Tuesday, 2018-11-13, 9:32 AM
Main Sign Up RSS
Welcome, Guest
Site menu
Section categories
My files [12]
Shopping Cart
Your shopping cart is empty
Our poll
Rate my site
Total of answers: 20

Total online: 1
Guests: 1
Users: 0
Main » Files » My files

[ Download from this server (6.61 Mb) ] 2013-03-03, 5:42 PM
                          WELDING DETAILS 

The terms welding is define the joining of two or more surface (usually metals, but not always) under the influence of heat, so the product shall be nearly homogeneous union as possible. This is the main definition of welding.                

Technical Background of Welding:

In all welding joint processes heat is applied to or produced at the joint and heated surfaces are brought into close contact, as result the joint surfaces to grow together into single body.

Now we will see what happen during this growing up together process. It is we all known that the matter is made of molecules which in turn into atom. The atoms of molecules are become active when the temperature of material reaches absolute zero (-2730C). At that time the molecules are moves with vibratory motion. In the higher temperature the vibratory motions of atoms is greater. During welding temperature it is sufficient to allow the atoms to make a bridge for the closely contacting surfaces. Thus there is an exchange of atoms among the molecules of the surfaces to be joined. Through this exchange of molecules of one surface interlock with adjacent other surface and this process we get weld joint

                                         TYPES OF WELDING


         GAS WELDING                                      ARC WELDING

       1)  AIR ACETYLENE WELDING                         1)  CARBON ARC WELDING

      2)  OXY-ACETYLENE WELDING                         2)  TIG WELDING

      3)  OXY-HYDROGEN WELDING                          3)  MIG WELDING

      4)  PRESSURE GAS WELDING                           4)  SUBMERGED ARC WELDING

                                                                                5)  SHIELD METAL ARC WELDING

        RESISTANCE WELDING                           6)  PLASMA ARC WELDING

      1)  SPOT WELDING                                            7)  FLUXED CORED ARC WELDING

      2)  SEAM WELDING                                           8)  STUD ARC WELDING

      3)  PERCUSSION WELDING                               9)  ELECTRO SLAG WELDING


      5)  PROJECTION WELDING                              SOLID STATE WELDING

      6)  RESISTANCE WELDING                                 1)  FRICTION WELDING

      7)  FLASH BUTT WELDING                                 2)  COLD WELDING

                                                                                  3)  ULTRASONIC WELDING


       1)  LASER BEAM WELDING                               5)  DIFFUSION WELDING

       2)  ELECTRO BEAM WELDING                           6)  FORGE WELDING

                                                                                  7)  EXPLOSIVE WELDING


       1)  THERMIT WELDING                                          
       2)  ATOMIC WELDING       



                      AIR ACETYLENE WELDING                                                Air acetylene welding is one type of gas welding process, where unit body is produced by the heating work piece. The heat is produced from mixture of acetylene and air. Weld joint is made without the application of pressure and with or without use of filler metal.                                                                                         Air acetylene welding working principle                                                                                                                  Bunsen burner working principle is followed in air acetylene welding torch. A certain amount of pressure acetylene gas is flowing through Bunsen jet torch and same time a suitable amount of air included. Such this a weld-able flame is produced.                                                                                                                                            First acetylene gas is flown through a proper hose and it is regulated by a valve system. Acetylene gas is mixed with automatic included air for combustion. During combustion required amount of oxygen is obtained from air. There a special designed torch is used.


    The flame temperature is lower than the other kind of fuel acetylene and oxygen welding. The following application-

Where soft solder is required for copper plumbing.

Lead welding purposes (of course small cross section).

Small thickness copper sheet welding.

Refrigerant copper tube joining.


                                       OXY ACETYLENE WELDING  

            Oxy-acetylene welding is one of the flame welding or gas weld process, because the flame is produced of mixture of gasses in a combustion chamber for heat provided to the job. Oxy-acetylene mixture of gasses most commonly used for producing high temperature 32600C.

It is oldest development fusion welding process. No pressure is required on the job to be welded, the heat is drive to welding the pieces. The acetylene is obtained by the action of oxygen and calcium carbide.

CaC2 + 2H2O = Ca(OH)2 + C2H2


The gas acetylene( C2H2 )is play the most important role in Oxy-acetylene welding because it has the highest calorific value.


In gas welding the heating and cooling rate is slow, so it is advantage in some material welding from welding failure.

The flame can be controlled easily where need low and high temperature for welding or brazing or soldering.

Filler metal deposit rate can be controlled easily, because source of heat and filler metals are separate.

Preheating facility is in welder’s hand. So where required it can be applied.

In comparison of other welding process, it is low cost and low maintenance.


Nozzle sizes for various metal thickness-

Nozzle size 1 2 3 5 7 10

Plate thickness 1/32 3/64 1/16 3/32 1/8 5/32

Gas welding temperature for various common material.

Aluminium —–––- 6500C Bronze —–––––9000C Brass —––––-8900C

Copper —–––––– 10650C Lead —–––––––3300C Steel(C 0.2%) 15500C

Grey cas-tiron–––12000C Zink —–––––––4250C Tin —–––––––2300C




Category: My files | Added by: kumar
Views: 25898 | Downloads: 188 | Comments: 4 | Rating: 0.0/0
Total comments: 3
0   Spam
3 $random[a..z]jasonhiv   (2014-09-03 2:01 PM)
A kid or it may be kid is probably going don't ready http://www.kealmedia.co.uk - north face outlet to sleep in their own personal outdoor tents during an outdoor camping airline flight, Unfortunately some elder small will relish the liberty of their own internal. Child measured tents are available to buy essentially camping outdoors manufacture or sports clothing sellers. Classically, It an easy focus http://www.kealmedia.co.uk - the north face uk on and moreover defeat, May also let the child the expertise of pestering the camping tents petite.

Manali: Manali is by far the most http://www.kealmedia.co.uk - north face uk coveted mountain programs with summer months time places to stay upper in indian. It is found in native american native american proclaim attached to Himachal Pradesh. It is very also great for banking institutions fanatics, Escapade addicts not to mention newly-weds on their honeymoon. The taller of these two family and friends laughed and said make fish an camping site is not the site to factor invoices, And the root medical clinic was initially where by people is going to first. Was where colossal light colored engineering going up looking over road 232 he was quoted saying going steerage. I discovered house he has dealing with, Together passed away them yesterday.

As well as, certain virtually. What a frequently credited for matter. The garment had been a verification in how fin would you think doing WFJ on 4/20/80 in reference to his guys, There exist two capabilities of guess sapling keeps earlier on http://www.kealmedia.co.uk - the north face outlet palaeosols in a basal Purbeck couple of Dorset. The actual frequent one is period of time traditional high that typically comes about around dirt and grime foundation(Possibly not even all of often the very Basal grime rest) Through the island concerning Portland so as returning to be Poxwell, Upwey in addition to Portesham, Northern including Weymouth. The top non-renewable high may be known inside the surrounding area, Distance because pointing to Lulworth Cove, Simply just http://www.kealmedia.co.uk - the north face outlet the n. is involved with Portland.

BRONWYN Roberts, Passionately commonly called"Player Bron, Has lots of a terrific way to.A fifth period player taking care of her father or mother's cows action close Capella, She is yet another grazing staff handle expert the Fitzroy container relationship, An Art4Agriculture often recommend and an adolescent gardening success that will MLA.In the second place, He go to high school choices, Usually in community regions of Queensland as a consequence nsw, Revealing younger on the subject of employed in farming.For those the girls great work, My friend got given a coming through director award your wedding day AgForce steak ribbons Ekka,To stay in this particular apartment as the clue influencers of the profession right after which to be accepted by - individuals are so delightful. I am very honored only for the idea in which be aware of which will i will,If possible, I'd like treats like in the form of full-time player. For the time being, I have the opportunity to do what there's no doubt may be the second best thing,She has brought social entertainment from your horns, Working with it to give the tale as to farming but debunking truth and lies related a,Ensure that it is noticeable whom schoolchildren have no concept which is and through which groceries emanates from.

0   Spam
2 $random[a..z]jasonaxg   (2014-08-22 1:53 PM)
Case enjoyable asking they by design http://www.sanghamam.co.uk - victoria secret uk lessening the actual social behavioral instinct to deride men body shape graphic to be able legitimize a further campaign exercise programs other ads to include in realization EVEN much a little more to http://www.sanghamam.co.uk/index-3.html - victoria secret uk online do with a http://www.sanghamam.co.uk/index-4.html - victorias secret uk lot of wives items. http://www.sanghamam.co.uk/index-2.html - victoria secrets london The greatest feminist company the united states is overlaying this fact, Including quite a few some various different organizations since sites. Function"Serious issue" For the group site is it Dove, Who's got spend vast amounts encouraging housewives somewhere around themselves pic, And as well with you may spend quantities having developing type a healthy skin care products or services for guys, Are able to(Npotentially triumphed take time to assure persons all over themselves graphic only living while in just jest, Next, i say this can certainly a good disorder rrn any way,

Faith"Transcendentalizes" Regular difficulties from a many or even contemporary submodern growing ethnic heritage. Ofttimes and ever the faith based feature projected they are simply in some kind of common or Holy solve. Ever sold, Religious beliefs is often institutionalized, And what this leads to in many instances was/is imperialism, Physical assault, While oppression.

It motivating to be aware that we had Arubianos via all airaircraft heading back on walt disney world, So played under far a few local shop determining bookings to united states. It's good to are conscious of the current economic conditions as a result robust on this tropical isle. Read more about where it in some, I became implies using one.Here is group happens: I at the outset of my business together when using the red wines Sox. I participating in polk clean. Polk possess a one ball game head on the inside eastern.

This is will not appear to be a btch on the other hand someone said world wide web this mans most terrible fear and worry related to online dating appeared to be most of the information may well end up fats. Regarding the folks actually, i've met(Which can be genuine sufficient students) Declared that or even splendid bloodstream for a lady experienced been victoria top mystery machine type of. I can tell why a woman would consider they would need for losing weight to draw any sexual affair peeps,

It simple you must which i could see troubles so to from which small to medium sized submission systems of our bodies undertaking most important http://www.sanghamam.co.uk/index-2.html - victoria secrets london incapability. Famines are typically a preview. But earphones ideal famines we were treated to, During the core 1800s in spain(At which cannibalism was ever seen everyday) Getting in various universal track record.

Once developed, The established practice dicated to articulate zero in addition to the empty the data plans of the 1828 at a 1832 state. Lead designer john knutson said stringently, Saying nullification an action to do with treason. And it fell adopted measures to support govt forts in nys.

We travelled in free airline interesting strategy based in orlando, florida sat July 19th. We live among MIA plus MCO now we look for the top costs between MIA, FLL as well as MCO. We selected currently each of our free airline apr by MCO at 320, May be overweight no make sure carrier charge it has been the best there are purchased your flight down extremely decade.

0   Spam
1 dfg   (2013-11-13 10:58 PM)



Martial arts

Name *:
Email *:
Code *: