OK guys, dumb question time. First, a little backstory. My basket bike (early 2000s Rigid MTB) has garbage wheels on it and v-brakes. I have dick brakes and Motorbacon is building up some dick brake wheels for me next week-ish. I was planning on re-learning how to not burn holes with a tig and weld on some dick brake tabs with that sometime over the spring or summer. I’d also like to re-rake the pokes at the same time to avoid any potential misalignment.
So here’s where I run into trouble, the garbage wheels are dying, the front rim’s seam is coming apart and causing the wheel to loose tension. So, I’d like to push my plans forward to the next few weeks. I do not have time to practice my tig skills nor do I have access to an oxy/acetylene rig. I also do not have the budget to buy any new equipment for this adventure.
In the past I’ve used a mig with gas to stitch stupid stuff like this to heavy wall cromo bikes with great success, just stacking tack welds to keep from burning through but still getting full penetration. My plan is to mig stitch on the dick brake tabs and a seatstay/chainstay brace and then a mapp torch to braze on some of those zip tie hose holder things.
I know this less than ideal method of welding will work, but I’m not quite sure exactly how I should weld the tabs on. My plans are to use this tab for the front to spread the load out across the fork leg and this tab out back with a round steel brace between the stays. Now, for the brace I know I should weld all the way around it. But for the tabs I’ve seen them welded across their whole length and I’ve also seen them stitched on with several ~1/2" welds spaced out across its length. I like the idea of several smaller welds spaced out, is there any benefit to either method? Especially considering the porous nature of mig welding, which should I use?
Now, for brazing on the hose holders, what type of filler should I use? I’ve read that silver is preferred for this. I haven’t seen silver at the hardware store, if I could find some locally is that the right stuff or is there some bike specific stuff I need? I have both mapp and propane with those little adjustable flame torch heads like this:
Which gas should I use? And Flux?