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Advanced Metallurgy(Welding Metallurgy)

Presented by

Marwan Faisal

Mohamed Abdel Moniem1

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Outlines

Basics of welding metallurgy

Microstructure of weld

o

ron!carbon "hase diagram

Welding Metallurgy

o Fusion #one

o

$eat a%ected #oneo &i%erent #ones in steel weld

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Outlines

Problems Associated with e!melting andolidi*cation in Welding

o Formation of grains in fusion #one

o Macro segregation

o $ot +rac,ing

o Cold Cracking

o -ameller .earing

o eheat +rac,ing

Welding ins"ection

o /on &estructive .esting

0isual ns"ection

Weld Penetrant eamination

adiogra"hic eamination eferences

eferences

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Welding metallurgistwill eamine thechanges in "hysicalcharacteristics that

ha""en in short"eriods3

.he solubility of gasesin metals and betweenmetals and the e%ect

of im"urities are all ofma4or im"ortance tothe weldingmetallurgist3

Basics Of Welding Metallurgy

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.he overall arrangement of grains6 grain boundaries6 "hases"resent in an alloy is called its microstructure3 t is largelyres"onsible for the "ro"erties of the metal3

.he microstructure is a%ected by the com"osition or alloy contentand by other factors such as hot or cold wor,ing6 straining6 heattreating etc3

The microstructure of weld metal and adjacent metal isgreatly inuenced by the welding process, which inuencethe properties of the weld.

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Microstructure

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89uilibrium diagrams are used to determine the "hases that are"resent and the "ercentage of each6 based on the alloycom"osition at a tem"3 And changes by increasing and decreasingtem"3 Most of them are designed for alloy system containing twoelements3

n welding because of ra"id changes in tem"eratures6 e9uilibriumconditions are rarely occur3 n an e9uilibrium condition6 the metalis stable at the "articular "oint on the diagram based on relativelyslow heating and cooling

ron!carbon e9uilibrium diagram "rovides an insight of thebehavior of steels in connection with welding thermal cycles andheat treatment3 .his diagram re"resents the alloy of iron withcarbon6 ranging from :; to 7; carbon3