adapter from being damaged in detection, can realize the 100 percent detection of the stud welding adapter, overcomes the detection omission problem that is caused by the fact that only 2 to 5 percent of the stud welding adapters are randomly inspected in traditional methods, and can simultaneously realize the detection with inner defects such as air holes and incomplete fusion and the like which are hard to be realized by the traditional appearance test methods.

Description

technical field [0001] The invention belongs to the field of arc stud welding, and relates to a detection device, in particular to an arc stud welding waveform detection device and a quality evaluation method thereof. Background technique [0002] Since American Nelson engineers invented the stud welding technology in manufacturing warships, the stud welding process has expanded from a single shipbuilding industry to automobiles, locomotive rail transit, boiler pressure vessels, power stations, steel structures, building bridges, decorative curtain walls, cabinets, Jewelry making, sign making, home appliances, cooking utensils, sheet metal processing and food machinery and many other industries. Stud welding technology has developed to this day and has become a basic thermal processing method in western developed countries. About 80% of the welding of studs (welding studs) is completed by stud welding machines. Since the introduction of arc stud welding technology in my cou...

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Problems solved by technology

[0008] The existing stud welding quality detection and evaluation methods are typical post-weld detection methods, which cannot detect and evaluate the welding quality in real time during the welding process, so it is difficult to take timely remedial measures

Moreover, the existing bending inspection method is a destructive inspection method, and after the inspection, no matter whether the quality is good or bad, welding must be carried out again.

[0009] In the process of engineering application, the appearance inspection of stud welding quality is a superficial inspection method. Whether there are defects inside the weld and whether the strength meets the requirements of the welding design cannot be directly observed in some cases; and Bending inspection is also a destructive inspection method. After welding, 2 to 5% of the studs that have been welded need to be destroyed for inspection. In this way, it is suitable for medium and large projects with tens of thousands or hundreds of thousands of screws in China. In other words, the workload of testing has increased greatly, the waste of screws is serious, and the progress of the project has been slowed down. The resulting waste and increased project cost are inestimable.

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