Small-section square girder and welding process thereof

• Main Authors: ZUO YONG, HAI WEIDONG
• Format: Patent
• Language: Chinese; English
• Published: 14.11.2012
• Subjects: BLASTING; CLADDING OR PLATING BY SOLDERING OR WELDING; CONSTRUCTIONAL ELEMENTS IN GENERAL; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WELDING; WORKING BY LASER BEAM

The invention discloses a small-section square girder and welding process thereof, belonging to welding technology and capable of solving the problem of low welding quality in case of small manual welding space. The small-section square girder has four girder plates with widths of 200-220mm and lengths smaller than or equal to 10m in paired arrangement to form a box-shaped inner cavity, in which are arranged reinforcement rib plates, flanges are welded at two ends of the girder plates, and inside and outside fillets are present between the girder plates and between the girder plates and the flanges. In welding, a to-be-welded part is cleaned before welding, a run-on plate and a run-off plate are assembled and welded, welding is carried out by use of an automatic welding cart, an inner cavity and an exposed welding seam alternate welding sequence is adopted during welding, an inner cavity backing welding seam is firstly formed, the backing welding seam for an exposed welding seam is then formed after the back