Our front bi-fold metal gate broke due to hinge stress caused by moving pavement. I could not get anyone interested in repairing or replacing it except for a metal frabricator in Botany who quoted me $7000 for the job. The cost of materials at Bunnings was less than $500. I have never welded before but I through racing rally cars I have been around people who do lots of welding so I got the basic concepts. I bought a Bossweld 100 MIG welder for $250 and did a bit of practice. I had to buy a cheap small welding table and one of the challenges without a commercial welding table (which can cost several thousand for a big accurate one) is that it is difficult to set up your right angles for a panel that is about 1.8 m x 0.66 m of which there are 4 which must must all be flush once hung on the hinges. I got diagonals spot on but you get a banana effect from heat and I had to correct that in the final steps but cutting some cross bracing and then using a screw jack to bend the sides into place, clamp and re weld. The original gate weighed about 100kg and I reduced the weight to about 40 kg.
Here is a video of the gate in operation: https://www.thebeastofbondi.com/gate.mp4
Original gate
New gate
