Stick welders are often used with thicker metals and for outdoor work. To protect the weld puddle from contaminants in the atmosphere, electrode rods are typically coated with a flux that creates a shielding gas when it burns. The author's vintage unit is slow but usable.
The wire and shielding gas feed through a relatively short (about 10 feet) hose, so the machine can't be placed too far away from the work.
The author braze welds a new brass thumb screw to the existing steel bolt of his damaged miter gauge.