Decreased accuracy of the welding platform? Detailed explanation of the 3-step technique for repairing the scraped surface of cast iron plates
The welding platform is an indispensable reference equipment in welding operations, and the accuracy of its scraped surface directly affects the quality of welded workpieces. However, during long-term use, due to frequent placement of workpieces, spatter from welding sparks, and external collisions, the scraped surface of the welding platform is prone to wear, scratches, and other issues, leading to a decline in accuracy. Once the accuracy falls below the standard, it may cause dimensional deviations in welded workpieces and inaccuracies in welding positions. Don’t worry, below we will provide a detailed introduction to the 3-step technique for repairing the scraped surface of cast iron plates, helping to restore the accuracy of the welding platform.

Step 1: Surface Cleaning and Damage Assessment
The first step in the repair work is to clean and assess the damage to the scraped surface of the welding platform. First, use a brush or compressed air to remove dust, iron chips, and other debris from the platform surface. Then, wipe the surface with a cloth soaked in alcohol or a cleaning agent to remove oil stains and dirt, ensuring the surface is clean and free of impurities.
Next, carefully inspect the damage to the scraped surface. Observe whether there are scratches, pits, worn areas, etc., and use precision measuring tools (such as dial indicators and straightedges) to measure the depth and extent of the worn areas to determine the severity of the damage. For minor scratches and wear, proceed directly to the subsequent steps. For deeper pits or large areas of wear, filling treatment may be required first.
Step 2: Grinding Treatment of the Scraped Surface
Based on the damage assessment results, perform grinding treatment on the scraped surface. For surfaces with minor damage, use grinding paste and grinding tools for manual grinding. Select a grinding paste that matches the material of the platform (such as chromium oxide grinding paste), apply it evenly to the scraped surface, and then use a flat grinding tool (such as a cast iron grinding plate) to grind in a figure-eight or straight reciprocating motion. During the grinding process, control the grinding force and speed to avoid over-grinding and causing new damage.
For areas with deeper scratches or pits, start with an oilstone for rough grinding to level the protruding parts, then use fine grinding paste for precision grinding to gradually restore the surface to flatness. Throughout the grinding process, continuously check the accuracy of the ground surface with a straightedge and feeler gauge to ensure the flatness of the ground surface meets the requirements.
Step 3: Precision Inspection and Fine-Tuning
After grinding is completed, the scraped surface of the welding platform needs to undergo precision inspection. Use measuring tools such as levels and dial indicators to test the flatness, straightness, and other indicators of the platform according to relevant accuracy standards. Compare the test results with the platform’s rated accuracy. If they do not meet the requirements, fine-tuning is necessary.
During fine-tuning, perform precise grinding on areas where the accuracy exceeds the tolerance until all accuracy indicators of the platform meet the specified standards. Finally, clean the platform surface again to remove impurities generated during the grinding process, and then apply a layer of anti-rust oil to prevent surface rust.
A decrease in the accuracy of the welding platform is not a cause for alarm. Through the above 3-step technique—surface cleaning and damage assessment, grinding treatment of the scraped surface, and precision inspection and fine-tuning—the scraped surface of the cast iron plate can be repaired, restoring the platform’s accuracy. During the repair process, be patient and meticulous, strictly following operational standards to ensure the effectiveness of the repair. Regular maintenance of the welding platform can extend its service life and ensure the quality of welding operations.