Are all welds equally good?
Generally, the best stainless welds are produced using a “TIG” process. This means “Tungsten In Gas.” The process relies on precision fit of the parts. The best and strongest welds are “tiny,” with little or no filler rod required. Stainless needs to be welded at a relatively cold temperature, otherwise the chromium will be burnt from the metal. A “hot weld” will rust and ultimately fail due to absence of chrome and previously mentioned pitting corrosion. To prevent embrittlement and burning of the inside of the tube during the welding process, the tube should be purged with Argon gas. This prevents oxygen from coming into contact with the stainless until after it has cooled. To prevent “hot” welds and burnt metal, the process must be done quickly. Therefore, it takes many hours of practice to produce a competent welder.
