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

Determine the actual absolute velocity, Question: As shown in the figur...

Question: As shown in the figure, the jet transport B is flying north with a velocity v B = 600 km/h when a smaller aircraft A passes underneath the transport headed in the 60

Explain construction and working of rope brake dynamometer, Explain constru...

Explain construction and working of Rope Brake Dynamometer? Determine Power also ?

How to define automatic float operated gauges, Q. How to define automatic f...

Q. How to define automatic float operated gauges? In recording type gauges, automatic float operated gauges are more common. The well for the float provides room for installati

Cement, wet process of portland cement

wet process of portland cement

Explain in detail about the large excavations, Explain in detail about the ...

Explain in detail about the Large excavations Large excavations required for construction of rafts may need dewatering, depending on the ground water flow and the choice of  a

Calculations for force, Calculations for force: A square block having...

Calculations for force: A square block having 25cm side and weighing 20N is hinged at point A and rests on rollers at point B as shown in the figure given below. It is pu

Governors, The spring controlled governor of the Hartung type has two rotat...

The spring controlled governor of the Hartung type has two rotating masses each of 2.5kg and the limits of their radius of rotation are 100 mm and 125 mm. The each mass is directl

Special casting methods, Special Casting Methods: 1. Die casting : D...

Special Casting Methods: 1. Die casting : Die casting is a permanent mould casting techniques in which molten metal is forced in the mould cavity under a pressure of 700 to

Melting point, What is melting point of aluminium?

What is melting point of aluminium?

Equations by gauss-jordan method, a) Answer the following equations by Gaus...

a) Answer the following equations by Gauss-Jordan method x 1 +2x 2 +x 3 =8 ; 2x 1 +3x 2 +4x 3 =20; 4x 1 +3x 2 +2x 3 = 16 b) Answer the following equations by Relaxation m

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