DESIGN AND FABRICATION OF JIG TO HOLD METALLOGRAPHIC SPECIMEN

Abstract

A welding thickness testing is one method to determine the dimension of nugget diameter of weld interior quality invisible to the naked eye. The quality of position and diameter weld measurement is clarified by the thickness of Toyota Engineering Standard (TES) which is included Spot Weld and Arc Weld. Thus during the inspection of the welding thickness test, metallographic specimen need to be prepared for the sample of inspection under microscopic vision. Besides, the preparation of the specimen have several procedure which is one of it is grinding/ polishing the specimen will be selected as the priority analysis in this research. Moreover, the current method use for grinding/ polishing metallographic specimen is hold the sample with bare hand during grinding process. Due to this issue, the previous method also take a lot of time when the person need to make sure the specimen is grinding nicely to get the clear vision under microscopic inspection and produce small amount of finish sample at the end of the grinding/ polishing process. This project is about to design and fabricate jig for holding the metallographic specimen during the grinding process. The jig is implemented to be design and fabricate to overcome the current issue during grinding/ polishing process. Besides, the holding jig concept design is developed using CATIA V5 software, specifically limit to design the conceptual jig and fabricate to overcome the problem in this research. The best design will be choose to fabricate the jig in this research using the PUGH method and the second design has come out with high merit compare to other design. Last but not least, the results and evaluation of the cycle time from the previous method and after implement the jig of the metallographic sampling will be compared and discuss.