How To Detect Welding Defects

The presence of residual stress can cause a crack on the weld metal. A high-frequency sound beam is directed through the weld and the base plate.

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There are many ways to identify weld defects.

How to detect welding defects. An ideal weld or good weld should be such that adequate fusion exists between the filler metal and edge preparation together with good penetration. Poor ductility of the given base metal. To detect welding discontinuities this method is good.

Weld inspectors can measure the depth of undercut the size of the groove the size of the fillet and how concave or convex is a fillet using gages such as these. The rigidity of the joint which makes it difficult to expand or contract the metals. They derive from improper set up or by distortion which should be controlled in a proper fixture or by a different welding sequence.

In general they should be corrected by employing proper means before welding. If there is high content on sulfur and carbon then also the cracks may appear. If a defect travels through the coil an alarm is sounded and the defective material is cut out and scrapped.

Welding defects always appear as a result of specific physical and chemical characteristics of an Mg alloy mainly including oxidation and evaporation overheated coarse grains heat cracks pores and thermal stress and so on713. Welding defects are generated in a welding job due to the faulty or poor technique used by the inexperienced or unskilled welder or due to fundamental difficulties in the welding operation. A welding camera that provides a clear and consistent image of the weld means an operator can reliably detect defects in real time.

We have Specialized Welding camera that takes videos of welding in process but due to intense brightness it is a little difficult to detect black spots in the weld pool which may represent. This compilation of video. At my job we use eddy current coils that the welded material runs through.

DIMENSIONAL Welding-defects can be assessed by visual inspection and by measuring with simple weld gauges. Whenever the beam sound strikes and interruption part of the sound bound back and displayed in the instruments monitor.

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