L2 Welding Topic 2

Welding level 2 M.J Motaung Downloaded from hlayiso.com

today we are focusing on topic 2: shielded metal arc welding (flat position and horizontal position) unit 1: Describe the shielded metal arc welding (SMAW) process Downloaded from hlayiso.com

Outcomes  Explain the chemical and processes that take place during shielded metal arc welding.  Identify components of the SMAW equipment  Explain the functions of components of the SMAW equipment  Explain the correct setting of the power source  Explain the correct choice of electrode and consequences of incorrect selection of electrode  Explain the size type of welding electrode and welding parameters in relation to thickness of material  Explain the influence of electrode manipulation during the welding process  Explain the flat position and horizontal position in SMAW  Identity the welding characteristics of the carbon steel  Explain the implications of unsafe condition Downloaded from hlayiso.com

LEVEL 2 Poisonous gases produced by welding Carbon monoxide, ozone, phosgene Components of SMAW equipment's SMAW welding machine that supply both ac and dc power as well as SMAW machine that can be switch between the two types of current. Functions of components of the SMAW equipment's Electrode, clamp, welding machine , welding hammer , steel brush Correct setting for power source Which ever welding machine you decide to use, you will have to set it up by attaching the cables attached to the work clamp and electrode to the machine. Correct current selection is very important. Too much current will make electrode over heat and it will easily burn through the material causing spatter Downloaded from hlayiso.com

LEVEL 2 Correct choice of electrode and consequences of incorrect selection of electrode Electrode are manufactured for specific uses with different metals and metals of different thicknesses. It is very important that you choose the correct welding rod or electrode for the job. It is important to use an electrode with the correct chemical properties This is to prevent oxygen contamination and allow the parent material and filler material to mix correctly Welding rods All rods are labelled with code to meet ISO standards Here are some of codes: E6013 –Electrode used for mild steel and general welding E7018 –Low hydrogen electrode for welding high tensile steels The thickness of the rod is also important foe determining the setting of the welding machine Downloaded from hlayiso.com

LEVEL 2 Influence of electrode manipulation during the welding process There are different techniques that should be used to deposit the material into the world stringer bead , smooth straight motion, weave bead, slightly wider ,dragging Downloaded from hlayiso.com

Weld techniques Downloaded from hlayiso.com

LEVEL 2 Flat position and horizontal position in SMAW Three main method of creating welds 1. Vertical 2. horizontal 3. flat position Implications of unsafe conditions Unsafe working area can cause serious accident to fellow workers around you or to your self. PPE is suppose to be worn always Conditions that are unsafe Cable lying across the ground that are not flat can be tripping hazards. Welding in an area with other workers without screens can damage the other workers eyes. Downloaded from hlayiso.com

LEARNING ACTIVITY 1. What is the composition of air ? 2. How does rust form? 3. Name 3 poisonous gases that form during welding? 4. What cause residual stresses in metals after welding? 5. What is the function of welding machine? 6. Which electrode used to weld mild steel? 7. When do you use stringer bead? 8. Give 5 patterns that can be used to make a weave bead? 9. Explain the horizontal position form of welding? 10. Why are low carbon steels important in welding? Downloaded from hlayiso.com

Level 2  In unit 1 the focus was on shielded metal arc welding, equipment, components, parameters and positions  The next presentation we will focus on plan and prepare for the shielded arc welding(SMAW) process PLEASE FEEL FREE TO CONTACT ME ON MY WHATSUP FOR ANY QUESTIONS THAT U MAY HAVE. MY WHATSUP NUMBER IS 0835984175 Downloaded from hlayiso.com