CN111992860B

CN111992860B - Flux-cored wire deposited metal test method

Info

Publication number: CN111992860B
Application number: CN202010868606.2A
Authority: CN
Inventors: 吴磊磊; 江泽新; 曹璐; 齐超
Original assignee: Guangzhou Shipyard International Co Ltd
Current assignee: Guangzhou Shipyard International Co Ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2022-08-02
Anticipated expiration: 2040-08-26
Also published as: CN111992860A

Abstract

The invention provides a method for testing deposited metal of a flux-cored wire, which comprises the following steps: s1, providing a first test plate and a second test plate, respectively forming a first groove and a second groove on a single surface at the butt joint position of the first test plate and the second test plate, so that a welding area is formed between the first test plate and the second test plate, a groove included angle of 25-35 degrees is formed between the first groove and the second groove, a minimum groove gap is formed between the first test plate and the second test plate, the minimum groove gap is 10-20mm, and a gasket for connecting the first test plate and the second test plate is arranged on one side of the minimum groove gap; and S2, fixing the welding gun on the oscillator, inclining the welding gun forwards by 5-15 degrees, enabling the welding dry elongation to be 10-30 mm, driving the welding gun to move back and forth between the first test plate and the second test plate by the oscillator during automatic welding, and carrying out multilayer welding on a welding area. The method for testing the deposited metal of the flux-cored wire provided by the invention adopts an automatic welding method to test, so that the test difficulty is reduced, and the test result deviation is small.

Description

Flux-cored wire deposited metal test method

Technical Field

The invention belongs to the technical field of welding, and particularly relates to a method for testing deposited metal of a flux-cored wire.

Background

Flux-cored wire carbon dioxide gas shielded welding is currently widely applied in domestic shipyards. Due to the characteristics and the characteristics of the manufacturing process, the performance can fluctuate, and generally, the performance of welding materials in each batch needs to be detected, namely, a deposited metal welding test. The method adopted at present is to carry out manual operation for personnel to hold the welding handle.

The deposited metal test adopted at present needs skilled workers to operate. The main operation processes, such as parameter adjustment, dry elongation control and swing, need manual judgment and autonomous processing, and have certain deviation in detail judgment according to different people. In severe cases, the two workers adopt the same process and technology under the same condition, but certain deviation exists in the test result. Meanwhile, due to factors such as physical strength and emotion, the consistency of front and back welding of a single test plate and the consistency of simultaneous welding of a plurality of test plates cannot be guaranteed. This will directly affect the performance of the weld, leading to the failure of the deposited metal test of the welding material to reflect the real situation.

In addition, due to the operation deviation of personnel, the welding time of the whole test plate is about 2 hours, and the inter-lane temperature needs to be detected repeatedly and frequently, so that the stability of the inter-lane temperature is controlled, labor and time are wasted, and errors are easy to occur.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a method for testing deposited metal of a flux-cored wire with better test stability.

The invention provides a method for testing deposited metal of a flux-cored wire, which comprises the following steps:

s1, providing a first test plate and a second test plate, respectively forming a first groove and a second groove on a single surface at the butt joint position of the first test plate and the second test plate, so that a welding area is formed between the first test plate and the second test plate, a groove included angle of 25-35 degrees is formed between the first groove and the second groove, a minimum groove gap is formed between the first test plate and the second test plate, the minimum groove gap is 10-20mm, and a gasket for connecting the first test plate and the second test plate is arranged on one side of the minimum groove gap;

and S2, fixing a welding gun on a oscillator, enabling the welding gun to incline forwards by 5-15 degrees, enabling the welding dry elongation to be 10-30 mm, and driving the welding gun to move back and forth between the first test plate and the second test plate by the oscillator during automatic welding to perform multilayer welding on the welding area.

Preferably, each layer of the multilayer welding comprises a left welding path and a right welding path, and after each welding path is finished, when a welding seam formed by the finished welding path is cooled to 150 +/-15 ℃, the next welding path is welded.

Preferably, each layer of the multilayer welding comprises a left welding bead and a right welding bead, the welding starting positions of the left welding bead and the right welding bead are the end parts of the first test plate or the second test plate, the welding starting positions of the left welding bead and the right welding bead are different, and the left welding bead and the right welding bead intersect in the middle of the groove.

Preferably, a first included angle of 80-85 degrees is formed between the slope surface of the first test board and the bottom surface, and a second included angle of 80-85 degrees is formed between the slope surface of the second test board and the bottom surface.

Preferably, the welding parameters during welding are as follows: the welding current is 250A-350A, the welding voltage is 25-35V, the welding speed is 15-40cm/min, and the heat input is 10-30 KJ/cm.

Preferably, during the welding, the swing width of the welding gun is 1/6-5/6 of the width of the groove gap.

Preferably, the multilayer weld is 4-10 layers.

Preferably, the thickness of the first test plate and the second test plate is 15-25 mm.

Preferably, the oscillating frequency of the oscillator is 35-45 cycles/min.

Preferably, the length of the first test board and the length of the second test board are both 300mm-500mm, the width of the first test board and the width of the second test board are both 100mm-150mm, and the thickness of the first test board and the thickness of the second test board are both 15mm-25 mm; the length of the pad is 300mm-500mm, the width is 30mm-70mm, and the thickness is 5mm-15 mm.

The method for testing the deposited metal of the flux-cored wire provided by the invention adopts an automatic welding method to test, so that the test difficulty is reduced, and the test result deviation is small.

Drawings

The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the principles of the invention.

FIG. 1 is a schematic diagram of a groove structure according to an embodiment of the present invention;

FIG. 2 is a schematic view of a 5-layer 10-pass weld bead arrangement provided in example 1 of the present invention;

fig. 3 is a schematic view of a bead layout for welding 7 layers of 14 passes in example 1 of the present invention.

In the figure:

100. a first test panel; 200. a second test panel; 300. a liner; a. included angle of the groove; b. minimum groove gap; 400. a welding area; 401. a first bevel; 402. a second bevel; 11. a left weld bead; 12. a right weld bead; 13. welding seams; c. a first included angle; d. a second included angle; t, thickness; 1. a first weld pass; 2. a second bead set; 3. a third weld pass; 4. a fourth weld pass; 5. a fifth weld pass; 6. a sixth weld pass; 7. a seventh weld pass; 8. an eighth weld pass; 9. a ninth weld pass; 10. the tenth pass.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, an embodiment of the present invention provides a method for testing deposited metal by a flux-cored wire, including the following steps:

s1, providing a first test plate 100 and a second test plate 200, respectively forming a first groove 401 and a second groove 402 on a single surface at the butt joint position of the first test plate 100 and the second test plate 200, so that a welding area 400 is formed between the first test plate 100 and the second test plate 200, and a groove included angle a of 25-35 degrees is formed between the first groove 401 and the second groove 402. In this embodiment, the included angle a is the sum of the angle of the first bevel 401 and the angle of the second bevel 402.

The minimum groove gap b is formed between the first test plate 100 and the second test plate 200, the distance of the minimum groove gap b is 10-20mm, and a gasket 300 for connecting the first test plate 100 and the second test plate 200 is arranged on one side of the minimum groove gap b. In this embodiment, before assembly, the surface of the pad 300, the surface of the first groove 401, the surface of the second groove 402, and the 20mm surrounding area need to be cleaned of oil, rust, water, and other impurities, and polished to be bright by an abrasive machine.

The method ensures that a voltmeter and an ammeter of the welding machine are qualified after being detected by a metering department, and in the valid period, whether a power supply fan rotates or not needs to be noticed when the welding machine is started, so that abnormal sound and smell do not exist, if the welding machine is found to be abnormal, the welding machine needs to be stopped in time and reported for repair as soon as possible, and the welding machine can be used after being repaired normally. And presetting the specification after the welding machine is confirmed to normally operate.

S2: and the welding gun is fixed on the oscillator, the welding gun inclines forwards by 5-15 degrees, the welding dry elongation is 10-30 mm, and during automatic welding, the oscillator drives the welding gun to move back and forth in the welding area 400 between the first test plate 100 and the second test plate 200 to carry out multilayer welding on the welding area 400.

The embodiment of the invention adopts an automatic welding mode, so that the problems that manual operation of a welding wire deposited metal test is not consistent in manual method of different personnel and deviation is easy to generate are solved; the condition that the operation of personnel is unstable is avoided, and the performance of the welding wire is reflected to the maximum extent; the operation difficulty of personnel is reduced, the automatic equipment welding does not need to hold a certificate of a welder of a classification society, and the qualification of the operators can be relaxed; improve the operating environment and construction conditions of personnel.

The flux-cored wire deposited metal test method provided by the embodiment of the invention can be applied to welding procedures of China shipbuilding industry or other industries. The construction difficulty is reduced, the construction condition of workers is improved, the working efficiency is improved, the test result can be truly embodied, and the deviation of human factors is avoided.

The flux-cored wire is a main welding material for ship construction, is an important control point of the welding seam quality of a ship body, and is used for detecting the quality of the welding seam to influence the welding seam performance and finally influence the ship safety. The method for testing the deposited metal of the flux-cored wire provided by the embodiment of the invention adopts an automatic welding method for testing, the testing difficulty is reduced, the welding seam performance is detected, the numerical value is stable, the deviation value is small, and the actual performance of the deposited metal can be reflected.

The method for testing the deposited metal of the flux-cored wire provided by the invention reflects the result of the deposited test of the welding material to the greatest extent, standardizes the purchase and test of the welding material of a company, is easier to operate, has higher accuracy, and avoids disputes generated when the test result of a product is unqualified.

In a preferred embodiment, the included angle a of the bevel is 26 °, 27 °, 28 °, 29 °, 32 °, 33 °, 34 ° or 35 °.

In a preferred embodiment, the distance of the minimum groove gap b is 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm or 19 mm.

In a preferred embodiment the welding gun is tilted forward 8 ° -12 °, and the weld dry elongation is 15mm-25mm, in a further preferred embodiment 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm or 24 mm.

Referring to fig. 2 and 3, in the preferred embodiment, the multi-layer weld is 4-10 layers, each layer including a left weld bead 11 and a right weld bead 12. The welding start positions of the left weld bead 11 and the right weld bead 12 are the end parts of the first test board 100 or the second test board 200, the welding start positions of the left weld bead 11 and the right weld bead 12 are different, and the left weld bead 11 and the right weld bead 12 are intersected in the middle of the groove 400. The welding direction of each pass is changed at the end of the first test panel 100 or the second test panel 200, and is staggered. As shown in fig. 2, for 5-layer 10-pass welding, the first pass 1 and the second pass 2 constitute a first welding layer; the third weld bead 3 and the fourth weld bead 4 constitute a second weld layer; the fifth weld bead 5 and the sixth weld bead 6 constitute a third weld layer; the seventh bead 7 and the eighth bead 8 constitute a fourth weld layer; the ninth bead 9 and the tenth bead 10 constitute a fifth weld layer.

In a preferred embodiment, the welding parameters during welding are: the welding current is 250A-350A, the welding voltage is 25-35V, the welding speed is 15-40cm/min, and the heat input is 10-30 KJ/cm. Specific parameters for the 5-layer weld and the 10-layer weld in this example are shown in table 1.

TABLE 1

Number of welding layers	Current (A)	Voltage (V)	Welding speed (cm/min)	Heat input (KJ/cm)
					5	280	31.5	23	23.0
7	280	31.5	34	15.6

Referring to fig. 3, in the preferred embodiment, after each welding pass, the weld formed by the completed welding pass is cooled to 150 ± 15 ℃ before the next welding pass. The temperature measurement mode of the weld joint 13 in this embodiment is as follows: measured on a steel plate 20mm to 30mm from the edge of the groove 400, preferably 25mm from the edge of the groove 400.

In the embodiment, the welding heat input is fixed, the time interval of the temperature drop after welding can be determined, and the need of monitoring the welding temperature in real time is avoided. The temperature reduction period of each welding line is consistent, the temperature control is more accurate, and the operators can conveniently and reasonably arrange the work.

Referring to fig. 1, in a preferred embodiment, a first included angle c of 80-85 ° is formed between the slope surface and the bottom surface of the first test board 100, and a second included angle d of 80-85 ° is formed between the slope surface and the bottom surface of the second test board 200. In a further preferred embodiment, the first angle c and the second angle d are equal. When the included angle a of the groove is 25 to 35 degrees, and the first included angle c and the second included angle d are 80 to 85 degrees, both ends of the first test board 100 and the second test board 200 are inclined downward with respect to the upper surface of the gasket 300. In the embodiment, by setting the reversible deformation, a better welding effect can be realized during welding. In a further preferred embodiment the included angle a of the bevel is 30 deg., and the included angles c and d of the first and second angle d are 80 deg..

In the preferred embodiment, the swing width of the welding gun is 1/6-5/6 of the gap width of the groove 400 during welding.

In a preferred embodiment, the oscillator has an oscillation frequency of 35-45 cycles/min. The wobble frequency is selected in dependence on the wobble amplitude, the larger the wobble amplitude the higher the wobble frequency.

Referring to FIG. 1, in a preferred embodiment, the first test panel 100 and the second test panel 200 have a thickness t in the range of 15mm to 25mm, preferably 20 mm.

Referring to FIG. 1, in a preferred embodiment, the first test panel 100 and the second test panel 200 each have a length of 300mm to 500mm, a width of 100mm to 150mm, and a thickness t of 15mm to 25 mm; the length of the pad 300 is 300mm-500mm, the width is 30mm-70mm, and the thickness is 5mm-15 mm. Through the reasonable size that sets up test panel and liner 300 in this embodiment, avoid leading to the test deviation great because the test panel is inclined to the great difference, the embodiment that can be better deposits metal actual performance. In a further preferred embodiment, the length × width × thickness of the first test panel 100 and the second test panel 200 is 400 × 125 × 20 mm; the length × width × thickness of the gasket 300 is 400 × 50 × 10 mm.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, reference to the description of the terms "preferred embodiment," "yet another embodiment," "other embodiments," or "specific examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.

Claims

1. The method for testing the deposited metal of the flux-cored wire is characterized by comprising the following steps of:

s1, providing a first test plate (100) and a second test plate (200), respectively arranging a first bevel (401) and a second bevel (402) on a single surface at the butt joint position of the first test plate (100) and the second test plate (200), enabling a welding area (400) to be arranged between the first test plate (100) and the second test plate (200), forming a bevel included angle (a) of 25-35 degrees between the first bevel (401) and the second bevel (402), arranging a minimum bevel gap (b) between the first test plate (100) and the second test plate (200), enabling the distance of the minimum bevel gap (b) to be 13-20mm, and arranging a gasket (300) connecting the first test plate (100) and the second test plate (200) at one side of the minimum bevel gap (b);

s2, fixing a welding gun on a oscillator, enabling the welding gun to incline forwards by 5-15 degrees, enabling the welding dry elongation to be 10-30 mm, and driving the welding gun to move back and forth between the first test plate (100) and the second test plate (200) by the oscillator during automatic welding to carry out multilayer welding on the welding area (400);

each layer of the multilayer welding comprises a left welding bead (11) and a right welding bead (12), and after each welding bead is welded, when a welding seam formed by the welded welding bead is cooled to 150 +/-15 ℃, the next welding bead is welded;

the welding starting positions of the left welding bead (11) and the right welding bead (12) are the end parts of the first test plate or the second test plate, the welding starting positions of the left welding bead (11) and the right welding bead (12) are different, and the left welding bead and the right welding bead are intersected in the middle of the groove;

the welding parameters during welding are as follows: the welding current is 250A-350A, the welding voltage is 25-35V, the welding speed is 15-40cm/min, and the heat input is 10-30 KJ/cm; the heat input quantity is fixed during the welding,

a first included angle (c) of 80-85 degrees is formed between the slope surface and the bottom surface of the first test board (100), a second included angle (d) of 80-85 degrees is formed between the slope surface and the bottom surface of the second test board (200),

both ends of the first test board (100) and the second test board (200) are inclined downward with respect to the upper surface of the pad (300).

2. The method for testing the deposited metal of the flux-cored wire according to claim 1, wherein the swing width of the welding torch is 1/6-5/6 of the width of the groove gap during the welding.

3. The flux cored wire deposited metal test method of claim 1, wherein the multi-layer weld is 4-10 layers.

4. The flux cored wire deposited metal test method of claim 1, wherein the first test panel (100) and the second test panel (200) have a thickness of 15-25 mm.

5. The method of claim 1 wherein the oscillator oscillates at a frequency of 35 to 45 cycles per minute.

6. The method for testing the deposited metal of the flux-cored wire according to claim 1, wherein the first test plate (100) and the second test plate (200) each have a length of 300mm to 500mm, a width of 100mm to 150mm, and a thickness of 15mm to 25 mm; the length of the pad (300) is 300mm-500mm, the width is 30mm-70mm, and the thickness is 5mm-15 mm.