Job Description (JD)
| Nama Program | OPERASI TEKNOLOGI KIMPALAN ARKA [C259-008-3:2025] |
|---|---|
| Kod CU | C259-008-3:2025-C04 |
| Competency | Core |
| Tajuk CU | Perform GTAW 1G, 2G, 3G, 4G, 5G and 6G butt welding (carbon steel), 1G (stainless Steel), 1G (aluminium) |
| Penerangan CU | Perform GTAW 1G, 2G, 3G, 4G, 5G and 6G butt welding (carbon steel), 1G (stainless Steel), 1G (aluminium) describes the competency in joining two pieces of metal end-to-end by applying heat through an electric arc formed between a non-consumable tungsten electrode and the workpieces. This method is particularly effective for creating strong, high-quality welds in various metals, including carbon steel, stainless steel, and aluminum. In GTAW, an inert shielding gas, typically argon or helium, is used to protect the weld area from atmospheric contamination, ensuring that the weld maintains its integrity by preventing oxidation. The tungsten electrode generates the necessary heat without melting, and a filler rod is added to enhance the strength of the joint. In the 1G for butt welding, the workpiece is oriented horizontally, allowing the welder to perform the weld on the upper surface and deposit the weld bead in a straight line, which facilitates better control heat input and achieves strong fusion. In the 2G the workpiece is vertical, and the weld is made horizontally along the joint, requiring skilled control to manage the arc and heat flow to ensure proper penetration and joint integrity while addressing the effects of gravity. The 3G involves positioning the workpiece vertically, where the weld can be executed uphill demanding precise control of the weld pool and heat input for consistent and robust butt welds. In the 4G (Overhead Position), the workpiece remains horizontal while the welding is performed from beneath, requiring the welder to carefully control manage the weld pool to prevent dripping and ensure strong fusion between the pieces. The 5G (Vertical Fixed Position), the pipe is positioned horizontally but fixed so it cannot be rotated. The welder must weld in multiple positions (bottom, sides, and top) as they move around the pipe, with the weld performed in an uphill (vertical up) direction, requiring versatile skills and precise control. Lastly, the 6G (Inclined Fixed Position) involves the pipe is positioned at a 45-degree angle and is fixed with the weld performed in an uphill (vertical up) direction. This position combines all the complexities of welding in multiple orientations (overhead, vertical, horizontal and flat). Welders in this position must demonstrate exceptional skill and control to produce a high-quality weld bead. Additionally, performing 1G (Flat Position) welding on stainless steel allows for good control heat input and weld bead deposition to achieve strong and aesthetically pleasing joints, just as it does for aluminum, where the welder can effectively manage aluminium’s increased thermal conductivity and lower melting temperatures to ensure proper penetration, fusion, and minimal warping or distortion. The person who is competent in this CU should be able to carry out GTAW 1G plate butt welding (carbon steel), carry out GTAW 2G plate butt welding (carbon steel), carry out GTAW 3G plate butt welding (carbon steel), carry out GTAW 4G plate butt welding (carbon steel), carry out GTAW 5G pipe butt welding (carbon steel), carry out GTAW 1G plate butt welding (stainless steel), carry out GTAW 1G plate butt welding (aluminium) and carry out GTAW 6G pipe butt welding (carbon steel). The outcome of this CU is the creation of high-quality welds characterized by structural integrity and uniform, consistent weld beads across all positions. These welds adhere to industry standards and specifications, ensuring they are free from defects such as cracks and porosities. The weld metal produced demonstrates essential properties, including high tensile strength, good ductility, adequate hardness, and impact toughness, which are vital for the durability and reliability of the welded joints. Additionally, proper fusion and penetration are achieved, ensuring a strong bond with the base metal. The ability to perform these welds in various positions (flat, horizontal, vertical, overhead, and inclined) demonstrates the welder's versatility and proficiency, enabling them to handle a wide range of welding scenarios and produce dependable joints in different applications. |
| Tempoh Latihan | 294 |
| Objektif Pembelajaran | The learning outcomes of this competency are to enable the trainees to perform GTAW process in 1G, 2G, 3G, 4G, 5G and 6G butt weld on carbon steel, 1G butt weld on stainless steel and aluminium according to approved Welding Procedure Specification (WPS) and work instruction. Upon completion of this competency unit, trainees should be able to: 1. Carry out GTAW 1G plate butt welding (carbon steel). 2. Carry out GTAW 2G plate butt welding (carbon steel). 3. Carry out GTAW 3G plate butt welding – uphill (carbon steel). 4. Carry out GTAW 4G plate butt welding (carbon steel). 5. Carry out GTAW 5G pipe butt welding – uphill (carbon steel). 6. Carry out GTAW 6G pipe butt welding (carbon steel). 7. Carry out GTAW 1G plate butt welding (stainless steel). 8. Carry out GTAW 1G plate butt welding (aluminium). |
| Pra-Syarat | Not Available |