@book{1052,
	author = {National Instructional Media Institute (NIMI) and DGT, MSDE, Govt of India},
	title = {Welder 1st  Semester : Trade Theory},
	publisher = {National Instructional Media Institute (NIMI)},
	year = {2016,c2014},
	address = {Chennai},
	note = {Contents :

Module 1 : Fitting & Sheet Metal 

-General discipline in the institute
-Hand tools
-Grinder pedastal and Bench 
-Hacksaw frames and blades 
-Files-Grades and specification
-Sheet metal shop safety rules 
-Rivets and Riveting

Module 2 : Gas Cutting 

-History of welding 
-Principle of gas cutting and application 
-Different type of common faults in gas cutting 

Module 3 : Gas Welding 

-Chemistry of oxy-acetylene flame 
-Gases used for welding and gas flame combinations
-Properties of metals
-Production of calcium carbide 
-Carbide to water type acetylene gas generator
-Acetylene gas purifier 
-Oxygen gas -Properties and Production 
Oxygen gas cylinder 
-Safety rules for gas cylinders 
-Welding regulator 
-Rightward technique of oxy-acetylene gas welding 
-Faults in gas cutting
-Filler rods used in gas welding 
-Flashback and backfire 
-Gas welding Fluxes and Function 
-Welding of aluminium and its alloys 
-Stainless steel-Properties -types and weld ability 
-Welding of brass
-Cast Iron -Properties-type and weld ability 


-Module 4: Arc Welding 

-Introduction to welding (fusion, non-fusion and pressure 
-Arc welding Accessories 
Welding terms & its Definition 
-Shielded Metal Arc Welding 
-Methods of cleaning the base metals before welding 
-Basic welding joints and weld 
-Arc length and its effects 
-Basic welding positions
-Arc welding machines
-AC/DC welding rectifier its construction 
-Power source selection criteria
-Inverters 
-Arc blow its Causes and Remedial Measures 
-Distortion and its control 
-Defect in Arc welding -its effort
-Arc welding electrodes 
-Composition /Characteristics Flux
-Sizes of Mild steel Electrodes
-Choice and storage of electrodes 
-Coding of electrodes as per BIS,AWS and BS153
-Weld symbol and welding symbol -Description and use 
-Stainless steel welding ,Procedure and defects
-Heat treatment 

Module 5: Metallic Arc cutting and Gouging 
-Metallic arc cutting and gouging  
}
}