Tugas -04_Fajar Yusya Ramadhan_1306448312

8/18/2019 Tugas -04_Fajar Yusya Ramadhan_1306448312

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Fajar Yusya RamadhanTugas-04 Welding

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1. The principle of cold welding material which is two ends facing each other, clamped

using a clamp , the next pressure both ends so that the connection process may occur .

Style sizable required in this process so that it contacts the interface is good.

¬ The main requirement for the material can be joined by this method are:

!t least one metal that will ha"e a resilient nature # "ery tough .

$o not undergo drastic strain hardening .

%. Threshold deformation is a "ery important parameter which the function is to determine

the maximum power that can be obtained from the cold welding process . &sability

threshold deformation is to mendpat'an minimum limit "alue that has ties to the material

deforms when cold .

(xample calculation for !luminum and The alloy material :

)nitial thic'ness * to + 1- mm

inal thic'ness * tf + / mm

Then,

Deformasi=10−5

10 x100

Deformasi=50

0. actors affecting the threshold deformation "alue is:

a. The crystal structure of materials b. b . type of material

c. ressure exerted on the material

d. surface preparation 2ere is the relationship between the threshold deformation by

pressure and surface preparation in the cold welding process : ressure on

material deformation threshold 3 4 5 and 3 connection strength The better the

surface when prepared then , the threshold deformation 5

6. (xplosion 7elding is a solid state welding process in which the connection is produced

by high8speed collisions ha"e on the wor'piece from the explosion.


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The wor'ing principle of explosion welding which uses three components: base metal,

prime metal, explosi"e. $etails of the wor'ing principles of explosion welding are:

a. The three components are arranged, prime component placed on the middle layer and a

detonator at the top.

b. 7hen the detonator detonated the prime component will pound base metal so that

plastic deformation occurs and the two plates are connected.

/. 7or'ing rinciple of this welding is of the ultrasonic "ibration obtained from the

transducer is transmitted to the tip of the sonotrode so that the two metals that you want

to connect will arise when the heat and subsequent rupture of the oxide layer with the

pressure of clamping will result in material connected.


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)n ultrasonic welding method is there is a relationship between the energy needed and

weldability, which can be seen from the formula below:

7here:

( (lectrical (nergy, 7.s *9+

;onstant of welding systems

2 . The working principle of this welding is :

a. Two workpiece is pressed and rotated so that both will arise due to friction heat .

b. Then used for the connection process


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The stages can be explained from the image above:

a) The object is rotated

b+ The object pressed into the stationary objects spinning

c+ Occurs friction

d+ Occurs Welding

Advantages Disadvantages

2eating of friction occurs locally, so

that softening does not spread

&sually for circular objects

7ithout any metal melting or same 'ind and same geometry

shape of metals

ast process reparation pf sampel affects the

welding product

;an weld % different materials 2igh cost

(xample of friction welding:


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?. rinciple of @oll Aonding:

Keuntungan Keterbatasan

To connect two different materials to

obtain metal with different applications

@elati"ely seldom used for mass

production;an be applied at room temperature and

hot temperature

$e"elopment of these methods are not

sufficiently comprehensi"e

Aplikasi field: For US quartes, to make the two outer layers of !" #u $ %! " &i in

the middle of pure #u'

B. The principle of friction stir welding :

1 + in rotating at a speed of 0---86--- rpm is put on material

% + The material is heated due to friction

0 + The material that has been heated to reach a temperature of plasticizer * B-- to

aluminum +

6 + Caterials that ha"e been terplastisasi draped bac' to pin


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/ + The material is cooled with formation of grains 8 grains finer dibandig'an with the

parent material .

Cetal material that is generally applied to this method :

Cagnesium

;opper

!luminum and aluminum alloys

Dead , etc.

S7 ad"antages :o (nergy efficiency

o Simple and clean

o Core powerful and cleaner when compared to fusion welds

o low distortion and shrin'age

o high ductility in the weld

o =o porosity , lac' of fusion, changes in the composition of the material

o =ot required treatment after the process

E. The welding parameters for S7 :

2eating the material to a temperature of B--

The amount of minimum rpm : 0---86--- rpm

Schematically welding area :


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7hen using S7 is obtained in the form of structural weld area finer connection than on

its base metal . )t is obtained due to the structure of sambugan produce finer grains than

its base metal .

1-. Caterial from which , among others, !)S) 210 , !)S) 2%% , etc.

The material must ha"e a melting point higher than the wor'piece . referably the stirrer

material must ha"e a melting point of at least 1-- ahrenheit higher than the wor'piece

or %-- for aluminum . urthermore, the stirrer material should also ha"e a higher

strength than the wor'piece . )n addition the material must ha"e good wear resistance ,

and good machinability . The type of surface treatment that can be done between heat

treatment such as hardening , tempering * lowered into a 6/86? 2@; hardness +

11. The difference of ultrasonic welding and spot welding:

Ultrasoni( welding Spot resistan(e

The quality of the connection for thetransfer enerfi uniform and constant

residual heat released and limited to the

connection area

There is smo'e on the welding process


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The required pressure is small and heat up

to the middle

heat does not get to the center

or the metal ha"ing high conducti"ity

* ;u , !l + only requires a lower energy

)n metals with high conducti"ity requires

high energy

Ae able to connect different metal

* dissimilar + e"en metal8plated * plating #

coating+

There are spar's that could cause a fire or

explosion

Fenerally used for relati"ely small 8sized

metal "ulnerable

(lectrical shoc' occurs

There is no melting area 2a"e melting area

7hen using the current density is toohigh , it can cause molten metal was

thrown and the impact on the formation of

ca"ities , crac's and degrade the

mechanical properties of the weld results

Tugas -04_Fajar Yusya Ramadhan_1306448312

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