Perforated tubing has quite a lot of finish consumer markets, significantly with functions within the automotive business the place they’re mostly utilized in exhaust and filtration assemblies. The tubing begins out as a coil strip pre-perforated with holes that may have virtually any perforation form, sample, or gap dimension. The perforated coil strip is often made by punch press on a separate course of after which delivered to the mill for forming right into a tube.
An in depth-up view of a perforated tube. Picture courtesy of www.perforated-tube.com
When such perforated materials is fashioned right into a tube, it typically can’t be examined utilizing conventional Ultrasonic or Eddy present processes as they often require a strong materials to transmit the sign and create an acceptable sign “signature” that may be analyzed for defects. Within the case of both testing approach, the check transducer sends sound or electrical present by the fabric to be examined. If the fabric is strong and free from defects, the sound waves or electrical present will go by the fabric. Within the case of a perforate tube, the sound waves or electrical present will hit the perforations, bounce off them and inflicting an unpredictable end result, rendering the check process ineffective.
As a substitute, utilizing a non-contact laser triangulation methodology to optically measure the geometric profile of the weld bead and the forming of the tube is the one strong answer for making a few of these measurements. Techniques such because the Xiris WI-2200 use a laser and will be set-up to simply detect variations within the weld bead profile and/or type of the tube, all whereas ignoring the presence of perforations within the father or mother materials of the tube.
Instance of tube defects that laser weld inspection techniques such because the WI-2200 can establish.
High: Deflection, Backside: Mismatch
Similar to non-perforated tube inspection, defects that may be detected by the laser triangulation system for perforated tube embody extreme or sunken bead peak, mismatch, deflection, undercut, freeze line and others. To be taught extra about every of those defects, go to our defect detection weblog collection, the place we talk about varied profile defects equivalent to scarf width, deflection, and measurements associated to the weld bead.
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