In complex applications, such as those involving alloys other than mild steel, more information may be called for than can comfortably be indicated using the symbols alone. Annotations are used in these cases." [Symbols and conventions used in welding documentation. Wikipedia] The example chart "...
brazing and welding are different from each other. Soldering is done using solder while brazing is done using a lower melting-temperature filler metal. In welding, the base metal also melts while joining two metals whereas this is not the case with soldering and ...
-A4- 1.9 Signs and Symbols Symbol Meaning Warning for dangerous voltage! Contact with live electrical parts will result in severe injury or death. Warning for hot surface! Welding area is approximately 270oC(520℉) Allow sufficient time for the heater to cool down before any work in welding ...