Heat distribution in spot welding, Mechanical Engineering

Assignment Help:

Heat distribution in spot welding

Besides the resistance at the interface, there are six other resistance through which the same welding current is passed. They are:

  1. Resistance of the upper electrode - R1
  2. Resistance of the upper electrode metal contact - R2
  3. Resistance of the top metal - R3
  4. Resistance of the bottom metal - R4
  5. Resistance of the metal - bottom electrode contact - R5
  6. Resistance of the bottom electrode -R6


Therefore, some amount of heat is generated in these regions also (equal to I2 x R x t).

The effective heat that is utilised is that due to the resistance at the metal - metal interface only, the others being losses.

Among the above six resistance, R2 and R5 are high compared to the other four. These two can be minimised by properly choosing the electrode pressure and cleaning the surface well.


Related Discussions:- Heat distribution in spot welding

What do you mean by thermil-welding, What do you mean by Thermil-welding ? ...

What do you mean by Thermil-welding ? Describe the process with neat sketch.

Evaluate young modulus of elasticity - ultimate stress, Evaluate Young modu...

Evaluate Young modulus of elasticity - Ultimate stress: Q:   The following observations were made during tensile test on mild steel specimen 40 mm in diameter and 200 mm long

Governor, when the governor is connected to a engine its sensitiveness form...

when the governor is connected to a engine its sensitiveness formula change,why?

Stress concentrations, Describe the test specimens that were used in the te...

Describe the test specimens that were used in the testing program, and what one hopes to learn by testing them. Show the "test matrix" (i.e. a listing of what specimens made of wh

Compute the centroidal moment of inertia, Compute the centroidal moment of ...

Compute the centroidal moment of inertia: Compute the centroidal moment of inertia of a thin homogeneous bar AB of length l and having a mass of m kg Solution The mass

Explain the back rake angle, Explain the Back Rake Angle It measured th...

Explain the Back Rake Angle It measured the downwards slope of the top surface of the tool from the nose to the rear along the longitudinal axis. Its purpose is to guide the di

What is the density of plastic, Plastics are the common term for a wide ran...

Plastics are the common term for a wide range of synthetic or semi synthetic polymerization products. There are many dissimilar plastics; all have their own density!

Applications of co2 welding, APPLICATIONS OF CO 2 WELDING CO 2 weldin...

APPLICATIONS OF CO 2 WELDING CO 2 welding is extremely useful for joining thin sheets of thickness range 1.0 to 2.0 mm because it is possible to keep the heat input low to av

Surface preparation and coating, Q. Surface Preparation and Coating? Ve...

Q. Surface Preparation and Coating? Vendor shall chemically clean all foreign material and commercially sandblast (SSPC-SP-10) mill scale and rust from all surfaces to be paint

What is injection moulding, Q. What is Injection moulding? An important...

Q. What is Injection moulding? An important industrial method of producing articles of thermoplastics is injection moulding. The moulding material is loaded into a hopper from

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd