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

Semi-active suspension systems, With an open loop system, the only way to m...

With an open loop system, the only way to modify the behaviour of the system is to modify the values of physical parameters in the system. For instance we can modify the damping co

High pressure die casting process, what is the working princile of high pre...

what is the working princile of high preesure die casting process

Pin-jointed steel structure, Pin-jointed steel structure: Find out the...

Pin-jointed steel structure: Find out the forces in the members of the pin-jointed steel structure. Solution Joint D  Suppose f CD and f DE both as tensile forc

Stress concentration factor, 1. Write a short note (not more than half A4 p...

1. Write a short note (not more than half A4 page) on your understanding on St. Venant's Principal for your engineering design analysis. 2.  Estimate the " Stress Concentration

The diameter dimension command, The Diameter Dimension Command You can ...

The Diameter Dimension Command You can use the Diameter command to annotate a circle or an arc with a diameter dimension. To achieve this simply start the command, pick a point

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

What are the problem arise in pile foundation, What are the problem arise i...

What are the problem arise in pile foundation Problems can also arise in providing pile foundations in residual soils which are underlain by sloping rock. Special rock sockets

Explain interpoles or commutating poles, Interpoles or commutating poles ...

Interpoles or commutating poles Interpoles are ?xed to the frame in among main poles. They are used for sparkless commutation, i.e, to improve commutation.

Find the out value of force - cantilever truss, A cantilever truss is loade...

A cantilever truss is loaded and supported as shown in the figure given below. Find the out value of P , which would produce an axial force of magnitude 3KN in member AC .

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