Non-back-gouging welding method for T-shaped full penetration fillet weld of crane girder thick plate

Abstract

The invention relates to the thick plate welding method, in particular to a non-back-gouging welding method for a T-shaped full penetration fillet weld of a crane girder thick plate. The non-back-gouging welding method includes: a enlarging a T-shaped weld groove of a crane girder to be 60 degrees and changing the angle formed by a ship-shaped support and the ground to be 34 degrees; and b placing a flame-retarding asbestos rope on one side of the T-shaped weld of the crane girder to serve as a liner, using a full-length flat bar to tightly press the asbestos rope and using a magnet to fix the full-length flat bar. The non-back-gouging welding method has the advantages of removing back gouging normally carried out for the T-shaped weld of the crane girder, saving time and improving efficiency; not using carbon arc air gouging bars and grinding sheets, simultaneously saving electric energy and cost; and reducing a large amount of noise pollution and providing a large improving space for ambient environment and physical and psychological health of constructors.

Description

technical field [0001] The invention relates to a thick plate welding method, in particular to a T-shaped full-penetration fillet weld of a crane girder thick plate without root-clearing welding method. Background technique [0002] During the production process of the crane girder, the T-shaped weld between the upper flange and the web is a full penetration weld, and the quality of the weld is grade two, requiring 20% ​​UT flaw detection inspection. The traditional welding method currently used is to open the bevel on the web first, weld the weld seam on one side first, and then clean the weld seam on the other side (usually completed by carbon arc gouging and angle grinder), and then This side submerged arc welding is then performed. The disadvantages of this method are: ① waste of time and low efficiency. The crane girder needs to be root-cleaned during root cleaning. After root cleaning, parts that do not conform to the specification need to be polished with an angle g...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: ① waste of time and low efficiency

The crane girder needs to be root-cleaned when root-cleaning. After root-cleaning, parts that do not meet the specifications need to be polished with an angle grinder, which wastes time and is inefficient

②Waste of materials

During the cleaning process, the carbon rods will make harsh noises, and the grinder will also make high-decibel noises. For those who work in such an environment for a long time, it is very harmful to their health.

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