A Welder is a skilled tradesperson who specializes in joining materials together by using heat and pressure. Welders use various welding processes to fabricate and repair metal components of all sizes, from large structures such as bridges and ships to smaller items including handrails and household appliances. They work with a variety of metals including steel, aluminum, copper, brass, iron and stainless steel. In addition to welding materials together they may also cut them apart or shape them with special equipment. Safety is an important part of the job; welders must follow safety guidelines when working on projects that involve hazardous materials or high temperatures.