Full-automatic welding method for interior and exterior of large-size connecting pipe on high-pressure dome
A fully automatic welding and high-pressure steam drum technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of difficult welding processing, dependence on welding quality, and high intensity of manual welding, and achieve stable and reliable quality.
Inactive Publication Date: 2017-01-04
HANGZHOU BOILER GRP CO LTD
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Problems solved by technology
At the same time, the thickness of the weld seam exceeds 150mm and the outer diameter of the connecting pipe reaches Φ700mm or more, which significantly increases the restraint and residual stress of the structure, which brings difficulties to the welding process
There are many connecting pipes on the high-pressure steam drum, which are basically welded by welders on site at present. However, the manual welding work is intensive and the environment is harsh, and the welding quality depends heavily on the level of the welder, so the quality of the weld is difficult to guarantee
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[0019] The present invention will be further described below with reference to the accompanying drawings.
[0020] This embodiment provides a fully automatic welding method for the inside and outside of a large-sized nozzle on a high-pressure steam drum, in which 100% MT flaw detection is all magnetic particle flaw detection, and 100% UT flaw detection is all ultrasonic flaw detection.
[0021] Include the following steps:
[0022] A. The drum shell to be welded and the nozzle processing groove, the groove 2 is a single-side V-shaped groove with a liner 1, such as figure 1 As shown, the groove angle α is 12°, the groove gap b is 20-24mm, the root gap c is 0-1mm, and the liner thickness d is 6mm;
[0023] Drum shell material is SA299GrB, specification is Φ2100х156
[0024] The connecting material is SA182F1 and the specification is Φ711.2
[0025] B. The submerged arc welding wire EF1 used for welding has a diameter of 4.0mm, and the submerged arc welding flux is F9A8-EF1-F1...
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Abstract
The invention discloses a full-automatic welding method for interior and exterior of a large-size connecting pipe on a high-pressure dome. A groove is processed in the to-be-welded dome shell and connecting pipe; the groove is a single-edge V-shaped groove with a lining plate; a saddle-shaped automatic welding machine is adopted for performing automatic submerged arc welding on the inner side and outer side of the dome shell; hydrogen removing treatment is performed after the welding is completed, and then 100% UT+100% MT flaw detection is performed; the stress relieving annealing is performed; after the annealing is completed, 100% UT+100% MT flaw detection is performed; the mechanical property detection is lastly performed. The full-automatic welding method has the advantage that the quality-stable, reliable and large-size welding joint between the high-pressure dome shell and the connecting pipe can be obtained.
Description
technical field [0001] The invention belongs to the technical field of pipeline welding, and in particular relates to a fully automatic welding method inside and outside a large-sized connecting pipe on a high-pressure steam drum. Background technique [0002] In recent years, with the gradual development of gas turbine waste heat boilers in the direction of high parameters and large capacity, SA299GrB has been more and more used in the high-pressure drum body materials of 9F and 9H gas turbines, and its minimum tensile strength has reached more than 550MPa, while the high-pressure The thickness of the steam drum reaches more than 150mm. At the same time, SA182F1 forgings are more and more used in the high-pressure steam drum centralized downcomer material of 9F and 9H gas turbines, and the outer diameter of the connecting pipe has also reached more than Φ700mm. [0003] In order to ensure the strength, toughness, fatigue resistance and other properties of the high-pressure ...
Claims
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IPC IPC(8): B23K9/18B23K9/235
CPCB23K9/18B23K9/235
Inventor 沈海峰钱丹许贝祝舜丰赵国坤宋边江廖丹扬李汝英
Owner HANGZHOU BOILER GRP CO LTD