There were many who blamed the Beatles' end on the machinations of Yoko Ono, the legendary love of John Lennon's life, and on the deviousness of Allen Klein, the band's new manager who was also a favorite of Lennon's, but whom McCartney could not abide. But it wasn't that simple.
The apparatus used in gas welding consists basically of an oxygen source and a fuel gas source (usually cylinders), two pressure regulators and two flexible hoses (one of each for each cylinder), and a torch. This sort of torch can also be used for soldering and brazing.
Hot gas welding, also known as hot air welding, is a plastic welding technique using heat. A specially designed heat gun, called a hot air welder, produces a jet of hot air that softens both the parts to be joined and a plastic filler rod, all of which must be of the same or a very similar plastic. (Welding PVC to acrylic is an exception to this rule.)