Ключевые слова: arc, background, bond, burns, chain, close, confident, connect, connection, construction, craft, craftsman, cut, detail, electro, firmness, fresh, grid, industry, insurance, iron, joint, line, material, metal, new, online, pattern, pipe, pipeline, positions, scale, seam, security, sheets, solder, splice, steel, surface, technology, texture, together, tube, up, weld, welded, welder, welding, work,