Double-gun symmetrical back-gouging-free welding method for marine engine base part

Abstract

The invention discloses a double-gun symmetrical back-gouging-free welding method for engine base parts of a marine engine. The double-gun symmetrical back-gouging-free welding method comprises the following steps that firstly, the engine base parts are assembled; secondly, rivet welding fixing is conducted; thirdly, backing welding is conducted; 4, filling and cover surface welding are carried out; and after bottoming welding is completed, the engine base part is hoisted to a welding station, and corresponding filling and cosmetic welding are carried out at the flat welding position. The back-gouging-free welding method is reasonable in overall design and easy and convenient to operate, back-gouging-free welding can be achieved for welding of the bearing seat and the transverse web part, the welding process is simplified, the welding efficiency is improved, the production period is shortened, meanwhile, the machine seat part is not prone to deformation in the welding process, the welding quality is guaranteed, and the production cost is reduced. And great convenience is brought to the welding work of the engine base part.

Description

Technical Field

[0001] The invention relates to the technical field of welding of marine engine base components, and in particular to a double-gun symmetrical root cleaning-free welding method for marine engine base components. Background Art

[0002] Marine engines are the heart of ships. Marine engines are often low-speed two-stroke engines that can burn heavy oil. Such engines are mostly piston diesel engines, especially two-stroke diesel engines, which work similarly to motorcycle engines, that is, the crankshaft rotates twice to complete one work. The cylinder diameter of a marine engine can be close to one meter, and the power can reach tens of thousands of horsepower. Some large marine engines can even reach 100,000 horsepower and weigh thousands of tons.

[0003] The stability of a marine engine during operation is crucial to whether the ship can travel safely. The marine engine is installed on the ship through the engine base, which means that the engine base is the load-bearing structure of the entire marine engine. The engine base is manufactured by welding, so the welding quality requirements are relatively high.

[0004] At present, the base components are mainly manufactured by welding. There are two main welding methods. One is to weld in the flat welding position first, then turn over and perform root cleaning operation, and finally weld the other side by flat welding. This welding method requires a tedious root cleaning process. Not only is the overall welding process more complicated, but it also occupies a large welding area, and its output per unit area is small.

[0005] The other method is to first weld in the flat position and then use the deep penetration welding technology. After the front base welding, the bearing seat component is turned over and the other side is welded. Although this welding method eliminates the tedious root cleaning process, the overall welding efficiency of the base component is low during the welding process, and the base component is very easy to deform during the welding process, which seriously reduces the welding quality of the base component and brings great inconvenience to the welding work of the base component. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a double-gun symmetrical root-cleaning-free welding method for a marine engine base component. The welding method has a reasonable overall design and is simple to operate. It can achieve root-cleaning-free welding of a bearing seat and a transverse web component, thereby simplifying the welding process, improving the welding efficiency, and shortening the production cycle. At the same time, the base component is not easily deformed during the welding process, thereby ensuring the welding quality and bringing great convenience to the welding work of the base component.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A double-gun symmetrical root cleaning-free welding method for a marine engine base component, characterized in that it comprises the following steps:

[0009] Step 1: Assemble the base components

[0010] Assemble the bearing seat and the transverse web plates welded on both sides of the bearing seat on the welding platform;

[0011] Step 2: Riveting and fixing

[0012] Carry out corresponding riveting and welding operations on the assembled bearing seat and the transverse web;

[0013] Step 3: Base welding

[0014] Fix the automatic welding carriage on the transverse web, adjust the position and angle of welding gun A and welding gun B, and after the adjustment, use the double-gun symmetrical and upward vertical welding method to perform the base welding;

[0015] Step 4: Filling and cover welding

[0016] After the base welding is completed, the machine base components are hoisted to the welding station and the corresponding filling and cover welding are carried out in the flat welding position.

[0017] In a preferred embodiment of the present invention, before the bearing seat and the transverse web are assembled in step one, it is necessary to machine the grooves on both sides of the transverse web, the angle of the groove is 50-60°, the root is 0-2mm, and the gap between the assemblies is 0-2mm.

[0018] In a preferred embodiment of the present invention, the welding method in step three is metal-metal gas shielded welding, and the welding wire is ER70S-6, the wire diameter of which is 1.2 mm, the current of both guns is 160-200A, the voltage is 24-28V, and the moving speed is 300-500mm / min.

[0019] In a preferred embodiment of the present invention, during the base welding in step three, the weld is protected by a mixed gas, and the mixed gas is a mixture of Ar and CO2.

[0020] In a preferred embodiment of the present invention, in the mixed gas, the Ar gas content is 80%, and the CO2 gas content is 20% by volume.

[0021] In a preferred embodiment of the present invention, during the step three vertical welding, the angle between the welding gun and the weld is 70-80°, welding gun A and welding gun B use the same welding parameters, and the front and rear distance between welding gun A and welding gun B is 3-5mm.

[0022] In a preferred embodiment of the present invention, during the filling and capping welding in step 4, when one side of the groove is filled to 2 / 3, the groove is turned over and welding is performed on the other side, and the two sides are welded alternately.

[0023] Compared with the prior art, the present invention has a reasonable overall design, simple operation, and convenient operation. It can realize root-free welding between the bearing seat and the transverse web component, simplifies the welding process, not only improves the welding efficiency, but also shortens the production cycle. At the same time, it is not easy for the machine base component to be deformed during the welding process, thereby ensuring the welding quality and bringing great convenience to the welding work of the machine base component. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the weld between the bearing seat and the transverse web of the present invention.

[0027] Figure 3 for Figure 2 AA section view. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0029] Reference Figure 1-Figure 3 As shown in the figure, a double-gun symmetrical root cleaning-free welding method for a marine engine base component is provided, comprising the following steps:

[0030] Step 1: Assemble the base components

[0031] Assemble the bearing seat 100 and the transverse web plates 200 welded on both sides thereof on a welding platform;

[0032] Before the bearing seat 100 and the transverse web 200 are assembled, it is necessary to machine the grooves on both sides of the transverse web. The groove form between the bearing seat 100 and the transverse web 200 is a double-sided single V-shaped groove, the groove angle B is 50-60°, the root is 0-2mm, and the assembly gap is 0-2mm.

[0033] Step 2: Riveting and fixing

[0034] Perform corresponding riveting and welding operations on the assembled bearing seat 100 and the transverse web plate 200;

[0035] Step 3: Base welding

[0036] Fix the automatic welding carriage on the transverse web 200, adjust the positions and angles of welding guns A400 and B500, and after the adjustment, use a double-gun symmetrical and upward vertical welding method to perform base welding;

[0037] The base welding method is metal-metal gas shielded welding. The welding wire is ER70S-6 with a wire diameter of 1.2mm. The current of both guns is 160-200A, the voltage is 24-28V, and the moving speed is 300-500mm / min.

[0038] During the base welding, the weld 300 is protected by a mixed gas, the mixed gas is a mixture of Ar and CO2, in which the Ar gas content is 80% and the CO2 gas content is 20% by volume.

[0039] When performing vertical welding for base welding, the angle C between welding gun A, welding gun B and the weld is 70-80°. Welding gun A400 and welding gun B500 use the same welding parameters, and the front and rear distance between welding gun A400 and welding gun B500 is 3-5mm.

[0040] Step 4: Filling and cover welding

[0041] After the base welding is completed, the machine base components are hoisted to the welding station and the corresponding filling and cover welding are carried out in the flat welding position.

[0042] When performing filling and capping welding, when one side of the groove is filled to 2 / 3, turn over and weld the other side, alternating between the two sides. This method can effectively control the deformation during the welding process.

[0043] In summary, the overall design of the present invention is reasonable, the operation is simple, and the operation is convenient. It can realize root-free welding between the bearing seat and the transverse web component, simplifying the welding process, not only improving the welding efficiency, but also shortening the production cycle. At the same time, the base component is not easily deformed during the welding process, thereby ensuring the welding quality and bringing great convenience to the welding work of the base component.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A double-gun symmetrical root cleaning-free welding method for a marine engine base component, characterized in that: The following steps are involved: Step 1: Assemble the base components Assemble the bearing seat and the transverse web plates welded on both sides of the bearing seat on the welding platform; Step 2: Riveting and fixing Carry out corresponding riveting and welding operations on the assembled bearing seat and the transverse web; Step 3: Base welding Fix the automatic welding carriage on the transverse web, adjust the position and angle of welding gun A and welding gun B, and after the adjustment, use the double-gun symmetrical and upward vertical welding method to perform the base welding; Step 4: Filling and cover welding After the base welding is completed, the machine base components are hoisted to the welding station and the corresponding filling and cover welding are carried out in the flat welding position.

2. A method for double-gun symmetrical root cleaning-free welding of a marine engine base component as claimed in claim 1, characterized in that: In step 1, before the bearing seat and the transverse web are assembled, both sides of the transverse web need to be grooved by machining. The angle of the groove is 50-60°, the root is 0-2mm, and the gap between the assemblies is 0-2mm.

3. A method for double-gun symmetrical root cleaning-free welding of a marine engine base component as claimed in claim 1, characterized in that: The welding method in step three is metal-metal gas shielded welding. The welding wire is ER70S-6 with a wire diameter of 1.2 mm. The current of both guns is 160-200 A, the voltage is 24-28 V, and the moving speed is 300-500 mm / min.

4. A method for double-gun symmetrical root cleaning-free welding of a marine engine base component as claimed in claim 1, characterized in that: In step 3, the weld is protected by a mixed gas during base welding, and the mixed gas is a mixture of Ar and CO2.

5. A double-gun symmetrical root-cleaning-free welding method for a marine engine base component as claimed in claim 4, characterized in that: In the mixed gas, the Ar gas content is 80% and the CO2 gas content is 20% by volume.

6. A method for double-gun symmetrical root cleaning-free welding of a marine engine base component as claimed in claim 1, characterized in that: During step three of vertical welding, the angle between the welding gun and the weld is 70-80°, welding gun A and welding gun B use the same welding parameters, and the front and rear distance between welding gun A and welding gun B is 3-5mm.

7. A method for double-gun symmetrical root cleaning-free welding of a marine engine base component as claimed in claim 1, characterized in that: In step 4, when performing filling and cover welding, when one side of the groove is filled to 2 / 3, turn over and weld the other side, alternating between the two sides.

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