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

Stress distribution diagram, why stress distribution diagram is different f...

why stress distribution diagram is different for I section, T section andcircular section?

Oil gun-tool and equipment , Oil Gun: This is used to supply fluid oil to ...

Oil Gun: This is used to supply fluid oil to chassis lubrication (Figure). Figure : Oil Gun

Safety benefits - industrial safety, Safety Benefits - Industrial Safety ...

Safety Benefits - Industrial Safety An industry or a company which follows safety programmes is benefitted in several ways. The benefits are shared among employer and employee

Engine, maximum rpm at engine

maximum rpm at engine

Can you implement compatibility test, Q. Can you implement Compatibility te...

Q. Can you implement Compatibility test ? This test indicates the decrease in height of a mass of sand in a specimen tube with respect to its original height, under the actio

Drum brake-types of brake , Drum Brake: The construction of drum brake is...

Drum Brake: The construction of drum brake is clearly shown in Figure 2.40. In a rotating brake drum stationary brake shoes are attached concentric to the axle hub. A back plate

Scope of materials for sulfuric acid service, Q. Scope of Materials for sul...

Q. Scope of Materials for sulfuric acid service? This Engineering Practice presents materials of construction commonly used in Sulfuric Acid service. The corrosiveness of sulfu

Tensile stress, T ensile Stress: The stress induced in a body, when ...

T ensile Stress: The stress induced in a body, when subjected to two equal and opposite pulls as shown in figure (a) as a result of which there is an increase in length,

Piping inspection and test plan, Q. Piping Inspection and Test Plan? Pi...

Q. Piping Inspection and Test Plan? Piping Inspection and Test Plan review and Piping Materials Test Results review shall be by the Piping Materials group, or by / with assista

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