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In this section we will talk about line-boring and bore welding. This is a process used to repair worn out holes on heavy equipment and machinery. This can be a very costly repair for any company. This should not be a necessary repair it normally happens because of neglect or poor maintenance. Whatever the reason there are a few company's in the area that can and will repair on site or in there facility.
Steps to getting started
Steps to getting started
Step 1. Assessing the damaged bore to determine what the best repair will be. Does it need hand welded before trying to center the bar? Do you need to grind edges down for centering cones to fit properly?
Step 2. Centering the bar in the bore. To do a proper repair you MUST get the bar perfectly centered in the bore. It must match the factory center line or you WILL have alignment issues. This is probably the most difficult part of the process. It can take several hours to complete but it is that important and will make the rest of the job easier.
Step 3. Cut the hole round. If you have it perfectly centered in the bore go ahead and start to make cuts to make the hole round. By doing this it will remove any dirt grease or hardened material out of the bore before welding.
Step 4. After you have the bore cut so it is round. Measure the bore to see how much weld will be required to bring it back to factory spec. You don't want to weld too much and you don't want too little weld in the bore. Welding too much is a waste of time, material and wear on your equipment. Too little of weld will result in grooves in the finish and a loose fit for replacement bearing or pin.
Step 5. Start to weld the hole either with an automatic bore welder or by hand. An automatic bore welder will save time and is more consistent than hand welding. Make sure to turn the shielding gas on then start the welding process. Most of the time 2-3 passes with a bore welder will be sufficient.
Step 6. Insert the boring bar back in the hole. Set cutter to remove about .050 of material. after you have made that pass measure to see how much material must still be removed. Set cutter to remove a maximum of .050 at a time until you reach the desired finish size.
Step 2. Centering the bar in the bore. To do a proper repair you MUST get the bar perfectly centered in the bore. It must match the factory center line or you WILL have alignment issues. This is probably the most difficult part of the process. It can take several hours to complete but it is that important and will make the rest of the job easier.
Step 3. Cut the hole round. If you have it perfectly centered in the bore go ahead and start to make cuts to make the hole round. By doing this it will remove any dirt grease or hardened material out of the bore before welding.
Step 4. After you have the bore cut so it is round. Measure the bore to see how much weld will be required to bring it back to factory spec. You don't want to weld too much and you don't want too little weld in the bore. Welding too much is a waste of time, material and wear on your equipment. Too little of weld will result in grooves in the finish and a loose fit for replacement bearing or pin.
Step 5. Start to weld the hole either with an automatic bore welder or by hand. An automatic bore welder will save time and is more consistent than hand welding. Make sure to turn the shielding gas on then start the welding process. Most of the time 2-3 passes with a bore welder will be sufficient.
Step 6. Insert the boring bar back in the hole. Set cutter to remove about .050 of material. after you have made that pass measure to see how much material must still be removed. Set cutter to remove a maximum of .050 at a time until you reach the desired finish size.
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