Spring-Attachments

Below is what an engineer told me when I asked which trampolines would be the most grounded and stable with heavier loads and warp less. This is their repsonse:

As for your question on mig welding, there are loads of different methods of welding. For tramps, arc welding is the suitable method, and of the various types of arc welding, mig is the best for tramps. (other types include stick welding and tig). Mig welding allows for good penetration, and creates a weld that is typically stronger than the metal actually joined. However, any form of welding can do that given the right circumstances. The reason I prefer mig is that it has a larger heat affected zone. Though this is sometimes seen as a negative, it all depends on the application, and for tramps, it is actually ideal. The HAV becomes larger when the metal cools more slowly. However, when metal cools more slowly, internal stresses are relieved and the metal becomes more flexible. Processes that cool more quickly (tig) have a smaller HAV and the metal surrounding the weld is harder.

Generally, harder equals stronger equals better.

This is a pic of a corrugated rod. It's the zigzag bar that some companies weld onto a standard tube frame.

Not that thier are no screws or holes drilled in the frame but this zig zag bar that the springs go into. Its much more expnesive to get this type than the ones where the holes are drilled in. This type of design lets me also put more springs on a trampoline so I can customize the tension.