Как приварить точёную петлю правильно и не правильно

Two options for positioning a turned loop during welding are shown: how to weld a loop correctly and how to weld a loop incorrectly.
It is clearly shown what happens in the absence of gaps and how gaps affect the operation of a welded turned loop (canopy).
Experience with heating one part of the loop to 800 degrees Celsius and turning the second part to check for "jamming".
An example of setting the gap using matches and a spiral.
The easiest and fastest way to position hinges (awnings) strictly parallel to each other and the swing wing at the same time.
I suggest looking in more detail in a spiral: https://youtu.be/zU3Y-eQ7ZYU