Weld preparation-joint tolerance-cleaning, Mechanical Engineering

Assignment Help:

WELD PREPARATION: Joint Tolerance & Cleaning

 

Joint Tolerance


The allowable tolerance of joint dimensions depends upon whether the welding is to be done manually or by mechanised means. Manual welding applications can tolerate greater irregularities in joint fit up than mechanised welding. The particulartolerance of a given application can be determined only by actual testing, and this tolerance should be specified for future work.


Cleaning


Cleanliness of both the weld joint areas and the filler metal is an important consideration when welding with the gas tungsten arc process. Oil, marking crayon,grease, shop dirt, paint,  & rust or corrosion deposits all must be removed from the joint edges and metal surfaces, to a distance beyond the heat affected area. Their presence during welding might  lead toarc instability and contaminated welds containing pores, cracks and inclusions. Cleaning may be accomplished by mechanical means, by the use of vapour or liquid cleaners, or by a combination of these. Organic solvents like carbon tetrachloride should not be used as any trace of it coming under the arc may lead to the formation of phosgene, a toxic gas. Acetone may be used. 


Related Discussions:- Weld preparation-joint tolerance-cleaning

What do you know about direct welds, Q. What do you know about Direct welds...

Q. What do you know about Direct welds? It is a welding method in which one or more electrodes oppose each other, contacting both sides of the work and with the current passing

Corrosion resistance of zirconium, Q. Corrosion resistance of Zirconium? ...

Q. Corrosion resistance of Zirconium? Zirconium offers excellent corrosion resistance to most oxidizing and reducing acids and virtually all alkalis. However, it is not resist

Two UVL loads on a beam, Hi there. I am stuck on a problem. I am working ...

Hi there. I am stuck on a problem. I am working out the section of 2 beams for the floor of an elevator. Thus far the critical conditions are made up of a beam that is 1.8m long

Advantages of casting process, Advantages of Casting Process: Electri...

Advantages of Casting Process: Electric Furnace : The melting of steel by electric furnaces developed rapidly for the availability of cheap electric power. Electricity is us

Illustrate governing mechanism of francis turbine, (a) Illustrate governing...

(a) Illustrate governing Mechanism of Francis turbine. (b) Derive a mathematical expression for work done and efficiency of Francis runner. (c) Write differences between Kapl

What is the difference between mis and erp, MIS MIS:- Management Infor...

MIS MIS:- Management Information System Produces reports on user demand MIS is use for the Decision making reports It Collect data form of all department then produce

Compute the concentration of li, Aluminum-lithium alloys have been develope...

Aluminum-lithium alloys have been developed by the aircraft industry to reduce the weight and improve the performance of its aircraft. A commercial aircraft skin material having a

Metal that does not contain iron, Is there a metal that does not contain ir...

Is there a metal that does not contain iron? Ans) Most commercially available aluminum having some other materials, but only accidental traces of iron, if any. For example, Copp

#totto cycleitle.., for an otto cycle, compression ratio=8.5:1,air inlet=15...

for an otto cycle, compression ratio=8.5:1,air inlet=15degree celsius and pressure=101.3kpa, maximum cycle temperature= 1800degree celsius, what is temperature after compression,te

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