Kemppi Minarc T 223 ACDC Operating Manual

Minarc T 223 ACDCOperating manual - EN3.5 Cleaning and polishing weldCleaning and polishing processes are used to restore the corrosion protection of stainless steel welds. These processesinvolve removing contaminants and correcting discoloration on the weld seams.The cleaning process uses AC current and is more efficient of the two. The polishing process uses DC- current.The 2T and 4T trigger logic functions as well as memory channels are available with the cleaning and polishing pro-cesses.Pay attention to your own safety and the safety of others in the work environment.Ensure proper ventilation and use personal respiratory protection.Wear suitable protective clothing, including eye, face and hand protection. Use protective gloves that are specificallydesigned for handling chemicals, such as phosphoric acids, and that comply with the EN ISO 374-1:2016 standard.Also, follow the safety guidelines and recommendations provided by the manufacturer of the chemicals you use.Always check before use that earth return lead/clamp and mains cable are in serviceable condition. Ensure that theconnectors are correctly fastened.Choose the cleaning liquid (e.g., 10...60 % phosphoric acid) and the neutralization liquid (e.g., water) based on theapplication.To clean/polish a weld:1. Attach Kemppi's MAX WeldClean cleaning tool to a TIG welding torch body (for more information, refer to KemppiUserdoc).2. Close the shielding gas valve.3. Ensure that the earth return cable is connected to the power source and work piece.4. Select the cleaning or polishing process by pressing the process button in the control panel (refer to "Minarc T 223ACDC control panel" on page 28).5. Adjust the current by turning the control knob or by using a remote control.The default current for cleaning and polishing is 25 A. With the L-size cleaning tool, a good starting point for findinga suitable current is 50 A. In general, the current is suitable when the cleaning is relatively fast and the formation offumes is low.6. Dip the brush into the cleaning liquid. Ensure that both the brush and the surface to be cleaned are sufficientlymoist throughout the cleaning process.7. Apply the brush to the work piece and ignite the current by pressing the ON/OFF switch on the torch handle.8. Choose the cleaning technique based on the application. However, always ensure that the brush does not come offthe work piece during cleaning.If the brush comes off the work piece, an automatic power cutoff is activated to prevent burn marks. If you apply thebrush to the workpiece again within 10 seconds, the power is automatically restored.9. Turn off the current and lift the brush away from the work piece.10. Finally, neutralize the cleaned area with a neutralization liquid and wipe dry.© Kemppi 42 1922350 / 2413