a skilled welder in protective gear holds a welding torch that produces bright sparks and flames. The intense heat from the torch melts the edges of two separate metal plates positioned on the workbench. The molten metal flows and fuses together, creating a strong bond between the previously separate pieces. As the metal cools, it forms a solid joint where the two pieces are now permanently connected. An apprentice watches carefully from nearby, learning the technique while other workers continue their tasks in the background. metal pieces being joined together by heating and melting their edges