3M stainless steel weld repair Benutzerhandbuch
Step 1 - Leveling the Weld
Use a 3M
™
Fibre Disc 785C on a right angle grinder to level the weld and leave fine grind lines.
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Grade 60 is a good starting point, but use the finest grade of abrasive available that still gets the job done, because finer
grind lines are easier to remove.
grind lines are easier to remove.
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For a 7" fibre disc, optimum tool speed is 4500 rpm.
TECH TIP: Try to align the grind line scratches with the grain line direction of the original stock. Perpendicular scratches
are more difficult to blend into the final finish, while parallel scratches blend easily during the finishing.
Accessories:
3M
™
Disc Pad Face Plate - Ribbed, 7" diameter (051144-80515)
3M
™
Disc Pad Hub, 4 ½" diameter (051144-45109)
Note: Additional accessories are available for a wide variety of grinders. Refer to the Industrial Products for Stainless Steel
catalog, page 11 for more information.
Step 2 - Setting the Grain
Set the directional grain line with a 3M
™
Belt 777F. Use a portable tool with a pneumatic wheel.
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Grade P120 is a good starting point, but be careful when selecting the abrasive grade, as severe grind lines will result in
more conditioning time and reduced productivity.
more conditioning time and reduced productivity.
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For a 5" diameter pneumatic wheel, an optimum tool speed for coated abrasives is 2000 rpm.
TECH TIP: Attempt to stay as close as possible to the weld area to minimize final blending.
Step 3 - Final Finishing
Refine the surface with a Scotch-Brite™ Surface Conditioning Belt Type A CRS for a #3 finish, or Type S MED or A MED
for a #4 finish. As in step 2, use a portable tool with a pneumatic wheel.
for a #4 finish. As in step 2, use a portable tool with a pneumatic wheel.
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Finish a small area on the corner of the piece. Examine the finish from several angles. The match, while not exact, will be
close. With a little practice you can "feather" in and out of the repair area.
close. With a little practice you can "feather" in and out of the repair area.
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A few slow passes should restore the finish. Use the longest stroke that is comfortable. Working with grain, ease off
pressure on both ends of the stroke.
pressure on both ends of the stroke.
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For a 5" diameter pneumatic wheel, an optimum tool speed for surface conditioning belts is 1000 rpm.
Scotch Brite hand pads, such as 7446, are commonly used as a last step in conditioning surfaces, blending transition lines,
and masking any remaining blemishes. 3M™ Stainless Steel Cleaner removes debris and streaks, resists fingerprints and
masks blemishes.
masks blemishes.
TECH TIP: A few slow passes should restore the finish. Use the longest stroke that is comfortable. Working with grain,
ease off pressure on both ends of the stroke.
Accessories:
Scotch-Brite pad holder No. 961 (048011-09493)
For more information
Contact the Customer Response Center at 1-866-279-1235.
Market: Metal Fabrication
Application Description: Weld repair and setting #3 and #4 finishes
Application Description: Weld repair and setting #3 and #4 finishes
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