KR102362192B1 - Method and server for study guidance using big data - Google Patents

Abstract

The present invention provides a learning guidance method, comprising the steps of: (a) receiving dictionary information input from a learner; (b) providing status information collected in the learner's practice process according to the dictionary information and the practice results after the practice is completed Receiving inspection information, (c) analyzing the learner's problems based on the status information, inspection information, and preset expert performance information, and (d) providing an improvement method according to the problems includes

Description

Learning instruction method and server using big data {METHOD AND SERVER FOR STUDY GUIDANCE USING BIG DATA}

This technology relates to learning guidance technology, and more particularly, to a learning guidance method and server using big data that helps learners to improve their own technical skills.

Since there is a difference in the degree of completion depending on various variables and the skill of the welder, repeated practice is essential to have welding ability that can be put into the field. Welding is taught at specialized high schools, Meister high schools, or vocational schools, but the differences in the skills of each learner receiving the training and the problems each learner has are diverse. Therefore, there is a problem that the educator cannot provide customized instruction for each learner.

As a technique for the conventional welding practice, there is a welding practice device with an improved structure so that the welding operation can be practiced by reproducing the field situation, but this is only to provide an environment that reproduces the field situation, and practice using the welding simulation device Although this method has advantages in terms of safety and learner control, there may be differences between practicing through a simulation device and practicing using an actual welding device. However, there is still a problem that the educator cannot provide customized instruction for each learner.

Korean Patent No. 10-1622298 Korean Patent Publication No. 10-2009-0111556

It is an object of the present invention to collect information such as the learner's posture and practice environment, and compare and analyze the collected information, the learner's practice results, and pre-entered expert data to identify the learner's problems and causes and provide solutions The present invention is to provide a learning guidance method and server.

A first aspect of the present invention for achieving the above object is a learning guidance method, comprising the steps of (a) receiving dictionary information input from a learner, (b) a state collected in the learner's practice process according to the dictionary information Receiving information and inspection information on the practice result after the practice is completed, (c) analyzing the learner's problem based on the status information, the inspection information, and preset expert performance information, and (d) ) and providing an improvement method according to the above problem.

Preferably, the step (a) comprises the step of receiving from the learner the learner's information, the date, and prior information including information on welding to be practiced, the information on the welding, the welding method , weld joint shape, base material, material, dimension, welding rod, or gas used.

Preferably, the step (a) further comprises the step of providing an expert's performance scene, welding posture, or precautions for the practice method as an image according to the prior information when receiving the prior information from the learner, Information on the expert's practice scene, welding posture, or precautions may be provided in text form when there is a confirmation request from the learner during the training process.

Preferably, the step (b) includes receiving a first image obtained from a plurality of general cameras installed in a space where the learner's practice is being performed, and a second obtained from an infrared camera worn by the learner It may include receiving an image.

Preferably, the step (c) comprises the steps of analyzing the learner's practice posture from the first image, and analyzing the learner's practice process from the second image, wherein the practice posture is a welding posture , a process method, or a process direction, and the practice process may include a minimum preheating temperature, interlayer temperature, preheat maintenance, post heat treatment, current type, polarity, electrode, or penetration technique.

Preferably, the step (b) includes receiving external inspection information and internal inspection information for the learner's practice result, wherein the external inspection information is visually analyzed from the learner or evaluator and added to the input information. Correspondingly, the internal inspection information may correspond to information on the presence or absence of defects, stress state, characteristic constitutional change, or soundness inspected using radiation, ultrasonic waves, electromagnetic waves, fluids, heat, or light.

Preferably, the step (c) compares the state information and the inspection information with the preset expert performance information to digitize the comparison result, and to analyze the comparison result to determine a problem in the learner's practice process may include steps.

Preferably, the step (d) may include providing analysis information on the problem, and optimal posture information, know-how, or skill method according to the problem.

Preferably, after step (d), if there is a previous record of the learner's practice, the method may further include the step of evaluating the degree of skill improvement of the learner by analyzing the previous record and the current practice record in an integrated manner. have.

A second aspect of the present invention for achieving the above object is a learning guidance server, a dictionary information receiving unit for receiving dictionary information input from a learner, status information collected in the learner's practice process according to the dictionary information, and the practice After this is completed, a practice information receiving unit that receives inspection information on the practice result, a problem analysis unit that analyzes the learner's problems based on the state information, inspection information, and preset expert performance information, and improvement according to the problems and an improvement method providing unit that provides a method.

As described above, according to the present invention, information such as the learner's posture and practice environment is collected, and the collected information, the learner's practice result, and the pre-entered expert data are compared and analyzed to identify the learner's problems and causes, and Because it suggests a solution to this, it has the effect of enabling learners to learn for themselves to improve their skills.

In addition, the present invention can be used in specialized high schools, Meister high schools, general (comprehensive) high schools, etc. to induce improvement in the skills of specialized skills in practical subjects, and can be used in other vocational schools, polytechnics, etc., and improve skills There is an effect that can be applied to various techniques to be induced.

1 is a block diagram of a learning guidance system according to a preferred embodiment of the present invention.
2 is a block diagram of a learning map server according to an embodiment.
3 is a flowchart of a learning guidance method according to an embodiment.

Hereinafter, the advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. “and/or” includes each and every combination of one or more of the recited items.

It should be understood that although first, second, etc. are used to describe various elements, components, and/or sections, these elements, components, and/or sections are not limited by these terms. These terms are only used to distinguish one element, component, or sections from another. Accordingly, it goes without saying that the first element, the first element, or the first section mentioned below may be the second element, the second element, or the second section within the spirit of the present invention.

In addition, identification symbols (eg, a, b, c, etc.) in each step are used for convenience of description, and identification symbols do not describe the order of each step, and each step is clearly specified in context. Unless the order is specified, the order may differ from the specified order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” refers to the presence of one or more other components, steps, operations, and/or elements mentioned. or addition is not excluded.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

In addition, in the description of the embodiments of the present invention, if it is determined that a detailed description of a well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

1 is a block diagram of a learning guidance system according to a preferred embodiment of the present invention.

Referring to FIG. 1 , a learning guidance system 100 includes a user terminal 110 , a camera 120 , and a learning guidance server 130 . Here, the user terminal 110 , the camera 120 , and the learning map server 130 are connected through a network.

The user terminal 110 is a device that a learner who performs welding practice can have or operate. Preferably, the user terminal 110 can install and execute an application or program for performing the learning guidance method provided by the learning guidance server 130, and includes a user interface to control input and output of data. can For example, the user terminal 110 is any type of wired/wireless communication device capable of performing an operation necessary to perform a learning guidance method by accessing the learning guidance server 130 through a network, and is a variety of applications (Applications) desired by the user. ) is based on an open operating system that can be downloaded, used, and deleted freely, and is installed on a computing device such as a PC, smartphone, PDA (Personal Digital Assistant), or tablet PC equipped with a central processing unit, memory device, and input/output means. may be applicable.

The camera 120 is an image photographing device for photographing a learner's posture and practice process, and a plurality of cameras 120 may be provided, and different types of cameras may be included. Preferably, the camera 120 may include two general cameras installed in a space where welding practice is performed, and one infrared camera worn by a learner, and the type and number of cameras can be variously modified.

The learning guidance server 130 is a device connected to the user terminal 110 and the camera 120 to perform the learning guidance method. Preferably, the learning guidance server 130 collects various data obtained from the user terminal 110 and the camera 120 in the practice process to form big data, and analyzes the learner's practice process based on this to provide the best advice to the learner. It can provide improvement measures for appropriate technical skill improvement. That is, the data received from the user terminal 110 and the camera 120 are used as basic data for continuous analysis of various learners, and such data is stored in the learning map server 130 internal storage device or a separate database. It can be stored and managed through

2 is a block diagram of a learning guidance server according to an embodiment, and FIG. 3 is a flowchart of a learning guidance method according to an embodiment.

Referring to FIG. 2 , the learning guidance server 130 includes a dictionary information receiving unit 131 , a practice information receiving unit 132 , a problem analysis unit 133 , an improvement method providing unit 134 , and a control unit 135 . . Here, the control unit 135 controls the operation and data flow of the dictionary information receiving unit 131 , the practice information receiving unit 132 , the problem analyzing unit 133 , and the improvement method providing unit 134 .

Operations performed through each configuration of the learning guidance server 130 will be described in more detail below with reference to FIG. 3 . Here, for convenience of explanation, the subject performing each operation in the learning map server 130 is separately described, but the subject performing the corresponding operation is easily integrated by a person skilled in the art of the present invention, detachable or transformable.

Referring to FIG. 3 , the dictionary information receiving unit 131 receives dictionary information input from the learner (step S310 ). Preferably, the learner can input the prior information into the user terminal 110, and the dictionary information receiving unit 131 includes the learner's information from the user terminal 110, the date, and information about welding to be practiced. The prior information can be received, and the prior information can be used to form big data related to the improvement of the learner's technical skill. Here, the welding information may include all information related to welding practice with the welding method, the shape of the weld joint, the base material, the material, the dimensions, the welding rod, or the gas used, and the practice history for each learner based on the learner's information information can be managed.

That is, the learner designates and inputs values for all essential variables of the welding procedure through the user terminal 110 . Alternatively, when the specified values to be input as the prior information coincide with the setting values, essential variables, and additional variables of the machine (equipment to be practiced), the prior information receiving unit 131 receives the corresponding setting values and variables from the machine. It can be provided and set as advance information.

For example, the learner may input the following dictionary information through the user terminal 110 .

WELDING PROCESS

- SMAW (SHIELDED METAL ARC WELDING): Covered arc welding (SM)

- SAW (SUBMERGED ARC WELDING):

- GTAW (GAS TUNGSTEN ARC WELDING): Non-consumable electrode arc welding (GT)

- TIG (TUNGSTEN INERT GAS ARC WELDING)

- GMAW (GAS METAL ASRC WELDING): Consumable electrode arc welding (GM)

- MIG: METAL INERT GAS ARC welding

- MAG: METAL ACTIVITY GAS ARC welding (CO2 welding)

- FCAW: FLUX CORED ARC WELDING (FC)

WELDING JOINT (Welded joint shape)

- JOINT DESIGN: joint type

- GROOVE: groove welding

- FILLET: cross joint

- BACKING: underlay

BASE MATERIAL : Classified according to the chemical composition of the material, mechanical strength, etc.

- P1: mild steel

- P3: Material with 0.5% or less of Mo and Cr added to mild steel

- P4: material with 1-2% Cr and 0.5% Mo added to mild steel

- P5: material with 2-5% Cr and 0.5% or more Mo added to mild steel

- P6: MAARTENSITE series stainless steel (13% Cr, usu410) P7 Used for materials requiring strength and hardness

- P7: FERRITE-based stainless steel (SUS405, 430)

- P8: AUSTENITE series stainless steel (18Cr-8Ni)

- P9: steel with Ni added to mild steel

- P10: high Cr stainless steel (22Cr + additive elements)

- P31: copper and copper alloy

- P32: NAVAL BRASS, AL-BRASS (Cu + Zn)

- P34: CUPRONIKEL (Cu + Ni)

- P35: BRONZE (Bronze)

- P42: MONEL (Ni + Cu)

- P43: INCONEL (Ni + Cr + Fe alloy)

- P51: Titanium

FILLER MATERIAL (welding material) : Classified according to the use of the welding material, the welding method, and the material

- F NO4: SMAW welding rod for mild steel

- F NO5: SMAW welding rod for stainless steel

- F NO6: Welding rod and welding wire for GTAW

- SFA NO.: Specification of welding materials classified by ASME

- A NO.: Classified according to the specifications of welding materials classified by AWS (only given to steel materials), weldability and chemical composition, and the same number has almost the same weldability

- ALLOY: Refers to materials in which the amount of special elements added to the material is greater than the content of the five major elements of steel (5 major elements: carbon, silicon, manganese, phosphorus, sulfur)

- LOW ALLOY (low alloy steel): Materials with an amount of 5% or less of added elements excluding the five major elements of steel

- HIGH ALLOY (high-alloy steel): Materials with more than 5% of added elements

In one embodiment, upon receiving the dictionary information input to the user terminal 110 from the learner through the dictionary information receiving unit 131, the practice method providing unit (not shown in the drawing) is an expert on the practice method according to the prior information A performance scene, welding posture, or precautions may be provided as an image to be output through the user terminal 110 . In other words, detailed information on how the learner's welding work should be done according to the welding method selected by the learner is provided, so that the learner's learning efficiency is improved through the re-acquisition of relevant knowledge before practice. In addition, information on the expert's practice scene, welding posture, or precautions may be provided in the form of text or video when there is a request from a learner during the training process and output to the user terminal 110 . For example, the practice method providing unit may provide caution information as shown in [Table 1] to [Table 3] to the user terminal 110 .

arc welding safety

type of disaster cause Measures electric shock (electric shock) · Nozzle in the holder's energized part
・Body contact of the welding rod end
· Poor insulation of welding machine
・Work in wet or humid places
・When the body of the welder is wet with sweat or when the clothes are wet · Equipped with automatic electric shock prevention device for welding machine
Use of insulation holder
· Insulated clothing for welders (avoid exposure to the body)
・Switch opening and closing in a specified way
Switch off when work is stopped Disaster caused by arc light ・Eye arc exposure
Wearing safety glasses with poor light blocking power ・Wearing appropriate safety glasses
Use of light-shielding screens and light-shielding partitions Fires, burns and explosions caused by spatter ・Spatter scattering
・Volatile and explosive substances ・Location close to welding site
·Combustible material's proximity to the welding site ・Arrangement of welding workshop
· Removal of flammable substances
· Removal of combustible materials gas poisoning ・Zinc oxide gas・Carbon monoxide
・Fluorine gas, carbon tetrachloride
・Welding fume ・Wear a gas mask
· Adequate ventilation in the workplace choke ・Leakage of gas in a narrow space Adequate ventilation
·guardian

Safety in gas welding and cutting

type of disaster cause Measures Disaster caused by gas flames ・Ultraviolet and infrared rays of gas flame white core ・Wear light-shielding glasses fire, burn, explosion Dispersion of cutting spatter
·backfire ・Removal of combustible substances
・Arrangement of fire extinguishers
Appropriate work attire
·Use of flashback arrester
·Removal of foreign substances at the tip of the tip
・Handling precautions for the container light valve gas poisoning ・Carbon monoxide
・Zinc oxide gas
Gas leakage from torch or hose Wear a gas mask if necessary
· Adequate ventilation
・Prevention of gas leakage

Safety of working conditions

working conditions Measures work at height Wearing a hard hat and seat belt Installation of fences and protective nets in the workplace
·Installation of fixed work tools
・Installation of dedicated stairs, traps, etc.
・Cleaning and removal of combustion materials under the workplace Harmful and combustible gases ・Installation of dedicated ventilation system ・Sufficient ventilation

The practice information receiving unit 132 receives the state information collected in the learner's practice process according to the prior information and the inspection information on the practice result after the practice is completed (step S320). After inputting the prior information, the practitioner inspects the cross-sectional shape of the material to be welded, the straightness of the welding member, and the cleaning condition, performs welding in the best condition, and practices welding so that defects do not occur as much as possible, and the practice information receiving unit ( 132) receives the status information collected during this practice process. That is, the practice information receiving unit 132 collects information such as environmental factors (eg, welding posture, current, voltage, etc.) that can affect the result when performing the practice as status information to provide more accurate improvement to the learner. As a way to present a plan, it is checked during practice whether defects occur due to materials and equipment by checking the penetration state, welding width, surface shape, etc. during practice.

Preferably, the practice information receiving unit 132 receives, as state information, a first image obtained from a plurality of general cameras installed in a space where a learner's practice is being performed, and a second image obtained from an infrared camera worn by the learner. can receive Here, two or more general cameras are installed at the top or the middle of the practice space to photograph the learner's overall practice posture, and the infrared camera is fixed to the practitioner's head or the hat worn by the practitioner and the learner's point of view It is possible to photograph in detail the overall practice process carried out by the

Preferably, the practice information receiving unit 132 may receive external inspection information and internal inspection information for the learner's practice result, which is structurally check whether there is a defect inside or outside the welding result under a welding condition result information to be. The external inspection information corresponds to the information input by visually analyzing the welding part from the learner or the evaluator within the range that does not damage the welding part. Since 70 to 80% of welding defects can be analyzed through external inspection, an inspector (a learner or an evaluator) performing an external inspection requires proficiency, and the inspector is provided to the user terminal 110 and outputted to the existing skilled person (eg, For example, an external inspection can be performed by comparing and analyzing the data performed by an expert such as a master craftsman) with the results of the practice. Internal inspection information is to inspect the inside and outside of the practice product (eg, welding surface) without changing or destroying the nature and internal organization of the practice product. It may correspond to information on the presence or absence of defects inspected using light, stress state, characteristic constitutional change, or health.

The problem analysis unit 133 analyzes the learner's problem based on the status information, the inspection information, and preset expert performance information (step S330).

Preferably, the problem analysis unit 133 may analyze the status information received through the practice information receiving unit 132 . More specifically, the problem analysis unit 133 may analyze the learner's practice posture from the first image received through the practice information receiving unit 132 . Here, the practice posture includes a welding posture, a proceeding method, or a proceeding direction, and for example, each of the welding posture, proceeding method, or proceeding direction may be analyzed in detail as follows.

welding posture

- FLAT: view below

- Home store: 1G - 6G

- FILLET: 1F - 4F

How to proceed

- VERTICAL UP: vertically upward method

- VERTICAL DOWN: vertical downward method

Welding posture is divided into Groove Position and Fillet Position, and it is divided into Plate and Pipe according to the welding material.

* Position(s) of Groove (QW-120) / Plate material (QW-120)

- 1G: Weld the base material horizontally and view from top to bottom

- 2G: Weld the base material vertically and horizontally

- 3G: Weld the base material vertically and vertically

- 4G: Weld the base material horizontally and view from below

* Position(s) of Groove (QW-120) / Pipe material (QW-122)

- 1G: Weld from top to bottom while rotating the base material horizontally

- 2G: Weld the base material vertically and horizontally

- 5G: Weld by fixing the base material horizontally and rotating around the base material

- 6G: Weld the base material at an angle of 45 degrees from the horizontal and rotate it around the base material.

* Position(s) of Fillet (QW-130) / Plate material (QW-130)

- 1F: (Flat Position) Weld the two base metals to be welded at an angle of 45˚ from the horizontal plane and weld from top to bottom

- 2F: (Horizontal Position) Weld in the horizontal direction by placing the base material to be welded on the vertical and horizontal planes and tilting the welding rod 45 degrees

- 3F: (Vertical Position) Weld two base materials in the vertical direction

- 4F: (Overhead Position) Place two base metals on a vertical line and a horizontal line, respectively, and tilt the welding rod 45 degrees to perform horizontal top-view welding

* Position(s) of Fillet (QW-130) / Pipe material (QW-132)

- 1F: (Flat Position) Make the axis of the pipe at 45˚ to the horizontal line, rotate it, and weld the bottom view in the vertical direction.

- 2F & 2FR: (Horizontal Position)

- 2F: Bottom view welding while rotating around the base metal by fixing the pipe axis vertically and tilting the welding rod 45 degrees

- 2FR: Bottom view welding by turning the pipe axis horizontally and tilting the welding rod 45 degrees

- 4F: (Overhead Position) Weld from above by fixing the pipe axis vertically and tilting the welding rod 45 degrees

- 5F: (Multiple Position) Welding in various postures while fixing the pipe axis horizontally and rotating around the base material

Welding Progression

- UP - Welding work from bottom to top

- DOWN - welding proceeds from top to bottom

Also, the problem analysis unit 133 may analyze the learner's practice process from the second image received through the practice information receiver 132 . Here, the practice process may include minimum preheating temperature, interlayer temperature, preheating maintenance, post heat treatment, current type, polarity, electrode, or penetration technique, for example, detailed information for each will be analyzed as follows. can Here, information on the minimum preheating temperature, interlayer temperature, preheating maintenance, post heat treatment, current type, polarity, electrode, or penetration technique is explained as being analyzed from the image acquired from the infrared camera, which is the second image, but in the practice process If the machine operation information generated is collected from the operating machine itself or from a separate device connected to the operating machine (eg, current meter, temperature meter, etc.) In this case, the process of analyzing the second image may be omitted.

1. Heat treatment

- Minimum preheating temperature: Conducted at 100MM left and right of the welding part

- Inter-floor temperature: Prevention of excessive heat input

- Post-Heat Treatment: Usually 200-300 degree temperature is carried out for about 1 hour to remove diffusible hydrogen and increase the impact value

1.1 Minimum preheating temperature : To reduce the harmful effects of high-temperature welding heat on the base metal and weld metal, set the minimum temperature by heating the weld joint according to the type of base material before welding (purpose of preheating: low-temperature crack prevention, mechanical properties) improvement, prevention of hard tissue formation, reduction of deformation and residual stress, prevention of blow hole formation)

* Preheat

- P-No.1, Gr No.1,2,3

A) Base material with maximum carbon content exceeding 0.30% and thickness exceeding 1˝ (25mm): 175°F (79°C)

B) All other base materials of the above P-No.: 50℉ (10℃)

- P-No.3, Gr No.1,2,3

A) Base material with minimum tensile strength exceeding 70000 psi (483-Mpa, 49.22Kg/cm2) or thickness exceeding 5/8 inch (16mm): 175°F (79°C)

B) All other base materials of the above P-No. : 50℉(10℃)

- P-No.4, Gr No.1

A) Base material 250°F (121°C) with a minimum tensile strength of 60000psi (414Mpa, 42.18Kg/cm2) or a thickness exceeding 1/2 inch (13mm)

B) All other materials of the above P-No. : 50℉(10℃)

C) P-No.5A AND 5B, Gr No.1

1) Base material with a minimum tensile strength exceeding 60000psi (414Mpa, 42.18Kg/cm2) or a minimum chromium content of 6.0% or more and a thickness exceeding 1/2 inch (13mm): 400°F (204°C)

2) All other materials of the above P-No.: 300℉(149℃)

D) P-No.6, Gr No.1,2,3: 400℉(204℃)

E) P-No.7, Gr No.1,2: Not required

F) P-No.8, Gr No.1,2: Not required

G) P-No.9

1) P-No.9A, Gr No.1: 250℉(121℃)

2) P-No.9B, Gr No. : 300℉(149℃)

H) P-No.10

1) P-No10A Gr No.1: 175℉(79℃)

2) P-No.10B Gr No.2: 250℉(121℃)

3) P-No.10C Gr No.3:175℉(79℃)

4) P-No.10F Gr No.6: 250℉(121℃)

Base metal of P-10D, Gr 4 and P-10E Gr.5 is preheated to 300°F (149°C), preheated to 300°F (149°C) and maintained interpass temperature between 300°F (232°C).

I) P-No.11

1) P-11A

Gr. 1: Not required (see Note)

Gr. 2: Same as P-No.5

Gr. 3: Same as P-No.5

Gr. 4: 250°F (121°C)

2) P-11B

Gr. 1: Same as P-No.3 (refer to Note)

Gr. 2: Same as P-No.3 (refer to Note)

Gr. 3: Same as P-No.3 (refer to Note)

Gr. 4: Same as P-No.3 (refer to Note)

Gr. 5: Same as P-No.3 (refer to Note)

Gr. 6: Same as P-No.3 (refer to Note)

Gr. 7: Same as P-No.3 (refer to Note)

Note: In order to avoid adversely affecting the mechanical properties of the annealed material, the limit of the Interpass Temperature should be given according to the thickness.

1.2 Interpass Temperature : The temperature of the base material that is raised by heat input during welding. If the maximum value is to be regulated so as not to change the metal structure or mechanical properties of the base material, the maximum allowable temperature

1.3 Preheat Maintenance : If post-heat treatment is required after welding, heating means to keep the temperature above the preheating temperature from being damaged by rapid cooling (e.g. , electrical resistance wire, gas burner, etc.)

2. Postweld Heat Treatment (QW-407) : Post-welding heat treatment is performed to remove residual stress after welding, softening, and preventing cracks. Post-weld heat treatment conditions for carbon steel, low alloy steel, and high alloy steel are ASME Sec. VII. UCS-56 & Table of DIV.1 According to UCS-56, UHA-32 & Table, it is as follows [Table 4] (PWHT purpose: prevention of cracks, improvement of impact properties, improvement of corrosion resistance (SCC), deformation and residual stress decrease)

texture General heat treatment maintenance temperature ℉ (℃), Min Minimum holding time at normal heat treatment temperature for nominal thickness 1 ≤2" 2" < t ≤ 5" T > 5” P-No. One
Gr. No. 1,2,3 1,100 (593) 1 hr/in;
(minimum 15 minutes) 2hrs + 15mins
(for every 1" increment of 2" or more) 2hrs + 15mins
(for every 1" increment of 2" or more) P-No. 3
Gr. No. 1,2,3 1,100 (593) 1 hr/in;
(minimum 15 minutes) 2hrs + 15mins
(for every 1" increment of 2" or more) 2hrs + 15mins
(for every 1" increment of 2" or more) P-No. 4Gr. No. 1,2,3 1,100 (593) 1 hr/in;
(minimum 15 minutes) 1hr/in 5hrs + 15mins
(for every 1" increment over 5") P-No. 5 1,250(676)* 1,300(P-No. 5B. Gr. 2) 1 hr/in;
(minimum 15 minutes) 1hr/in 5hrs + 15mins
(for every 1" increment over 5") P-No. 6Gr. No. 1,2,3 1,250 (676) 1 hr/in;
(minimum 15 minutes) 2hrs + 15mins
(for every 1" increment of 2" or more) 2hrs + 15mins
(for every 1" increment of 2" or more) P-No. 7
Gr. No. 1,2 1,350 (732) 1 hr/in;
(minimum 15 minutes) same as above same as above P-No. 8Gr. No. 1,2,3 -- -- -- -- P-No. 9A 1,100 (593) 1 hr/in;
(minimum 15 minutes) 1hr/in 5hrs + 15mins
(for every 1" increment over 5") P-No. 9B
Gr. No. One 1,100 (593) same as above same as above same as above P-No. 9BGr. No. One 1,100 (593) same as above same as above same as above P-No. 9BGr. No. One 1,100 (593) same as above same as above same as above P-No. 9BGr. No. One 1,100 (593) same as above same as above same as above P-No. 9BGr. No. One 1,250 (676) same as above same as above 1hr/in P-No. 9B
Gr. No. One 1,100 (593) same as above same as above 5hrs + 15mins
(for every 1" increment over 5") P-No. 9B
Gr. No. One -- -- -- -- P-No. 9BGr. No. One -- -- -- -- P-No. 9B
Gr. No. One 1,350 (732) 1 hr/in;
(minimum 15 minutes) 1hr/in 1hr/in

3. Welding Current Characteristics

* Current type: direct current (DC) and alternating current (AC)

* Polarity

- Positive polarity (SP): The state in which the pole is connected to the welding electrode (thin penetration)

- Reverse polarity (RP): The state in which the + pole is connected to the welding electrode (deep penetration)

- Electrode: Tungsten Electrode

EWTH-2: 2% Thorium, for CD

EW: pure tungsten, for AC

3.1 Current (AC or DC) & Polarity : The type of current used during welding and the type of polarity in case of direct current

- Current: AC or DC

- Polatity

- Straight Polarity (SP): When welding with DC current, the base material is the + pole and the welding rod or non-consumable electrode is the − pole. The penetration is deep and the bead width is narrow.

- Reverse Polarity (RP): When using DC current welding, the base material is - pole, the welding rod or non-consumable electrode is used as the + pole. The penetration is shallow and the bead width is high.

3.2 Amps(Range) & Volts(Range) : Measure the range of appropriate current and voltage values when welding with WPS. Measurement of current range and voltage range according to the size of each welding rod, welding material, and the type and thickness of the base material. Since current and voltage are not continuously maintained as machine input values during welding, the best results can be obtained by continuously adjusting them in the middle of the practice. To this end, information on how the learner adjusts the change value of current and voltage during the practice is collected.

- Heat Input: When an impact test is required, keep less than the maximum heat input of PQR for each process

3.3 Tungsten Electrode Size & Type : When the welding process is GTAW, the size and type of tungsten rod used as an electrode

3.4 Electrode Wire Feed Speed Range : In case of automatic or semi-automatic welding process, measuring the feed speed of welding wire

- Unit, m/min, in/min (Example, 200- 450 in/min)

4. Penetration technique

- How to move: STRING, WEAVE

- Gouging method: arc air gouging, grinding

- Distance between base metal and contact tube: distance between tip and base metal

- Number of welding layers: multi-layer, single-layer

4.1 String or Weave Bead : Checking the shape of the bead determined by the welding rod

- String: Without weaving, the shape of the bead is straight and smooth in one direction

- Weave: A wavy welding bead is formed by welding while moving the welding rod laterally in the welding direction (eg, SMAW manual welding bead, GTAW manual welding bead)

4.2 Oscillation : When the welding width is wide, it is a method of moving the welding machine by applying vibrations in a zigzag manner to penetrate a wide range with one pass during welding. Measure the delay time (D.TIME) by stopping at the end

4.3 Contact Tube to Work Distance : In SAW, FCAW, GMAW, etc., measure the distance between the contact tube that gives the electrode to the electrode and the base material to be welded. Welding performance and ARC properties depend on this distance. Usually around 15-20mm

4.4 Travel Speed (Range) : Measuring the transfer speed of the welding rod during welding or the transfer speed of the base material when fixing the welding rod (unit, Cm / min, m / min, in / min)

Preferably, the problem analysis unit 133 compares the inspection information obtained from the state information and the practice information receiving unit 132 analyzed from the first image and the second image with preset expert performance information to digitize the comparison result, , it is possible to determine problems in the learner's practice process by analyzing the numerical comparison results. More specifically, the problem analysis unit 133 compares each item of state information (eg, welding posture, welding direction, heat treatment, welding current, etc.) and each value of inspection information to each item value and final value of the expert performance information. After comparing the result with the optimal value of the inspection information, the comparison value is digitized, and when the comparison value exceeds a preset threshold, the corresponding item can be determined as a learner's problem.

Alternatively, the problem analysis unit 133 compares the inspection information with a preset optimal value of the inspection information, analyzes the cause of the result of the inspection information, extracts an item that is highly likely to correspond to a problem from the state information, and selects the item from the state information. The value of the extracted problem item (for example, welding progress direction, minimum preheating temperature, current type, etc.) is compared with the value of the corresponding item in the preset expert performance information to obtain a comparison result and digitize it can do.

Here, the optimum values for the expert performance information and the inspection information may be preset and stored according to each welding method corresponding to the prior information, and managed through the learning guidance management server 130 or a separate database.

The improvement method providing unit 134 may provide an improvement method according to the problem (step S340) and analyze the skill level. Preferably, the improvement method providing unit 134 may provide analysis information on the problem, and optimal posture information, know-how, or skill method according to the problem. For example, the improvement method providing unit 134 provides information about the learner's welding posture problem and heat treatment problem at a specific stage of welding, and as a method for improving the problem, an image of a preferred welding posture, welding specificity An image of the process of performing the heat treatment in the step, an explanation related thereto, etc. may be provided so that the learner can check it through the user terminal 110 . Also, the improvement method providing unit 134 may analyze the learner's skill proficiency based on the learner's analysis information analyzed through the problem analysis unit 133 , which may be quantified and evaluated in the form of a score.

In one embodiment, the learning guidance server 130 may further include an integrated record analysis unit, and when there is a previous record of the learner's practice, the integrated record analysis unit analyzes the previous record and the current practice record in an integrated manner to determine the learner's ability The degree of improvement can be evaluated. That is, if there is a learner's previous record, the history of the problem analysis result, the inspection information history of the practice result practiced by the learner, or the technical proficiency history can be analyzed, and the inspection information or the technical proficiency level is in the same form as the score. If converted to a numerical value of , the score change history may be provided in the form of a graph, and such information is provided to the user terminal 110 so that the learner can check it.

Meanwhile, the learning guidance method according to an embodiment of the present invention may also be implemented as computer-readable codes on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data readable by a computer system is stored.

For example, computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy disk, removable storage device, and non-volatile memory (Flash Memory). , and optical data storage devices.

In addition, the computer-readable recording medium may be distributed in computer systems connected through a computer communication network, and stored and executed as readable codes in a distributed manner.

Although preferred embodiments of the learning guidance method and server according to the present invention have been described above, the present invention is not limited thereto, and various modifications are made within the scope of the claims, the detailed description of the invention, and the accompanying drawings. possible and also belong to the present invention.

100: learning guidance system
110: user terminal
120: camera
130: learning map server
131: advance information receiving unit
132: practice information receiving unit
133: problem analysis unit
134: improvement method providing unit

Claims (10)

In the learning guidance method performed in the learning map server,
(a) the dictionary information receiving unit receiving the dictionary information input from the learner;
(b) receiving, by the practice information receiving unit, state information collected in the practice process of the learner according to the prior information and inspection information on the practice result after the training is completed;
(c) the problem analysis unit analyzing the problem of the learner based on the state information, the inspection information, and preset expert performance information; and
(d) the improvement method providing unit includes the step of providing an improvement method according to the above problems,
The step (b) may include: receiving, by the practice information receiving unit, a first image obtained from a plurality of general cameras installed at the top or middle of the space where the learner's practice is being performed; and receiving a second image obtained from an infrared camera fixed to the learner's head or a hat worn by the learner,
The step (c) may include: analyzing, by the problem analysis unit, a practice posture of the learner corresponding to a welding posture, a proceeding method, and a proceeding direction from the first image; and analyzing the learner's practice process corresponding to the minimum preheating temperature, interlayer temperature, preheating maintenance, post heat treatment, current form, polarity, electrode, and penetration technique from the second image. Way.
According to claim 1, wherein the step (a),
The prior information receiving unit includes the step of receiving the learner's information, the date, and the prior information including information on welding to be practiced from the learner, the information on the welding, the welding method, the shape of the weld joint; A learning instruction method, characterized in that it corresponds to the base material, material, dimension, welding rod, or gas used.
According to claim 2, wherein the step (a),
When the prior information receiving unit receives the prior information from the learner, the practice method providing unit further comprises the step of providing an expert's performance scene, welding posture, or precautions for the practice method as an image according to the prior information, The learning guidance method, characterized in that the information on the expert's practice scene, welding posture, or precautions is provided in text form when there is a confirmation request from the learner during the practice process.
delete delete According to claim 1, wherein the step (b),
The practice information receiving unit includes the step of receiving external inspection information and internal inspection information for the learner's practice result,
The external inspection information corresponds to information that has been visually analyzed and input from the learner or evaluator, and the internal inspection information includes the presence or absence of defects inspected using radiation, ultrasound, electromagnetic, fluid, heat, or light, the state of stress, A learning guidance method, characterized in that it corresponds to information about characteristic constitutional changes or health.
According to claim 1, wherein the step (c),
The problem analysis unit compares the state information and the inspection information with the preset expert performance information to digitize the comparison result, and analyzes the comparison result to determine a problem in the learner's practice process. learning guidance method.
According to claim 1, wherein the step (d),
The improvement method providing unit is a learning guidance method comprising the step of providing analysis information on the problem, and optimal posture information, know-how, or a mastery method according to the problem.
The method of claim 1, wherein after step (d),
The integrated record analysis unit, if there is a previous record of the learner's practice, integrally analyzes the previous record and the current practice record to evaluate the degree of skill improvement of the learner.
a dictionary information receiving unit for receiving dictionary information input from a learner;
a practice information receiver configured to receive state information collected in the learner's practice course according to the prior information and inspection information on a practice result after the practice is completed;
a problem analysis unit for analyzing the learner's problems based on the state information, the inspection information, and preset expert performance information; and
Including an improvement method providing unit that provides an improvement method according to the above problems,
The practice information receiving unit receives a first image obtained from a plurality of general cameras installed at the top or middle of the space in which the learner's practice is being performed, and is fixed to the learner's head or the hat worn by the learner Receive the second image obtained from the infrared camera,
The problem analysis unit analyzes the learner's practice posture corresponding to the welding posture, the proceeding method, and the proceeding direction from the first image, and from the second image, the minimum preheating temperature, interlayer temperature, preheat maintenance, post heat treatment, current A learning guidance server, characterized in that it analyzes the learner's practice process corresponding to the shape, polarity, electrode, and penetration technique.

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