They are kind of a bridge tack. On smaller pipe you just put bridge tacks with MIG without the round bar because you can keep the weld away from the edge of the bevel. The round bar bridge tacks are always done with 7018.
That bicycle must be a poor mans weld tractor. You hold the flux-core gun in one hand and pedal the bike the opposite way while turning the pipe. See we can learn something from Hamsters. LoL