Page 15 - CITS - Welder - Trade Theory

WELDER - CITS

Disadvantages of welding
Although disadvantages of welding are minimum in Comparison to advantages but still some of disadvantages.
are listed below:

1 The ultra-violet rays and Infrared says of welding arc are too much harmful for the eyes.
2 The flames and gases are harmful for the human being.
3 There are more stress and distortion in the Jobs done by welding.
4 For having good weld, the operator must be a skilled one otherwise the Job once spoiled cannot be rectified.
5 Welded Joint must be stress relieved.

Course Objective

Objectives: At the end of this lesson you shall be able to
• state and understand course Objective in the CITS training program.

Sl Course Objective Remark
No. (At the end of the theory we shall be able to)

1 Importance of Welding in Industry
2 Safety precautions in SMAW, OAW and OAGC
3 Introduction of Arc, Gas and other welding process ,Oxy-Acetylene
gas cutting, faults in cutting.
4 Basic electricity, Heat and temperature ,Principle of arc welding,
Types of weld joints. Edge preparation.
5 AC welding Transformer, DC welding Motor generator set, Welding
Rectifier and inverter type welding machines.
6 Arc length, Welding position. Polarity.
7 Arc blow, Distortion, Arc Welding defects.
8 Common gases used in Gas welding and cutting. Chemistry of Oxy-Acetylene
flame. Types of Oxy- Acetylene flame .
9 Calcium carbide. Acetylene, Purifier, Hydraulic back pressure valve and
Flash back arrestor.
10 Oxygen, Oxygen and Acetylene gas cylinders, Colour coding, safe handling and
storage, regulator, Gas welding and cutting blow pipe.
11 Gas welding techniques, filler rods, fluxes, defects, causes and remedies

12 Classification ,Aluminum, Copper - types- properties and welding methods.
13 Brass - types - properties Stainless steel - types- weld decay
14 Development drawings for pipe Elbow joint. ‘T’ Joint. ‘Y’ Joints.
15 Electrode types, functions of flux, Coding of electrode as per IS and AWS.

16 Brazing, filler rods and fluxes, necessity of cleaning, brazing parameters.
17 Pipe & plate pipe welding. Pipe schedule.
18 Pipe welding procedure uphill , downhill and horizontal welding Pipe welding
position 1G, 2G, 5G & 6G
19 Procedure for welding heavy wall pipes in 5G & 6G position welding
20 Importance of pre heating, post heating, inter pass temperature.

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CITS : C G & M - Welder - Lesson 1-3