Welding method and clamp of Venturi tube with bend

Abstract

The invention discloses a welding method and clamp of a Venturi tube with a bend. The welding method comprises the steps of: respectively clamping and positioning an inlet section and an outlet section of a Venturi tube with a transition section for welding; sequentially spot-welding all spots on a butt seam corresponding to arcs of 0 degree->180 degrees->270 degrees->450 degrees->495 degrees->675 degrees; carrying out sealing welding along the clockwise rotation from the starting point of the butt seam, and after welding the butt seam for one circle, starting arc extinguishing in a place exceeding the starting point by 15 degrees, so as to complete the sealing welding; and selecting a point, between which and the starting point the arc angle is 180 degrees, as another starting point to perform welding, and after welding for one circle, starting the arc extinguishing in a place exceeding the starting point by 15 degrees, so as to complete the welding. The clamp comprises a center shaft with a bend, wherein an inlet inner sleeve and an outlet inner sleeve are sleeved on the center shaft, the outer edge surfaces of the inner sleeves are clung to the inner wall of the Venturi tube, and protection sleeves are respectively arranged on two ends of the inner sleeves, and clamping flanges are respectively arranged on opening ends of an inlet section and an outlet section and are fixed through nuts. According to the welding method and the clamp disclosed by the invention, the Venturi tube with a wall thickness of 1-3mm and the bend of 3-8 degrees can be welded.

Description

technical field [0001] The invention relates to a welding method and fixture for a venturi tube with a bent angle, which belongs to the technical field of welding and is suitable for argon arc welding, vacuum electron beam welding and laser welding operations. Background technique [0002] The Venturi tube changes the flow rate of gas and liquid through the change of the pipe diameter. The pressure difference formed between the inlet section and the outlet section forms a certain vacuum after the outlet section, and then uses the principle of ejection and suction to complete the relevant special functions. Such as figure 1 shown. Because of its simple structure, small pressure loss, good repeatability, wide range of applicable working conditions, high precision, easy real-time monitoring and other advantages. At present, venturi tubes are mainly used in metallurgical industry, thermal power engineering, automobile, agricultural machinery, internal combustion engine and eng...

AI Technical Summary

Problems solved by technology

[0006] At present, domestic Venturi tube parts with curved angles are mainly manufactured by CNC machining methods. Due to the complexity of the parts, the technical difficulty is relatively large, the material utilization rate is low, the cost is high, and the scrap rate is high.

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