HOW TO REMOVE A BROKEN BOLT: EFFECTIVE METHOD
1. Prepare the Work Area
First, ensure the cavity is clean and free from any oily substances. Proper cleaning helps the welding process adhere better and improves effectiveness.
2. Choose the Right Electrode
For a 10 mm (3/8’’) hole, use a small-diameter electrode, like a 2.5 mm (3/32’’) one. This size allows you to deposit metal at the center of the bolt without damaging the threads.
Tip: Insert the electrode into the hole and keep it centered to avoid fusing with the threads.
3. Strike the Electrode
Strike the electrode on the top of the broken bolt to initiate the arc. Keep the arc centered in the molten pool, allowing the electrode's special slag to flow down the threads and protect them from the molten metal.
4. Create a Handle for Removal
When the molten pool slightly exceeds the hole's edge, let it cool. Remove the solidified slag, then weld a new bolt on top of the weld bead. This new bolt will serve as a handle to unscrew the broken one using a wrench or pliers.
Note: Allow the metal to cool before unscrewing. As the metal contracts, it helps loosen the broken bolt.
5. Extra Protection for Threads
If you’re worried about accidental arc strikes on the threads and if the hole diameter allows, place a piece of copper tubing inside to shield the threads.
With this method, you can easily remove a broken bolt without damaging the threads. The Sodel 330 / Sodel 335 electrode ensures a precise and effective removal process.
If you need assistance with removing a broken bolt or would like personalized advice for your welding projects, don’t hesitate to contact us. Our experts are ready to provide tailored solutions to ensure high-quality work.
See the video of the application