Saddle-shaped track automation welding method of collection box large tube socket

Abstract

The invention relates to a saddle-shaped track automation welding method of a collection box large tube socket. The saddle-shaped track automation welding method comprises a first step of acquiring tool parameters, a second step of setting weld pass section parameters and a fit-up gap G, a third step of edge preparation, wherein bevel angles of connecting tubes and female tube intersecting lines at different positions are determined according to a design principle of a uniform section bevel angle, connector portions of the connecting tubes are machined in a cutting mode, a fourth step of inputting the weld pass section parameters, the fit-up gap G, the tool parameters, the bevel angles and related technological parameters of planned adoptive welding technology into a numerical control welding system to calculate pose data of the tail end of a welding gun, and a fifth step of controlling the welding gun to continuously weld in a layer mode by the numerical control welding system according to the pose data. According to the saddle-shaped track automation welding method of the collection box large tube socket, the purpose of automatic, fast and continuous welding of the intersection line track under different pipe diameters is achieved, weld pass is arranged reasonably, connector quality is good, appearance is attractive, arrangement is ordered, and a technique is wide in application range.

Description

technical field [0001] The invention belongs to the technical field of header welding, and in particular relates to a saddle-shaped track automatic welding method for a large pipe seat of a header. Background technique [0002] A header (also known as a header) is a cylindrical pressure vessel used for collecting or distributing working fluids in a steam and water system, and usually includes a main pipe forming the main body of the header and a connecting pipe welded to the main pipe. The boiler pressure vessel is a common header. The boiler water flows from the drum through the downcomer into the lower box, and is distributed to each tube bundle by the tank. The water in these tube bundles continuously absorbs heat energy and collects into the upper box. Then flow back into the drum. [0003] In the welding of boiler and pressure vessel headers, it is often encountered that the main pipe (pipe seat)-the connecting pipe is vertically intersected and connected. At this time...

AI Technical Summary

Problems solved by technology

General factories still complete this type of welding by manual welding, which has a long manufacturing cycle, high labor intensity, low production efficiency and difficult to guarantee welding quality

In addition, conventional thick-walled saddle-shaped welding workpieces adopt equal-angle grooves, and adapt to changes in the filling amount of the grooves through changes in welding current or welding speed. More than 3:1, and the deposition ratio of each position along the intersecting line changes nonlinearly, coupled with the actual processing and assembly tolerances, the change of passing current cannot realize automatic continuous welding

[0004] The current robot welding technology can weld the weld joint in the teaching state, or can make continuous multi-turn welding actions through offline programming, but for dozens or even hundreds of weld beads formed by thick-walled pipes, the robot can’t do it at all. There is no way to know the specific welding position, so there is no robot equipment at home and abroad that can be applied to the continuous multi-layer multi-pass welding of the saddle mouth of thick-walled pipes

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