Welding PPT (New)

By Irfan Mehmood QC Engineer  APL

Contents       

Definations Types Of Welding Processes  Welding  Welding Nomenclatur Nomenclaturee ,Symbols ,Symbols and Terminology  Terminology  Types ypes Of Welds elds Types Of Joints  Welding  Welding positions positions Description Of widely used processes i.e. 

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SMAW SMAW (Shielded (Shi elded Metal Arc Welding Welding)) GTA GTAW (Gas (Ga s Tungste ungsten n Arc Weldin elding) g)

Codes & Standards

Contents…     

 Welding Inspection  Welding Metallurgy  Mechanical Testing  Welding Defects  Welding Safety 

Defination : 

A union between materials caused by heat, and or pressure

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Bringing two perfectly smooth & clean material surfaces to an intimate contact, which is an atomic distance, is known as welding

Types Of Welding Processes 1. Shielded Metal Arc Welding (SMAW)/Manual Metal 2. 3. 4. 5. 6.

 Arc Welding ( M.M.A ) Metal Inert Gas ( MIG)/Metal Active Gas ( MAG )  Welding Tungsten Inert Gas ( TIG) Welding/Gas Tungsten Arc  Welding (GTAW) Plasma Arc Welding( PAW ) Submerged Arc Welding ( SAW ) Electroslag Welding

Welding Terminology (Butt Weld)

Welding Terminology (Fillet Weld) Leg Height

Face

Leg length Reinforcement

Designed throat  Actual Throat

Welding Terminology (Joint) Angle of bevel* Root face* Included angle*

Root radius*

Root gap*

Welding Symbols

Weld all around

Welding  process

Fillet

Double V

Single bevel

Double U

Single J

Types Of Welds

Butt Weld

Fillet Weld

Spot/Seam Weld

Plug/Slot Weld

Edge Weld

Types Of Joints

Butt joint

T Joint

Lap Joint

Corner Joint

Open Corner Joint

Welding Positions For Plate (Groove)

Welding Positions For Pipe (Groove)

Welding Position for Plate (Fillet) 1F

2F

3F

4F

Welding Position For Pipe (Fillet)

Shielded Metal Arc Welding (SMAW) is a manual arc welding process that uses a consumable electrode coated in flux. Current in the form of either AC or DC from a welding power supply, is used to form an electric arc between the electrode and the metals to be joined. As the weld is laid, the flux coating of the electrode disintegrates, giving off vapors that serve as a Shielding gas and providing a layer of slag, both of which protect the  weldment from air entrapment and slag prevent sudden cooling

Power Source  AC or DC

Advantages & Disadvantages

Gas Tungsten Inert Gas Welding (GTAW) 

is an arc welding process that uses a non consumable tungsten electrode to produce Arc and filler rod is use to make weld. The weld area is protected from atmospheric through inert shielding gas i.e. Argon