First, welding has more than one hundred kinds of welding methods, there are manual welding, resistive touch welding, gas-fusion welding (carbon dioxide and argon, etc.), flame welding, ultrasonic welding and friction welding. More commonly used welding techniques are TIG welding, Carbon dioxide welding and manual welding. Welder need to go through formal training in welding, and acquire welding certificate before induction operation. Because of certain technical and skill requirements, different levels of welders have different different levels of quality welding products. Really high level welders (national level) has very high salary.
In operation, the welder need good professional means of protection, such as welding gloves, auto darkening welding helmet, welding shoes, underwear and aprons. So do not worry dangerous. Just follow the operating procedure is very safe.
Welder is one good technology, but to be a good welder required hard work and practice.