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Keywords:welder, steel, construction, welding, worker, work, high, safety, man, industrial, iron, job, dangerous, skilled, building, structure, industry, person, factory, workman, weld, constructor, protection, manufacturing, site, metal, rod, craft, light, mask, background, energy, beam, danger, heat, tools, craftsman, equipment, occupation, build, arch, electric, power station, biomass, boiler, cogeneration, plant, renewable, grating, silhouette, chimney, scaffold, cable
