Lab #6 Write Up

Lab #6 Write Up - M E 324 Lab #6 Welding Lab 4/27/2011...

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ME 324 Lab #6 Welding Lab 4/27/2011 Group 1 Section 6 Justin Allen, Kyle Zibrowski, Matt Montalbano, Vishal Bakshi, Wenbin Chen, Muhammad Amir
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Contents Executive Summary The purpose of this lab is to determine the overall quality of different welding processes. Welding is just one of many ways to join two pieces of metal together using heat to form a strong, permanent joint. In this lab, the groups will be testing three different types of welding processes. These processes are MIG, TIG, and SMAG or “stick” welding. The groups will be testing the welds on three different types of material samples. These materials are 1020 steel, stainless steel, and aluminum. Each specimen is a standard bar specimen with the nominal dimensions of 3”x1”x.125”. The lab begins with the laboratory technician performing various types of welds using an outdated Oxy- Acetylene torch and three different types of arc welders. Next the mechanical testing of the welded joints is carried out by performing two different tests. A Satec tension test is used to test the ultimate tensile strength of the welds, while a Rockwell hardness test is preformed on both the unwelded and welded surfaces of each sample. Conclusion of 2
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the welding quality can be drawn from the results of these tests. The results showed that both TIG and MIG welding are both excellent choices for welding materials. They form a stronger bond between the two metals that are being joined. However, TIG welding formed a much harder bond than MIG welding. The test showed that stick welding did not perform as well as the others types of welding. It did not return a high strength or hardness value. It also does not look as aesthetically pleasing. The lab also showed that Oxy-Acetylene torch welding is not a viable method of welding any more since inert gas arc welding out performs it in every way. All three types of arc welding are still used today for different purposes. Introduction The purpose of this lab is to practice different types of welding process and observe how each different processes affects the strength of the welded joint. The lab also help improve understanding of welding and shop safe practices during welding process, learn how to test and evaluate the strength of welded joint and improve understanding of weld quality and failure mode of welded joint. The first part of the lab is to prepare seven samples using different welding operations. Welding equipment used in this lab are Oxy-Acetylene welder, Lincoln AC/DC Arc welder, Miller constant potential arc welder, Lincoln square wave TIG 175 welder with argon gas and Lincoln IDEALARC DC-600 SAW welder. The second part of the lab is to inspect the tensile stress and the strength of each sample using Satec model 24GBN material testing machine for tensile test and Wilson/ Rockwell Hardness Tester Series 514R/524T to inspect the hardness of the welded samples. Knowing the quality of each specimen for the different welding process is import to determine which process can be used for different specimen to ensure that the
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Lab #6 Write Up - M E 324 Lab #6 Welding Lab 4/27/2011...

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