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Answered on 21 May Tuition/Engineering Diploma Tuition

U.K. Akshay

Math Expert Educator and Spoken English Trainer with 12 Years Experience of Teaching and Educating.

It is an electrochemical cell which converts the chemical energy of cell into electrical energy. It is also called a voltaic cell.
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Lesson Posted on 07 Apr Tuition/Engineering Diploma Tuition

What Are the Types of Columns?

Phani J V

Basics,concept,practice is my motto, exam point of teaching, personal care of student is my interest,encourage...

Tied Column. Spiral Column. Composite column. Axially Loaded Column. Column with Uniaxial Eccentric Loading. Column with Biaxial Eccentric Loading. Short Column. read more
  • Tied Column.
  • Spiral Column.
  • Composite column.
  • Axially Loaded Column.
  • Column with Uniaxial Eccentric Loading.
  • Column with Biaxial Eccentric Loading.
  • Short Column.
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Lesson Posted on 05 Apr Tuition/Engineering Diploma Tuition

what is ultimate load method?

Phani J V

Basics,concept,practice is my motto, exam point of teaching, personal care of student is my interest,encourage...

In this method, ultimate or collapse load is used as design load. The ultimate loads are obtained by increasing the working/service loads suitably by some factors. These factors which are multiplied by the working loads to obtain ultimate loads are called as load factors read more
  • In this method, ultimate or collapse load is used as design load.
  • The ultimate loads are obtained by increasing the working/service loads suitably by some factors.
  • These factors which are multiplied by the working loads to obtain ultimate loads are called as load factors
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Lesson Posted on 01 Apr Exam Coaching/Engineering Entrance Coaching/GATE Coaching/Mechanical Tuition/Engineering Diploma Tuition/Mechanical Engineering Diploma Tuition/BTech Tuition/Basic Mechanical Engineering +1 Tuition/BTech Tuition/BTech Mechanical Engineering less

Welding Defects - Causes and Remedies

Avantika P.

An Enthusiatic Engineer up for teaching and always keen to learn and try new things. I have a degree...

DEFECTS IN WELDING (CAUSES) Improper welding parameter and wrong welding procedure introduce the welding defects in welded Joints. A defective welding Joint may fall under service condition and can cause damage to property and human lives. Welding defects can be broadly classified into three categories... read more

DEFECTS IN WELDING (CAUSES)

  1. Improper welding parameter and wrong welding procedure introduce the welding defects in welded Joints.
  2. A defective welding Joint may fall under service condition and can cause damage to property and human lives.
  3. Welding defects can be broadly classified into three categories as:

(a) Warpage: It is unintentional and undesirable deformation of welded Joint. It occurs due to different rates of solidification.

(b) Overlapping: An overlap occurs when the molten metal from the electrode flows over the parent metal surface and remains, without getting correctly fused.

  • It may occur due to:
  • Lower arc current.
  • Slower arc travel speed.
  • Longer arcs.
  • Incorrect electrode diameter.

(c) Porosity: Porosity is a group of small voids, blowholes or gas pockets. They occur mainly due to entrapped gases.

The parent metal melted under the arc tends to absorb gases like carbon monoxide, nitrogen and oxygen If they are present around the molten weld metal pool. It occurs due to:

  • The improper coating on an electrode.
  • Fast speed of arc travel.
  • Too high or too low current.
  • Damp electrode.
  • Scale, rust, oil, grease, moisture etc.
  • Incorrect welding technique

(d) Inclusions: Inclusions may be in the form of slag or any other foreign material. This foreign material does not get a chance to float on the surface of solidifying weld metal and gets trapped inside the same. Inclusions lower the strength of salt and make it weak. Factors promoting Inclusion are:

  • Slag from previous runs not being cleaned away.
  • Insufficient cleaning and preparation of the base metal before welding commences.

 (e) Incomplete penetration: Penetration is the distance from the base plate top surface to the maximum extent of the weld. Various causes of incomplete penetration are:

  • Improper joints.
  • Gap too small.
  • Less arc current
  • Faster arc travel speed.
  • Too large electrode diameter.
  • Incorrect polarity.

(f) Cracks: Cracks may be on a microscopic scale or macroscopic scale depending on their size. The break may appear In the base metal, base metal-weld metal boundary or the weld metal. The crack may be on the weld surface or under the weld bead. A break may occur in the creator or the root.

Leading causes of crack formation are:

  • Rigidity In joint a joint member not free to expand or contract.
  • Unsuitable parent metals used in the weld
  • Hardenability
  • Fast arc travel speed.
  • Electrode with high H2 content.

(g) Incomplete fusion: Sometimes, the molten metal deposited by the electrode does not fuse properly with the cold base metal, and two metals do not fuse completely. Fusion may be lacking at the root, sides or between two runs in the multi-run weld. Factors promoting Incomplete fusion are:

  • Lower arc current.
  • Faster arc travel speed.
  • Improper welding technique.
  • Presence of oxides, rust, scale and other Impurities.
  • Incorrect joint preparation.

(h) Spatter: Sometimes, the molten metal splash with small droplets or sprinkles around the melted metal is a common defect known as spatter. It is due to the gap between workpiece and electrode, speed of welding etc.

(i) Undercut: Undercut is the groove melted into the base metal adjacent to the toe of the weld. It is due -

  • the non-uniform feed of the filler.
  • Too fast a travel
  • Bad welding technique
  • Too high a heat build-up

 

Defect remedies:

  1. Improve core venting, provide venting channels, and ensure core prints are free of dressing.
  2. Reduce amounts of gas. Use slow-reacting binder. Reduce the quantity of binder. Use coarser sand if necessary.
  3. Apply dressing to cores, thus slowing down the rate of heating and reducing gas pressure.
  4. Dry out cores and store dry, thus reducing the absorption of water and reducing gas pressure.
  5. Reduce the moisture content of sand. Improve conditioning of the sand. Reduce inert dust content.
  6. Improve gas permeability. Endeavour to use coarser sand.

 

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Answered on 03 Mar IT Courses IT Courses/IT Automation Functional Training/Entrepreneurship Training +1 Tuition/Engineering Diploma Tuition/Industrial Project & Entrepreneurship Development less

Shashank Mulkraj Dubey

Martial arts Teacher(Sr. Master) with 15 year experience!

If you completed your MBA,then you can go with (PMP) project managment proffesional ,ItS A 6 Month edition training ,Its biggest benefit is that you have learn important skill which is grow your earning &provide network opportunities with your Validate Dedication your Job.
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Lesson Posted on 27 Jan Tuition/Engineering Diploma Tuition Tuition/BTech Tuition/Engineering Mathematics (M1) Exam Coaching/Engineering Entrance Coaching/GATE Coaching/Aerospace

Smart Work Instead Hard Work.

Buds Engineering Academy

ONLINE Training Academy Bud's Engineers & Technologies is a well versed institute in pune focused...

Yes, " Hard work never Goes Without Reward " But, Excellency in learning outcome can be achieved by the following:- 1. Plan in advance, Plan in Detail, Keep all options open. choose the correct way of learning:- 1. Learning by reading. 2.Learning by schooling. 3.Learning by doing. 4. Learning... read more

 Yes, " Hard work never Goes Without Reward "

But, Excellency in learning outcome can be achieved by the following:-

1. Plan in advance, Plan in Detail, Keep all options open.

choose the correct way of learning:-

1. Learning by reading.

2.Learning by schooling.

3.Learning by doing.

4. Learning through mentoring.

5.Learning by taking a very big risk.

 

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Lesson Posted on 21 Jan Tuition/BSc Tuition/Computer Programming in C Tuition/Engineering Diploma Tuition/Computer Programming IT Courses/Programming Languages/C Language +1 Tuition/BCA Tuition/C Language Programming less

C Programming basics

Om Kumar

I am a computer science aspirant from Jawaharlal Nehru Technological university. I have completed my...

C PROGRAMMING BASICS 10 Hours Introduction to ‘ C’ programming –fundamentals – structure of a ‘C’ program – compilation and linking processes – Constants, Variables – Data... read more

 C PROGRAMMING BASICS                                                                        10 Hours

 

Introduction to ‘ C’ programming –fundamentals – structure of a ‘C’ program – compilation and linking processes – Constants, Variables – Data Types –Expressions using operators in ‘C’ – Managing Input and Output operations – Decision Making and Branching – Looping statements – solving simple scientific and statistical problems.

 

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Answered on 02 Feb Tuition/Engineering Diploma Tuition/Chemical Engineering Diploma

Where is the best web web desig classes in kadapa

Vijay Kumar

JAVA Certification is the Key to get Java Programming Job

Hi Ganga, if you have internet connection and laptop learn online from a good tutor. also perpare for Oracle java certification. Total cost will also be less.
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Answered on 26/09/2019 CBSE/Class 11/Commerce/Business Studies Functional Training/Business Analysis Training IT Courses/Business Objects Enterprise XI +2 Tuition/BCom Tuition/Entrepreneurship and Small Business Tuition/Engineering Diploma Tuition/Industrial Project & Entrepreneurship Development less

Hitesh

Have 22 Years of Experience! International School Faculty from Delhi

Go for Online lessons. You will come across many free courses from Universities abroad.
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