UPSET WELDING
Upset welding (UW) is a welding process which makes use of the resistance offered by the two metals, which are to be joined, to electricity and thus helping the metals to be fused along the butt joint or over the area in which we should make the fusion. Pressure is applied to the joint in such a way that it’s application will enhance the welding process. An upset weld (source: Jefferson welding Encyclopaedia 18 Edition)
PRINCIPLE:
The welding process takes place in the solid state of both the metals that are to be joined. The input that is given is resistance heating to the metal at the joint. The heating is provided in such a way that the metal reaches its recrystallization temperature wherein the crystal structures of the
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The workpieces which are to be joined are fixed on the machine such that the fay surfaces touch each other.
2. Parts are to be clamped
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Current is provided by a resistance welding transformer. This transformer converts normal line power to high power current. No-load secondary voltages required ranges from about 0.4 to 8 V. The upset force applied can either be controlled automatically using pneumatics or manually by applying mechanically or hydraulically the required force.
ADVANTAGES DISADVANTAGES
• Fast process when compared to other welding processes.
• Can be used for any alloy which are difficult to weld using normal methods
• Have higher strength welds
• Due to non-melting process, properties of the base material are not altered.
• Can be used for joining very large structures to thin wires. • Permanent deformation on the welded body
• Initial setup cost is high
• Requires very high power supply on a continuous basis
APPLICATIONS:
• Used mainly in wire manufacturing industries.
• Used in joining bars, tubes etc. in industries so as to obtain the required length.
• Used in large structural fabricating industries.
• Used to join capsules, vessels, cylinders
"Welding Processes, Welding Faults, Defects & Discontinuities For NDT Technicians Part 3." Hera.org. Hera, n.d. Web. 15 Mar. 2014. .
Thomas Jefferson said, “I find that the harder I work, the less I call it work”. I have often found myself in situations where I needed to fix something but could not because it is metal. I believe this might be why I began to show interest in welding. There is great satisfaction in being able to create or fix a metal object on your own. As a Certified Welder, I will be able to combine my hardworking drive with my personal interest in metal working to be a successful welder. This paper will explore the job description, requirements, and salary expectation for a Certified Welder.
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"Purchasing Your First Robotic Welding System | Lincoln Electric."Lincolnelectric. N.p., n.d. Web. 08 May 2014.
A tool for opening paint cans. Sometimes used to convert common slotted screws into non-removable screws.
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were used in nature and strong and weak were used in quality. In the procedure
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A means to adjust the center distance between the hob and work piece for different size work pieces and hobs
?Automation Reduces Weld Spatter? Welding Design & Fabrication (Jun. 2001): 37 EBSCOhost. Online. Nov. 2002 .
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used to make products such as plastic lumber, toys, containers, carpet, fiber fill for jackets