Using method of automatic welding limiting and protecting device for pipeline with threaded connector

Abstract

The invention provides a using method of an automatic welding limiting and protecting device for a pipeline with a screwed joint, which comprises the following steps of: 1, mounting an automatic welding clamp welding pliers clamping flap on an automatic welding pliers, placing a positioning pin in a sleeve, and fixing a sleeve and positioning pin assembly in the welding pliers clamping flap; secondly, a jacking block is inserted into the part connector and then inserted into a positioning pin, and meanwhile the guide pipe is clamped into symmetrical clamping flaps of the welding tongs; step 3, aligning a weld joint to be welded with a welding tongs tungsten electrode, and fastening the welding tongs; fourthly, a corresponding welding program is called, a start button is clicked, and welding is carried out; and fifthly, after the welding procedure is completed, the part is taken down. The method has the advantages that the pipeline welding qualification rate is remarkably increased, and the form and location tolerance precision of the pipeline is improved. The repair welding rate is reduced from 80% to 20%, the welding qualification rate is improved from 30% to 80%, and the pipeline assembly correction rate is reduced from 100% to 20%.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a method for using an automatic welding limit and protection device for a pipeline with a threaded joint. Background Art

[0002] The fuel, lubricating oil, hydraulic, ventilation, oxygen, anti-icing, electrical and other systems on the aircraft engine require pipelines, which play the role of oil and gas transportation and cable protection. Most of the pipelines on the engine are welded structures. Among them, argon arc welding is one of the most important welding methods. However, manual argon arc welding relies on the skill level and experience of workers, and the quality stability of the weld is poor. The welding process can only rely on the argon gas provided by the welding gun nozzle to provide protection for the front of the weld. At the same time, due to the limitation of operating space, it is difficult to add anti-deformation limit during pipeline welding, and the coaxiality and verticality of the pipeline joint after welding are difficult to ensure. With the advancement of science and technology, pipeline automatic welding technology has played an increasingly important role in the process of aviation engine pipeline welding. It does not rely on the skills of workers, can be closed for welding, and provides the possibility of limiting the welding process. However, in the engineering application of specific pipeline welding, there is still a phenomenon that the limit protection device is not matched and not applicable. The universal clamps that come with the automatic welding machine cannot clamp special pipe diameters and special-shaped connectors. This restricts the promotion and application of automatic welding.

[0003] The existing pipeline welding method is manual argon arc welding. During the welding process, the pipeline is in a free state, the weld joint is unrestricted, and the head is easily tilted. The weld protection relies on the argon gas in the welding gun nozzle, and the weld and heat-affected zone are severely oxidized. After adopting this patent, the pipeline welding is improved to automatic argon arc welding. The weld joint is in a restricted state during the welding process, which effectively ensures the coaxiality. At the same time, the welding process is carried out in a protective atmosphere filled with argon formed by the fixture, which effectively reduces the oxidation of the weld and the heat-affected zone. Summary of the invention

[0004] The purpose of the present invention is to change the target pipeline that can only be welded by manual argon arc welding to automatic welding, so as to improve the argon protection effect during welding, and at the same time limit the welding joint, improve the qualified rate of the weld, and reduce welding deformation. A method for using an automatic welding limit and protection device for a pipeline with a threaded joint is specially provided.

[0005] The present invention provides a method for using an automatic welding limit and protection device for a pipeline with a threaded joint, comprising the following steps:

[0006] Step 1: Install the automatic welding fixture welding clamp jaws on the automatic welding clamp, place the positioning pin in the sleeve, and fix the sleeve and positioning pin assembly in the welding clamp jaws;

[0007] Step 2: Insert the clamping block into the part joint, and then insert it into the positioning pin, and at the same time clamp the catheter into the symmetrical clamping petals of the welding clamp;

[0008] Step 3: Align the weld to be welded with the tungsten electrode of the welding clamp and tighten the welding clamp;

[0009] Step 4: Call the corresponding welding program, click the start button, and start welding

[0010] Step 5: After the welding process is completed, remove the parts.

[0011] Improve the coaxiality of pipeline parts welding joints, reduce the oxidation color of welds and heat-affected zones, and reduce dependence on welder skills and experience.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] The method for using the automatic welding limit and protection device for pipes with threaded joints of the present invention significantly improves the welding qualification rate of pipes using the limit protection device and automatic welding, and improves the shape and position tolerance accuracy of the pipes. It reduces the waste caused by factors such as insufficient manual welding protection, unstable heat input and lack of limit. The repair welding rate is reduced from 80% to 20%, the welding qualification rate is increased from 30% to 80%, and the pipe assembly correction rate is reduced from 100% to 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 It is the assembly drawing of the part limit protection device;

[0016] In the figure, 1 and 2 constitute parts, 1 is a joint, 2 is a catheter, 3 is a clamping flap, 4 is a positioning block, 5 is a supporting block, and 6 is a sleeve. DETAILED DESCRIPTION

[0017] The present invention will be further explained below in conjunction with specific implementation plans, but the present invention is not limited thereto. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0018] The present invention provides a method for using an automatic welding limit and protection device for a pipeline with a threaded joint, comprising the following steps:

[0019] Step 1: Install the automatic welding fixture welding clamp jaws on the automatic welding clamp, place the positioning pin in the sleeve, and fix the sleeve and positioning pin assembly in the welding clamp jaws;

[0020] Step 2: Insert the clamping block into the part joint, and then insert it into the positioning pin, and at the same time clamp the catheter into the symmetrical clamping petals of the welding clamp;

[0021] Step 3: Align the weld to be welded with the tungsten electrode of the welding clamp and tighten the welding clamp;

[0022] Step 4: Call the corresponding welding program, click the start button, and start welding

[0023] Step 5: After the welding process is completed, remove the parts.

[0024] Improve the coaxiality of pipeline parts welding joints, reduce the oxidation color of welds and heat-affected zones, and reduce dependence on welder skills and experience.

[0025] Matters not covered by the present invention are known technologies.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for using an automatic welding limit and protection device for a pipeline with a threaded joint, characterized in that: The steps include: Step 1: Install the automatic welding fixture welding clamp jaws on the automatic welding clamp, place the positioning pin in the sleeve, and fix the sleeve and positioning pin assembly in the welding clamp jaws; Step 2: Insert the clamping block into the part joint, and then insert it into the positioning pin, and at the same time clamp the catheter into the symmetrical clamping petals of the welding clamp; Step 3: Align the weld to be welded with the tungsten electrode of the welding clamp and tighten the welding clamp; Step 4: Call the corresponding welding program, click the start button, and start welding Step 5: After the welding process is completed, remove the parts. Improve the coaxiality of pipeline parts welding joints, reduce the oxidation color of welds and heat-affected zones, and reduce dependence on welder skills and experience.

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