principles of welding.pptx

for learning

1. REVIEW WHAT IS WELDING? Its is a process to joining two metal using SMAW Welding or Melted Electrode What are the advantage of SMAW process? Answer: Equipment used is simple, inexpensive and portable Electrode provides and regulates own flux Lower sensitivity to wind and drafts than gas shielded welding process All position capability . What are the disadvantages or limitations of SMAW process? Answer: It require des-lagging after each weld Welding must be stopped after each electrode it forms harmful fumes during welding

2. What are the types of welding machines that can be used for shielded metal Arc Welding process? Answer: Transformer type Rectifier-rectifier type Generator type Inverter type How would you prevent the occurrence of slag inclusion? Answer: Clean the base metal (remove paint, oil etc.) Remove slag before re-starting welding What is the cause of poor penetration and incomplete fusion? to low welding current Incorrect electrode angle What causes warpage or distortion? Answer: wrong joint preparation incorrect welding techniques use of high amperage improper bead size/profile wrong choice of diameter electrodes

3. How would you avoid electric shock during welding? Answer: Ground all electrical equipment and the work piece Use the recommended cable size Make sure all electrical connections are tight, clean and dry Keep work cables and connectors in god condition at all times Keep cables and connectors in good condition at all times Wear insulated gloves when adjusting equipment Follow safety standards . What are the welding parameters that must be considered to produce quality weld? Answer: Current setting Length of arc Angle of electrode Manipulation of weld (weave or stringer) Speed travel

4. USES AND IMAGE OF THE DIFFERENTS PART OF SMAW PROCESS ELECTRODE HOLDER used to guide the electrode over the weld joint and feed the electrode over the weld joint and feed the electrode into the weld puddle as it  is consumed

5. USES AND IMAGE OF THE DIFERENTS PART OF SMAW PROCESS GROUND CLAMPS used to connect the ground cable to the work piece

6. USES AND IMAGE OF THE DIFERENTS PART OF SMAW PROCESS ELECTRODE used in different battery types, electroplating and electrolysis, welding, cathodic protection, membrane electrode assembly THERE ARE 3 PARTS OF ELECTRODE FLUX COATING/ COVER TIP OF ELECTRODE CORE WIRE

7. USES AND IMAGE OF THE DIFERENTS PART OF SMAW PROCESS WELDING MACHINE A welding machine is a device used to join materials together

8. Operating principle Of SMAW

9. THE DIFFERENT TYPES OF WELDING POSITION IN PLATE AND PIPES 1 GROOVE WELD 2. FILLET WELD