TIG-welded answers how the tubes of the frame are joined together - with a Tungsten Inert Gas arc welding machine.
Hi-tensile (or Hi-Ten) tells you the steel quality. Hi-Ten is pretty much the lowest grade tubing that anybody is willing to admit to using. Cro-Moly is a higher grade tubing, but there are several types.
Street/park tells you how the designer/marketer thinks the bike is to be used. It's not meant for racing or big airs.
Usually, the two bed-ends are either bolted to the frame (which is welded in a rectangular frame), or slot into dove-tail recesses.
Frame is part of the body on old Falcons and is held together by welded cross members. You have to repair it with patch panels.
The vin is generally stamped into the trailer tongue frame or stamped on a metal plate that is welded to the trailer tongue frame.
Gilbert D. Fish has written: 'Arc-welded steel frame structures'
It depends on the manufacturer. Most futons I have seen are steel, and can be cut with a torch, brazed, and welded.
To repair a broken door hinge on a 1991 Cherokee Briarwood, a new piece of metal should be welded in to hold the hinge. Then, a new hinge should also be welded in that is aligned with the door pin.
Steel wire mesh is welded by spot welding which could be continuous or staggered, depending on the application and strength of joints required. Sometimes, they are fastened by screws to the frame which serves as retainer also.
On a 1997 Yamaha Warrior with the original frame it is located on the frame bar underneath the motor, and a few inches in front of it. If it has a replacement frame, it may not have a vin, because on a replacement frame they are supposed to be cut out of the original frame and welded to the frame bar underneath the rear fender on the passenger side of the quad.
Those are structural, on a sub frame car, and have to be cut off, and welded back on.
On the left rear frame upright. A metal tag is welded on. Left side if sitting on the ATV.