Foreign inclusions-slag inclusions-oxide films in fusion wel, Mechanical Engineering

Assignment Help:

Foreign Inclusions

 

Slag inclusions

This is formed due to entrapment of oxides and non metallic solid material in the weld deposit or between the weld metal and base metal. Due to their low specific gravity, the slag normally floats over the molten metal unless they are restrained. Because of the stirring action of the arc, the slag may be forced down below the molten metal and the high viscosity of the weld metal, rapid solidification at a low temperature may prevent the release. Slag inclusions usually appear as a linear continuous or interrupted bands. Slag inclusions inside a weld would have rarely, resulted in service failures unless they occur along the surface or were of a sufficiently large section to reduce significantly the strength across the wall thickness.

Proper preparation of the groove before depositing further layers, preheating the base metal to have control on the rate of solidification and hence release of slag from molten metal, avoiding larger size electrode for root pass welding, thus preventing the slag flowing down into the root opening, are some of the ways of preventing slag inclusion.

Oxide films in fusion weld


Because of inadequate shielding, often encountered in MIG welding, a thin film of oxide forms on the globules of deposited weld metal. The presence of such films (defects) seriously impairs the ductility of the weld metal. This defect is rarely detectable except with the aid of a microscope.


Related Discussions:- Foreign inclusions-slag inclusions-oxide films in fusion wel

Find out the amount of energy spent, Find out the amount of energy spent: ...

Find out the amount of energy spent: 6 cubic metre of water is to be lifted to a height of 40 metres and delivered having velocity of 4 metres/sec. If this operation takes 12

Principals, do you know the grade to the answers of the questions in the pr...

do you know the grade to the answers of the questions in the pre paid solutions..?? and what if the answers are wrong..?? as i need all working out shown

Show pneumatic test, Q. Show Pneumatic Test? Pneumatic testing presents...

Q. Show Pneumatic Test? Pneumatic testing presents hazards that must be addressed as part of the engineering design of the pressure vessel. Due to the additional hazards of

Explain different types of frames, (a) Explain different types of frames. C...

(a) Explain different types of frames. Compare their merits and demerits. Diagram and illustrate a frameless construction. (b) Illustration briefly the constructional features o

Determine the maximum shear stress, Determine the maximum shear stress: ...

Determine the maximum shear stress: A beam of triangular cross section of base width 120 mm & height 80 mm is subjected to a shear stress force of 3 kN. Determine the maximum

Explain the hydrostatic pressure, Explain the Hydrostatic Pressure Hydr...

Explain the Hydrostatic Pressure Hydrostatic Pressure also called Pressure because of Depth of a Fluid. It is required to define the pressure exerted by a static fluid column o

#title.scale, actual division 2km is shown as 1 cm in a map.construct a cle...

actual division 2km is shown as 1 cm in a map.construct a clean scale to measure km which can travel a distance upto 30 km.Show measurement of 18 km in the scale

Introduction to general safety and service tips , INTRODUCTION: Safety is ...

INTRODUCTION: Safety is very important which is often neglected at our workplaces. Small precautions if carried out regularly can ensure safe, hygienic and clean environment at ou

Stress analysis reporting, Q. Stress analysis reporting? • Stress sketc...

Q. Stress analysis reporting? • Stress sketch with all node points, dimensions, pipe schedule, weights of non-standard components, e.g., control valves and actuators, insulatio

What is boiler feedwater, Q. What is Boiler feedwater? The boiler feedw...

Q. What is Boiler feedwater? The boiler feedwater will be a mixture of desalinated water, treated make-up water and returned condensate, deaerated and heated, supplied by other

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