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

Applications, applications of dynamically induced emf

applications of dynamically induced emf

Equation of motion of lift, Equation of motion of lift: Write equatio...

Equation of motion of lift: Write equation of motion of lift when move up and when move down   Assume,   W = Weight carried by lift m = Mass carried by lift = W

Strength of material, What us the duff between direct stress and bending s...

What us the duff between direct stress and bending stress

Find out the product of inertia of a rectangular area, Find out the product...

Find out the product of inertia of a rectangular area: Find out the product of inertia of a rectangular area b × d with respect to its sides as illustrated in Figure Solut

Inspection of tyres , Inspection of Tyres STEPS Both the tyres are...

Inspection of Tyres STEPS Both the tyres are checked for free rotation. Loose spokes are to be tightened. At the same time it is checked that the tyre is not dam

Just-in-time, Just-In-Time: This unit begin with the discussion of Jus...

Just-In-Time: This unit begin with the discussion of Just-In-Time strategy. Several terms used in the process are also explained. JIT is an encompassing philosophy considering

Babbitts- bearing materials, Bearing Materials Generally it can be sai...

Bearing Materials Generally it can be said as a good bearing material must posse following characteristics as: It must be strong enough to sustain bearing load. It

Gear boxes , Gear Boxes : Motorcycle engines do not produce their full pow...

Gear Boxes : Motorcycle engines do not produce their full power at all RPM. There is very little power at idle and the power goes up as the engine RPM increases. At a certain RPM,

Winch gearbox design, An engine repair workshop in County Durham has identi...

An engine repair workshop in County Durham has identified a need  for a winch which is  to lift complete engine assemblies from floor level up to workbench level  to allow  remedia

Find out ratio of strain-energy, Find out ratio of strain-energy: A ci...

Find out ratio of strain-energy: A circular rod of diameter d and length l is fixed at one end and a torque T applied at the other. Now, if any close coiled helical spring is

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