21st March 2017, 12:20 AM
Fillets that look like welding
I know fillets that look smooth are cool and all, but I kind of like the look of a good weld bead on metal. Anyone know of good techniques for doing this with glue or epoxy?
Sent from my iPhone using Tapatalk Pro
21st March 2017, 12:53 AM
Use something thick like TB M&T (NRND). Lay it down with a proper welding motion & it should stay put.
21st March 2017, 01:09 AM
Or, if your using Rocketpoxy or Proline 4500, when the resin gets to the stiff stage when you would normally pull your fillets smooth, use a little motion and it should make a pattern. Probably take a little practice. I agree, it would probably look cool. Especially if you were doing a steampunk model...
jd2cylman@mchsi (dot) com
NAR 73787 L3
Tripoli 13524 L3
QCRS, Princeton, IL
Chicago Rocket Mafia "The Mechanic"
Buckle up back there, we're going into "Hyperactive!"
21st March 2017, 01:27 AM
This is the approach I would probably use, at least on a larger bird. On a smaller one, it could work, but too much effort in most cases.
First make a paper or cardstock connector, or mask off an area around where the fillet will be (to simulate the area around the weld that gets oxidized and raised, no idea what it's called) and put glue or something into it. Peel off tape after the glue thickens enough to keep shape.
Then cut or punch out some cardstock or thick paper circles.
Lay down a fillet, probably with thick glue.
Glue the bottoms of the paper disks and lay (overlapping) onto joint.
Sand to round edges some and slightly fill in the crevices with a small amount of wood glue or CWF or something. Also to finish the beginning and end of the weld.
I dont think the pattern can be pulled because the beads are oriented so the round part overlaps the previous bead rather than there being a round indentation. With enough skill, it could likely be made to work, but not here.
I hope to try this out soon. Thanks for the idea!
21st March 2017, 01:41 AM
Alternatively you might be able to find fabric or something to simulate weaved beads or even the normaller kind to lay on top of a normal fillet.
21st March 2017, 01:56 AM
A stirring/swirling motion while the epoxy is still semi liquid but wont settle too much would probably give the proper effect. Stirrer could be a bamboo skewer.
21st March 2017, 03:47 AM
I think I would put thickened epoxy in a syringe and do a back and forth motion.
I might even try doing a normal fillet and when it is dry use paintable caulk in a syringe. Use the same back and forth method.
I wish I could describe the motion better.
21st March 2017, 05:11 AM
Maybe lay a weld on metal, then create a silicone mold of it that you press into the epoxy and let it dry.
NAR # 99006
Level 1 6-7-15 - Madcow Tomach
Level 2 6-18-16 - Madcow Tomach
Total 2015 Ns - 960.1
Total 2016 Ns - 4212.7
Total 2017 Ns - 79.56
21st March 2017, 08:57 PM
If you use a combination of a thixotropic agent like fumed silica and a filler like microballoons you should be able to do the pattern when you lay it down when it's still wet. The silica will keep the epoxy from slumping. I've been using 10/5/.3 epoxy/filler/silica ratio and it's been working out good.
TRA #10518 ---- MDRA #172
L1, 6/25/2016: Modified MadCow Super Batray, CTI I236 BS
L2, 9/17/2016: Modified RW Patriot, CTI J280 SS
L3, Pending - LDRS: RW Formula 200, CTI M1560
Max Altitude: 3,235', L1 Cert flight
Max Speed: Mach ???, L1 Cert flight
21st March 2017, 09:10 PM
Maybe balls of epoxy clay pressed into place over a prexisting fillet and smoothed?
21st March 2017, 09:33 PM
This is what type of weld look you are looking for....
TRA 7299 L3, NAR 83701 L3
Maryland Delaware-Rocketry Assoc.
Lvl 1- AT H220--Lvl 2- AT J350--Lvl 3- AT M1297
25th March 2017, 05:10 PM
25th March 2017, 05:12 PM
Agreed, I think it will take a few attempts, but laying down some epoxy and letting firm up just a bit and then doing some sort of tamp or pull technique will probably give me a close enough effect. Now I just need a new bigger rocket to try this on. I just got one of my daughters a mini cowabunga, that I might be able to experiment on.
25th March 2017, 06:07 PM
I've seen plenty that looked like welding, but I don't think it was on purpose
25th March 2017, 06:15 PM
Fillets that look like welding
This is possible, but boy, you'd have to have perfect timing so you had no stickiness fairly deep into the cured surface.
Originally Posted by jd2cylman
I'd probably go with epoxy clay and roll out little extended football shapes then lay into fin joint and tamp down carefully.
25th March 2017, 06:25 PM
That is a great idea too. Thanks. Keep'em coming.
Originally Posted by dixontj93060
By Winston in forum The Watering Hole
Last Post: 17th August 2015, 11:44 PM
By Shade in forum The Watering Hole
Last Post: 31st July 2015, 09:50 AM
By THarrison in forum Techniques
Last Post: 24th December 2011, 09:17 PM
By vinnys 1st mpr in forum Ground Support
Last Post: 2nd July 2011, 07:05 AM
By bguffer in forum Recovery
Last Post: 8th September 2009, 01:23 PM