1. Clean the Welding Path: Ensure the welding path for vertical welding is thoroughly cleaned, paying attention to removing any grease, residual welding flux, or water residue.
  2. Determining Welding Angle: Know the required welding angle beforehand and establish a standard angle for welding. It’s crucial to weld from bottom to top for high-quality welding.
  3. Arc Initiation and Welding Technique:
    • Begin by initiating the arc from one side of the standard angle. While oscillating the welding wire left and right, ensure it remains within the melting pool range. Pause briefly on each side during oscillation, adjusting the duration based on the welding angle. For larger welding angles, consider multiple passes. Control the pace of oscillation and ensure stable hand movement for optimal results.
  4. Transitioning Past Positioning Points:
    • Use either the direct transition method or the spot welding transition method when reaching positioning points. In the direct transition method, swiftly oscillate upwards without pausing in the middle. Alternatively, with the spot welding transition method, pause briefly while oscillating left and right until past the positioning points.
  5. Finishing the Weld:
    • Upon completing the weld, ensure any voids in the weld pool are filled with spot welding.
  6. Special Techniques for Vertical Welding:
    • For uphill welding with small welding angles, direct upward welding without oscillation is possible but requires advanced skills.
  7. Welding Technique:
    • Maintain the optimal angle for upward welding as depicted in the image.
  1. When welding vertically upwards, ensure a slightly lower current than flat welding to prevent excessive penetration and control the oscillation frequency to prevent the molten metal from flowing downward.
  2. Oscillation Pattern:
    • Adjust the oscillation pattern based on the desired weld width. For narrower welds, use a small oscillation pattern to concentrate heat, while for larger welds, utilize a wider oscillation pattern to prevent undercutting. Avoid using a concave oscillation pattern, as it may lead to poor weld formation.
  3. Image and Welding Effect Demonstration:
    • Provide visual aids and demonstrations of the welding machine and welding techniques as described above.


  • Mastering vertical welding techniques with a CO2 gas shielded welding machine requires practice and skill. Follow these steps meticulously for successful and high-quality vertical welds.

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