A professional who lays out and fabricates metal structural parts, such as plates, bulkheads, and frames, and braces them in position within hull of ship for riveting or welding. Responsibilities include:

• Lays out position of parts on metal, working from blueprints or templates and using scribe and handtools.
• Locates and marks reference lines, such as center, buttock, and frame lines.
• Positions parts in hull of ship, assisted by rigger.
• Aligns parts in relation to each other, using jacks, turnbuckles, clips, wedges, and mauls.
• Marks location of holes to be drilled and installs temporary fasteners to hold part in place for welding or riveting.
• Installs packing, gaskets, liners, and structural accessories and members, such as doors, hatches, brackets, and clips.
• May prepare molds and templates for fabrication of nonstandard parts.
• May tack weld clips and brackets in place prior to permanent welding.
• May roll, bend, flange, cut, and shape plates, beams, and other heavy metal parts, using shop machinery, such as plate rolls, presses, bending brakes, and joggle machines.