Course contents
§ Construction and maintenance of MMA welding equipment & typical parameters
§ Covered electrodes
§ Health and safety
§ AC and DC.
§ Study of 'electric arc' and its characteristics.
§ The AC transformer; windings, core, temperature rise and control
§ Primary and secondary circuits; mains protection
§ Relationship between arc voltage and welding current; power source characteristics.
§ Control of welding current, instruments to be used and validation of measuring instruments
§ Power sources for DC welding
§ Arc starting aids
§ Earthing arrangements, cables, electrode holders
§ Maintenance of equipment; condition of cables and connections; cleanliness of contact faces; cleanliness of internal components
§ Checking for safe operation
§ Typical welding parameters and selection of electrode type and size.
§ Weld imperfections and possible problems specific to MMA welding.
§ Practical training on different positions |