Not a ham question but this is a kind of radio theory problem.

What kind of pattern of cables or threads becomes a coil?

I have a 4 meter (12 feet) long welding cable that is turned around of flexible hose that has 16 millimeter (5/8") diameter. Maximum current in the cable is 250 Amps DC. Frequency is unknown since the voltage source is inverter type and there is 15 rounds around the flexible hose. Cross section area of the hose is of course one thousandth of that which occurs between a ground cable and the welding cable but it still feels uncanny to use coiled cable in this kind of purpose. Coiled cable makes the welding hose flexible and ergonomic to use and easier to store than a straight cable one.

Pic has 4 different ways to tie the thread around the hose. Uppermost pattern is worst coil in this case but is there any difference between that and the second and the third patterns when it comes to magnetic field strength? Lowest of the patterns should reverse magnetic field as it induces two fields against each other.

>inb4 buy a ready cable
I should buy a ready mag welder but I need a compact one since I have no room for old big one.