Effect of parameters in flash butt welding, Mechanical Engineering

Assignment Help:

Effect of parameters in flash butt welding


Flashing Feed Rate: If excessive, there is a probability of the parts freezing together without welding. If this is insufficient, intermittent flashing will occur resulting in insufficient heating in the material.

Flashing Time
: If excessive, the material becomes too plastic to upset properly. If this time is less, the plasticity attained is not sufficient.

Flashing Current: If this is more than required, excessive flash is found in the weld : deep craters are formed causing pockets and inclusions in weld. If ot herwise, there is a tendency for the materials to freeze; lack of plasticity is also caused.

Upsetting Current: Too much of this parameter, causes burning or oxidation of the material even to the extent of blowing out metal. Excessive deformation also results. On the contrary, too less of upsetting current results in longitudinal cracking through weld area; inclusions and voids are not properly forced out of weld.

Upsetting Force: Excess of upsetting force causes the flow lines of the material to bend perpendicular to the welded job axis. As a consequence, poor weld results in. If upsetting force is inadequate, oxides, inclusions and voids can be found in the weld; cast metal may be retained in the weld.


Related Discussions:- Effect of parameters in flash butt welding

Discover ratio of the torsional strengths, Discover ratio of the torsional ...

Discover ratio of the torsional strengths: A hollow shaft of inner diameter is 1/2 × the outer diameter & a solid shaft of diameter is the external diameter of the hollow shaf

Types of culverts - causeway and bridges, Types of Culverts: Culverts ...

Types of Culverts: Culverts are constructed with various materials and to different designs. The popular forms are : (a) Temporary stone scuppers (b) Stone slab culverts

Determine product data exchange specifications, Product Data Exchange Speci...

Product Data Exchange Specifications (PDES) By 1984, many of these international efforts had produced enough results to be compared, and an international community was preparin

Evaluate the stresses in the rod, A steel tube of 30 mm external diameter a...

A steel tube of 30 mm external diameter and 20mm internal diameter encloses a copper rod of 15mm diameter to which it is rigidly joined at each end. If at a temperature of 10 o C,

Energy method, A semi circular frame of flexural rigidity EI is built at A ...

A semi circular frame of flexural rigidity EI is built at A and caries a vertical load W at B. calculate the magnitude of the vertical and horizontal deflection at B and hence the

Nature of shear force and bending moment - load variation, Define the natur...

Define the nature of shear force and bending moment under load variation. Sol.: The nature of SF and BM variation under two-load region is given in the table below

Titanium alloys, Titanium Alloys Pure titanium is a light weight and s...

Titanium Alloys Pure titanium is a light weight and strong ductile metal. This is very strong and as well as highly resistant to corrosion of all kinds but has the drawback su

Heat loss in acylindrical pipe, Ask question #Minimum 1. Research the topic...

Ask question #Minimum 1. Research the topic of heat loss in a cylindrical pipe. Explain which laws of physics are used to discuss heat loss in a pipe, and briefly explain how the f

Define edge joints, Edge joints: The flanged edge joint is suit- able for p...

Edge joints: The flanged edge joint is suit- able for plate 1/4 inch or less in thickness and can only sustain light loads. Edge preparation for this joint may be done.

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