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

Explain about burner management system, Q. Explain about Burner Management ...

Q. Explain about Burner Management System? The Vendor shall provide a stand alone Burner Management System that is NFPA approved. Provision shall be made for communication wit

Density and specific volume - thermodynamics, DENSIT Y (ρ ): Density ...

DENSIT Y (ρ ): Density is defined as mass per unit volume; Density = mass/ volume; = m/v, kg/m 3 P for Hg = 13.6 × 103  kg/m 3 for water = 1000 kg/m 3 Specifi

Compute monitoring and control, Compute Monitoring and Control: These are t...

Compute Monitoring and Control: These are the direct application in which the computer is connected directly to the manufacturing process for the purpose of monitoring or contr

Draw a single point cutting tool, Draw a single point cutting tool and defi...

Draw a single point cutting tool and define its various parts. Also describe the standard anglesof this cutting tool.

Combustion , How do i calculate the flame radius and flame speed if unstret...

How do i calculate the flame radius and flame speed if unstretched flame speed=2.8m/sec and markstein length=5 mm. ?

co2 welding, CO2 Welding CO2 Welding is a variation of GMAW. Here the ...

CO2 Welding CO2 Welding is a variation of GMAW. Here the inert gas is replaced by gas mixtures or carbon dioxide, which are chemically active. The carbon dioxide decomposes in

Coplanar and non-coplanar forces, Coplanar and Non-Coplanar Forces: In...

Coplanar and Non-Coplanar Forces: In this unit, you have learnt to identify the different systems of forces. You have also learnt the many techniques of adding the forces to g

Key words related to air transportation, Keywords related to Air transporta...

Keywords related to Air transportation: Airfield/Airport       :            The area which contains the facilities needed for the operation of aircraft. Apron

Describe the type of facing and backing sand, Q. Describe the type of Facin...

Q. Describe the type of Facing and Backing sand? Facing sand. This sand is used directly next to the surface of the pattern and comes into contact with the molten metal when th

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