A professional who performs any combination of following duties to assist metal fabricator in fabricating and assembling boilers and steel plate vessels, such as tanks and vats. Respnsibilities include:

• Tends machines, such as drill press, punch press, and boring mill to drill, punch, and ream metal stock for boiler parts.
• Tends power shears to cut plate to size and shape.
• Grinds welded joints, seams, and other irregular areas to smooth boiler surfaces, using portable and pedestal grinders.
• Wraps blanket of spun glass around shell to insulate boiler and tacks blanket to shell surface, using stud welding gun.
• Operates sandblasting machine to clean tank surfaces prior to painting or coating.
• Moves and positions materials at work site with help of other workers, using overhead bridge crane or dolly.
• Removes casing, grates, and grate rigging from boiler prior to repair of boiler and reassembles them after repair, using handtools.
• Performs other duties described under helper master title.