Quality of welds produced by submerged arc welding, Mechanical Engineering

a) You have been assigned to design a robotics spot welding experiment for low carbon steel sheets. You found an experimental power source for spot welding process which is designed to deliver current as a ramp function of time: I = 100,000 t, where I = amp and t = sec. At the end of the power-on time, the current is stopped abruptly. You have decided to use this power source for you experiment. The sheet metal being spot welded is found to have unit melting energy = 10 J/mm3 and resistance R = 85 micro-ohms. The desired weld nugget size is: diameter = 4 mm and thickness = 2 mm (assume a disc-shaped nugget). You assumed that 25% of the energy generated from the power source will be used to form the weld nugget. In order to set up the process, it is required to determine the power-on time the current must be applied in order to perform this spot welding operation. What is the power-on time?

b) Why is the quality of welds produced by submerged arc welding very good?

c) Which materials can be friction stir welded, and which cannot? Explain your answer.

 

d) List the joining methods that would be suitable for a joint that will encounter high stresses and will need to be disassembled several times during the product life, and rank the methods.

Posted Date: 2/21/2013 5:07:43 AM | Location : United States







Related Discussions:- Quality of welds produced by submerged arc welding, Assignment Help, Ask Question on Quality of welds produced by submerged arc welding, Get Answer, Expert's Help, Quality of welds produced by submerged arc welding Discussions

Write discussion on Quality of welds produced by submerged arc welding
Your posts are moderated
Related Questions
Q. Determine the extent of imperfection of the gasket surface? To determine the extent of imperfection of the gasket surface subject to acceptance / rejection, the imperfection

Derive a regression forecasting equation: The general manager of a company producing road rollers is convinced that the demand for road rollers is associated to the number of

Force required to start the roller: A roller shown in the figure given below is of mass 150Kg. What force T is required to start the roller over block A ? Sol.: Let

Copper Alloys Some alloys of copper are employed in industry for varying causes. Copper forms alloys along with zinc or the brasses, tin or the bronzes, along with tin and pho

Calculate the angular acceleration of the pulleys: The compound pulley system has a mass of 30 kg and a radius of gyration of 450 mm. Calculate the tension in each cord and th

Explain the concept of time dilation. Describe experimental verification of time dilation. Explain: (i) Length contraction (ii) Time Dilation in STR What are proper length an

What is solar energy?

Induction Machine Operation For operation with rated L-L voltage of 230 V and rated frequency of 60 Hz, the performance of a particular 10 hp machine at its rated speed and pow

Components of power plant &it''s functions

Find out change in diameter: A cylindrical shell, 0.8 m in a diameter and 3 m long is along with 10 mm wall thickness. If the shell is subjected into an internal pressure of 2