Kemppi Max WeldClean Multi Large Parts FAQs
Practical answers on the brushes, sleeves, bushes, adaptors, fluid and containers used with large-head electrochemical weld cleaning attachments.
How does an electrochemical weld cleaning brush work?
A carbon fibre brush carries electric current into the weld area while it is kept wet with a cleaning fluid, normally a phosphoric acid solution. The current and fluid together remove the heat tint and oxide left by welding on stainless steel, which helps restore corrosion resistance. The brush is the part that touches the work, so it is the main wearing part.
The brush and the surface must both stay moist. In some systems, the power cuts out automatically if the brush lifts off the work, which helps prevent burn marks. Always follow the instructions for your particular cleaning system.
Why do the brush, sleeve and adaptor have to match my cleaning head?
Weld cleaning attachments are made in more than one head size, and the brush, sleeve kit and adaptor are made for a particular size, so a part for one size will not necessarily fit or work on another. Larger heads also commonly run at higher current settings than smaller ones, so the right part matters for both fit and electrical contact.
Check the attachment's manual or parts diagram and the markings on the old part before ordering. Compare the head size, how the brush is held and the thread or fitting type. If you are unsure, our team can help you work out which part you need.
Why must the brush stay wet and in contact with the metal?
The cleaning action needs both the fluid and the current. Keep the brush and the surface moist throughout cleaning, and keep the brush on the workpiece. In some systems, if the brush lifts off, the power cuts out automatically to prevent burn marks, and re-applying the brush restores it within a short time.
A dry brush can also scorch and wear faster, so re-dip it often and work steadily along the seam. If the finish looks patchy or burnt, check that the brush is wet, seated properly and making full contact.
What is the cleaning fluid and what safety precautions does it need?
Weld cleaning fluids are commonly a phosphoric acid solution, chosen to suit the job. They are acidic, so follow the safety data sheet for the product. Wear eye, face and hand protection, including chemical-resistant gloves, work in good ventilation and use respiratory protection where needed.
Treat the fluid as a hazardous substance. Suppliers generally provide a safety data sheet, and your chemical risk assessment should cover use, spills and first aid. Never mix it with other chemicals.