I find it interesting you related this to welding. I have played around with thin metal welding where a single run of MIG welding would produce a relatively smooth bead when done, but the heat pattern on the reverse side would be minimal. On the other hand, I would stack spot welds to mimic the stacked dimes of TIG welding, once I released the trigger and let the puddle cool to an orange color then move over and zap the next coin I would actually show a continuous pattern of penetration on the reverse side. If I think I need better penetration on a piece, I will choose this higher concentration of heat energy in the On-Off-On pulse welding technique.
when you play around with fabrics you will develop a very good grasp of tensions and spreading loads and also shapes etc [the only thing different with steel is compression loads]
Sometimes when I help my wife make the bed in the morning , I simply give the blankets a simple "tug" and all the wrinkles disappear [my 2 seconds of contribution to household chores

]
The largest "tension structure" I was involved in was a 50,000 sq ft PVC "cable supported" Marquee.[all H/F welded]
I've also applied this knowledge to "monocoque" designs in race cars etc.
Anyway , when you look at a weld or a seam they are both stronger under shear loads [direction of these joins to the loads is important as the chart above states]
Here is an example on a utility trailer I built 10 years ago. Where the A-frame Tongue is welded to the main frame.
The tension loads are "pulling" at the coupler and "resisting" at the frame [red arrows] creating shear at the welds [blue lines]
Stopping with an un-braked trailer would create compression loads [arrows being opposite] but there is still shear at the welds.
here is an example of the welds.
Here is the tongue welds from the top . you can see the ends appearing like spot welds [circled]
I do not weld laterally across the front [or rear] of these welds.
There is bending loads applied down the tongue [constant elasticity] and a lateral weld creates a stress point and will fracture.
[on this trailer it got filled with hot-dipped zinc]
on a trailer that requires an "equalizer hitch" this problem is even worse, Any porpoising [up/down movement] will cause stress fractures.
So if you see this area not welded on a trailer, it is not cheap workmanship but somebody who knows about this.
When we weld "foot plates" for a roll-cage in FIA sanctioned vehicles , The cage tubing must be fully welded to the plate. But the foot plates are only permitted to be stitch welded to the unibody floor.
When a car is seam welded, it is stronger with stitch welds [fully welding creates a breakable/brittle stress point]
My race car has a claimed 2100 stitch welds in the main unibody [they are everywhere]
Ford did this when they were a "Body in white" for their racing programme.
sample here, but they're all over [including the trunk and cross-members under the floor.]
When playing around with the tig, try a method called "back stepping" to minimalise heat warpage.
I get more success from the Hammer welding technique [to counteract the welds "pinching" when they cool]