Determination Defect And Mechanical Properties Of Carbon Steel Plate With Different Current Value Using SMAW Process

Mazuri, Mohamed (2015) Determination Defect And Mechanical Properties Of Carbon Steel Plate With Different Current Value Using SMAW Process. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

During manufacturing operation joining carbon steel in joined using several welding technique and joints welding. In every welding there are several factor involve to determine strength of butt joint such as electrode, angle of welding, speed of welding and current. Defect like discontinuities and flaw might occur during welding and it will affect the properties and the performance of the material. The focus of this project is to investigate the defect on butt joint welding on plate using SMAW with different current and to produce a standard procedure for SMAW on butt joint for plate based on the parameter used. In this project, the detection of the crack or discontinuities on the welded sample is done by non-destructive test such as visual inspection (VI), magnetic particle inspection (MPI), liquid penetrant testing (PT), and ultrasonic testing (UT). Visual inspection and liquid penetrant testing is performed to determine defect on the surface of the sample. Liquid penetrant testing method can increase the seeability of small flaw that the human eye might not be able to detect and easy method to use in nonporous surface. Magnetic particle inspection is to detect on the surface and subsurface of the welded sample. In this project used wet magnetic particle method to detect any discontinuities occurs on surface and the subsurface of the sample. Ultrasonic testing is one the Non-destructive testing that used to detect the flaws location inside the weldment based on the pulse echo produce on Cathode Ray Tube (CRT) screen. This project also use mechanical testing on the welded sample to the analysis the effect of welding parameter on mechanical props such as hardness testing, impact testing and bend test. Hardness test is performed to justify the hardness of welded sample by using Rockwell hardness test machine. Lastly, for this project use bend test to measure the ductility and soundness of a welded sample by using bend test machine.

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