An Investigation Of Defects On Butt Joint Of Different Welding Technique Using Ultrasonic Method

Mohd Audi Aizat, Mohd Zim (2012) An Investigation Of Defects On Butt Joint Of Different Welding Technique Using Ultrasonic Method. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The focus of this project is to detect and localize the defect or discontinuities inside the welded joint on a dual phase steel sample specimen by using a Non Destructive Method (NDT) which is Ultrasonic Testing (UT). In this project, 4 pieces of heat treated steel plate is joined together by butt joint on shielded metal arc welding process(SMAW) and combined tungsten inert gas welding technique(TIGC) into two specimen. Both specimens is marked as plate C1 and C2 respectively. The welding process is done by experienced welder in order to get a good weldment piece. The inspection of the weldment using ultrasonic testing take place after all the welding process is finished. The UT process start with the probe calibration where the probe is calibrated with V1 and V2 calibration block before goes to the plate inspection. There are three types of angle probe which are 45˚, 60˚, 70˚, but for this project the 70˚ of angle probe is used to identify and locate the defect inside the welded area on plate specimen. The result obtained from the ultrasonic testing is then compared with the radiographic testing technique to check the reliability of the ultrasonic testing on the plate. Finally, in the result and discussion chapter discuss about the result gathered for both ultrasonic testing and radiographic testing.

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