英文翻译

Activating welding can greatly improve the weld penetration and thus enhance the proce

efficiency and economic benefits.With the further study on activating welding at home and abroad,

it has been applied.But the efficient mechanism of activating welding research is still in the

debate.The efficient mechanism of activating welding was studied by using visualization of arc

and weld pool in this diertation.

The reasonable test scheme and test system was established.A welding line contains the TIG

welding, ATIG welding and laser welding auxiliary activity

results, which will improve the accuracy of the four welding method contrast.A CCD camera

system platform was built by selecting the CCD camera, data acquisition card and the combination

of optical lenses and other devices.The weld pool surface flow pattern video, weld pool video and

arc video was obtained under the specific parameters, which will provide the raw data in theimage information extraction and mechanism analysis.

Multiple areas arc weld pool boundaries and boundary information have been obtained by

proceing arc and weld pool image via MATLAB image proceing module.Because of the

characteristics of the pool image, its boundary extraction procedures has poor adaptability, while

the arc image proceing program has better adaptability

Activating welding has been verified to use the same energy can get greater penetration by

comparing the weld width and penetration.The surface of the weld molten pool flow pattern was

studied, making the initial draw conclusions: Surface flow field direction of TIG welding pool as

the center to the periphery, while the other active welded pool surface flow field direction for the

surrounding to the center.The pool edge of four welding methods for extraction and analysis,

because of the width and length of TIG welding pool are greater than the activity of welding,

making the area much greater.While laser-aisted activity welding pool area is greater than

A-TIG welding and laser-aisted A-TIG welding, the differences in the pool area give rise to the

differences in penetration.The special edge extraction and analysis of four kinds of welding arc,

making a conclusion that: A-TIG welding and laser-aisted A-TIG welding arc electrical

contraction, energy concentration; while TIG welding arc welding and laser-aisted activity

compared large energy spread.

The experimental results show that arc contraction and changes in surface tension are efficient

mechanism of A-TIG welding in the experiment.Efficient mechanism of laser-aisted activity

welding is changes in surface tension, not arc contraction.The efficient mechanism of

Laser-aisted A-TIG welding and A-TIG welding is arc contraction and changes in surface

tension.Arc contraction is caused by activating flux, the changes in surface tension is generated

by a laser-oxygenase-active agents and joint action.The mechanism of activating welding can not

be explained by a single theory, which can be seen from the experimental results.The different

proce will lead to the different mechanism of activating welding.Even as A - TIG welding,

because of the different activating flux formulations, the mechanism will be completely different.