eh? that certainly looks like aluminium brazing with gas torche
as well.
yeah, welding is best. As Jim mentioned, some alloys can't be welded at all. Although those are high-strength, fatigue-resistant versions we're not likely to find laying around. Mainly used for aircraft, aerospace and military applications.
OP hasn't fully optimised brazed joint yet. For this footpeg application, it should be more than adequate.
For even more strength, after joining 2 halves, I would install 2" long 1/2" alloy tube underneath peg and braze that on along outer edges as well.
Link to original page on YouTube.