flyrotary@lancaironline.net Mailing List Archive

Hi Bryan, No I clean the machined area (recess into casting), clean the end of the aluminum tube well, set the tube down in the recess and braze. Use a high BTU flow propane torch for best results - something around 50,000 BTU. Heat the casting not the tube and when you think you are close just "scratch" one of the rods across the casting - when it starts to melt you are ready to braze the tubes - which will certainly be hot enough. There is no bead inside (but you would want to check that some did not run between outer wall of tube and casting and form a drop). It really sort of acts like solder and gets drawn down into the recess by capillary action (I assume). There is a small area where the braze rises up to meet the tube around the mating area and leaves a nice, smooth interface. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bryan Winberry Sent: Monday, April 27, 2009 10:09 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Brazing vs Epoxies : [FlyRotary] Re: Epoxies vs welding Thanks Ed, I may have to get my welding feet wet with the HTS-2000. Doesn't sound like it would be an expensive experiment. And if I can make it work, I'd save quite a bit of $$. BW Did you have to smooth the inside of your runners? Or a better way of asking is, does this stuff form a bead similar to a weld that needs to be cleaned up for smooth air flow? -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson Sent: Monday, April 27, 2009 9:19 PM To: Rotary motors in aircraft Subject: [FlyRotary] Brazing vs Epoxies : [FlyRotary] Re: Epoxies vs welding Hi Bryan, Not being a welder, I was searching for some means of securing my tubes to some of the stock manifold castings I had machined for them. JB Weld is great stuff, but I just never felt confident enough in it to hold things like that together. I tried several aluminum brazing rods and really had no success (surely my fault - other's must have), but I found an HTS-2000 supposedly 2nd generation rod and it worked great for me. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bryan Winberry Sent: Monday, April 27, 2009 8:34 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Epoxies vs welding Thanks Al, I was thinking of an application like holding seated runners in the machined manifold. Or possibly joining tubing together. The ability to contour and smooth this product would seem suited here where air flow is an issue. But I don't know if it would stand up to all the rigors (vibration, heat, etc.) Just throwing it out there since JB Weld is smoothing the ports on several intakes out there. Bryan -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Monday, April 27, 2009 2:25 AM To: Rotary motors in aircraft Subject: [FlyRotary] Epoxies vs welding On another note, has anyone contemplated using the two part puttys in areas like intake manifold construction. I saw some in HD that claims good for temps up to 450. I'm hesitant, but this stuff seems to be a cousin to JB Weld. Bryan JB weld ( and similar) is wonderful stuff that adheres to almost anything, and is amazingly strong. So if need things to hold together and make a good seal - great. But if you need real strength, anything that just adheres to the surface is not going to be as strong as a good weld. So consider your application, and what it has to do, and then decide. FWIW, Al G -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com