CN111761162A - Flame cutting process for reducing depth of cutting heat affected zone of H-shaped steel web - Google Patents
Flame cutting process for reducing depth of cutting heat affected zone of H-shaped steel web Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
- B23K7/102—Auxiliary devices, e.g. for guiding or supporting the torch for controlling the spacial relationship between the workpieces and the gas torch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
- B23K7/105—Auxiliary devices, e.g. for guiding or supporting the torch specially adapted for particular geometric forms
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Abstract
The invention discloses a flame cutting process for reducing the depth of a heat affected zone for cutting an H-shaped steel web, and belongs to the technical field of steel structure processing. The invention firstly depends on the thickness T of the web plate of the H-shaped steel1Calculating the cutting height Y by the following formula: when T is more than or equal to 6mm1When the diameter is less than or equal to 18mm, the height Y of the cutting nozzle is 0.25T1+180/T1(ii) a When 18mm < T1When the diameter is less than or equal to 40mm, the height Y of the cutting nozzle is 6+ 180/(T)1-5); after the height of the cutting nozzle is adjusted, the cutting speed V is determined according to the thickness T1 of the web of the H-shaped steel and the height Y of the cutting nozzle, and the calculation formula is as follows: when T is more than or equal to 6mm1Not more than 18mm, and the cutting speed V is 0.28Y + 5; when 18mm < T1Not more than 40mm, and cutting speed V is 6Y/T1(ii) a Wherein the unit of cutting speed is millimeter second, and the calculation result is rounded. The invention aims to solve the problem that the depth of a heat affected zone in the existing H-shaped steel flame cutting process is larger, and provides a method for reducing the depth of the heat affected zone in flame cuttingThe flame cutting process effectively reduces the secondary machining allowance of actual machining, reduces equipment and labor investment and improves the machining efficiency.
Description
Technical Field
The invention relates to the technical field of steel structure processing, in particular to a flame cutting process for reducing the depth of a heat affected zone for cutting an H-shaped steel web.
Background
With the rapid development of economy, the basic engineering construction of China also obtains rapid and vigorous development. At present, structural steel in domestic market is mainly steel plate, and welding, riveting, bolting and the like are used as connection modes, so that the steel is a main form for domestic engineering structure construction. However, with the development of new materials, new processes and new technologies, H-beam steel is gradually approved by engineering design and construction units due to its advantages of reasonable strength-to-weight ratio, high precision, small residual stress, large bearing capacity, etc.
In addition, with the implementation of some large engineering designs in recent years, the demand for splitting H-shaped steel into T-shaped steel is increasing. The flame cutting process is a commonly used thermal cutting method in the field of steel structure processing at present, and particularly for bridge engineering and deep sea channel engineering using split T-shaped steel as a structural support, the flame cutting is usually adopted to cut a web plate of H-shaped steel along a rolling direction to form two equal or unequal T-shaped steel so as to meet the use requirements of punching, riveting and the like on the web plate part in the actual engineering. However, after the H-beam web is flame cut, the structure and properties of the material near the cut are changed by high-temperature processing, and this changed region is called a heat affected zone of flame cutting, and the structure and properties of this changed region are greatly different from those of the base material. In order to meet the integrity and stability of actual material performance, for some structural steel members needing secondary processing such as punching, riveting and the like, the heat affected zone of the H-shaped steel web after flame cutting needs to be turned by machining. Therefore, for the flame cutting process, under the condition that secondary machining is inevitably carried out, the reduction of the depth of the flame cutting heat affected zone can effectively reduce the workload of actual machining.
In order to reduce the influence of flame cutting on the depth of the cutting heat affected zone of the H-shaped steel web plate, the invention sets a stable cutting process by setting different cutting speeds and cutting heights according to the thickness of the web plate, thereby achieving the purpose of reducing the depth of the heat affected zone.
Through retrieval, a great number of patents have been published on reducing the influence of flame cutting on the depth of a heat affected zone for cutting an H-shaped steel web, such as Chinese patent application No.: 2011104548524, the name of invention creation is: a flame cutting process for an ultra-thick steel plate discloses a flame cutting process for a thick steel plate, which adopts a numerical control flame cutting machine to perform flame cutting on the ultra-thick steel plate; the steel plate to be cut is placed on a numerical control flame cutting machine, the flame intensity of a cutting nozzle is adjusted by setting cutting parameters (such as preheating time, preheating oxygen pressure, cutting oxygen pressure and propane pressure) in the numerical control flame cutting machine, the steel plate is preheated at a cutting point before cutting, cutting oxygen is opened after the set preheating time is reached, when slag flows downwards along the edge, a cutting torch is moved forwards, when the slag is discharged from the bottom, the moving speed of the cutting torch is accelerated to normal cutting operation, and the cutting torch can cut the extra-thick steel plate with the thickness of 200-600 mm. The scheme relates to a cutting process of thick steel plates, adopts numerical control flame cutting, and is greatly different from semi-automatic flame cutting adopted by the invention; in addition, the main cutting object of the invention is an H-shaped steel product, and the research objects have larger differences.
Also as in chinese patent application No.: 2017112981581, the name of invention creation is: a flame cutting process of a medium-high carbon steel plate discloses a flame cutting process of a medium-high carbon steel plate, which adopts a numerical control flame cutting machine, sets cutting parameters according to the thickness value of the steel plate, adjusts the flame intensity of a cutting nozzle, enables the length of secondary flame to reach the bottom of the steel plate to be cut, and cuts the steel plate after the set preheating time is reached; and stacking and slow cooling or high-temperature tempering are carried out after the steel plate is cut. The scheme mainly comprises the step of cutting medium and high carbon steel plates with the thickness of 50-250 mm, the cutting method is greatly different from the method for cutting the H-shaped steel web with the thickness of 6-40 mm, heat treatment such as slow cooling is not needed after cutting, the cutting efficiency is high, and the cost is low.
Also as in chinese patent application No.: 2013100837806, the name of invention creation is: a flame cutting process for the steel plate of ultra-thick medium-or high-carbon steel or alloy steel features that a small-carriage flame cutting machine is used, the flame cutting procedure with low temp. is controlled, and the preheating, cutting, low-speed cutting and insulating treatment are used to prevent the generation of crack in flame cutting procedure, improve the quality of steel and meet the technological requirements. The scheme mainly aims at some steel plate materials with thicker specifications and higher alloy content, and the cracks generated by flame cutting are mainly controlled through a heat treatment process in the cutting process.
The invention is mainly set by the process, aims to reduce the depth of a heat affected zone formed by the material after flame cutting, has great difference with the research direction and the purpose of the patent, and the whole process of the scheme needs a temperature control process (preheating-belt temperature-heat preservation), has higher processing cost and lower processing efficiency.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problem that the depth of a heat affected zone in the existing H-shaped steel flame cutting process is larger, and provides the flame cutting process for reducing the depth of the flame cutting heat affected zone.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
according to the flame cutting process for reducing the depth of the cutting heat affected zone of the H-shaped steel web, the cutting nozzle height and the cutting speed of the flame cutting machine are adjusted according to the thickness of the H-shaped steel web under the condition that the pressure of flame cutting gas is ensured, so that a stable cutting process is realized, and the specific adjusting process is as follows:
(1) before flame cutting, the cutting torch is vertically abutted against the upper surface of the web plate of the H-shaped steel, and the height of the cutting torch is zero by taking the cutting torch as a horizontal datum line;
(2) firstly according to the thickness T of the web plate of the H-shaped steel1Calculating the cutting height Y by the following formula: when T is more than or equal to 6mm1When the diameter is less than or equal to 18mm, the height Y of the cutting nozzle is 0.25T1+180/T1(ii) a When 18mm < T1When the diameter is less than or equal to 40mm, the height Y of the cutting nozzle is 6+ 180/(T)1-5); wherein the height unit of the cutting nozzle is millimeter, and the calculation result is rounded up;
(3) after the height of the cutting nozzle is adjusted, the cutting speed V is determined according to the thickness T1 of the web of the H-shaped steel and the height Y of the cutting nozzle, and the calculation formula is as follows: when T is more than or equal to 6mm1Not more than 18mm, and the cutting speed V is 0.28Y + 5; when 18mm < T1Not more than 40mm, and cutting speed V is 6Y/T1(ii) a Wherein the unit of cutting speed is millimeter second, and the calculation result is rounded.
As a further improvement of the invention, an oxygen-propane gas flame is adopted, the oxygen pressure range is adjusted to be 0.5MPa to 0.6MPa, and the propane gas pressure range is adjusted to be 0.2MPa to 0.3 MPa.
As a further improvement of the invention, after the parameters are adjusted, ignition preheating is started, the preheating time is 15-30 s, and then flame cutting is carried out on the H-shaped steel web.
As a further improvement of the invention, the thickness range of the H-shaped steel web plate is 6-40 mm, the adjustable range of the cutting height of the flame cutting equipment is 0-30 mm, and the adjustable range of the cutting speed is 0-15 mm/s.
As a further improvement of the invention, the depth range of the heat affected zone of the cutting area of the H-shaped steel web obtained under the flame cutting parameters is 2.1 mm-4.2 mm.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the flame cutting process for reducing the depth of the heat affected zone for cutting the H-shaped steel web, two operation process factors with the largest influence, convenience and feasibility, such as the height Y of the cutting nozzle and the cutting speed V are extracted by combining the influence parameters in the actual process setting, the optimal process setting of the H-shaped steel web during flame cutting is determined, the cutting precision is ensured, the minimum depth of the heat affected zone is obtained, the machining allowance of the secondary cutting of the section is effectively reduced, and the machining efficiency is improved.
(2) According to the flame cutting process for reducing the depth of the cutting heat affected zone of the H-shaped steel web, the flame cutting flame core is stable, and the cutting flame is not interrupted or the track is not unstable in the cutting process. And (3) inspecting the cut web plate, wherein the cutting area has no adverse phenomena such as concentrated slag, notch overburning and the like, and the control of the cutting height and the cutting speed in the whole cutting process is stable, and the quality of the cut surface is good.
Drawings
FIG. 1 is a metallographic microstructure in a region 1 of a heat affected zone on a web of H-shaped steel after flame cutting according to the present invention;
FIG. 2 is a metallographic microstructure in a region 2 of a heat affected zone on a web of H-beam steel after flame cutting according to the present invention;
FIG. 3 is a metallographic microstructure in a region 3 of a heat affected zone on a web of H-beam steel after flame cutting according to the present invention;
FIG. 4 is a metallographic microstructure in a region 4 of a heat affected zone on a web of H-beam steel after flame cutting according to the present invention;
FIG. 5 is a metallographic microstructure in a region 5 of a heat affected zone on a web of H-beam steel after flame cutting according to the present invention.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
According to the flame cutting process for reducing the depth of the cutting heat affected zone of the H-shaped steel web, under the condition that the pressure of flame cutting gas is ensured, the height and the cutting speed of a cutting nozzle of the flame cutting machine are adjusted according to the thickness of the H-shaped steel web, so that the stable cutting process is realized, and the specific adjusting process is as follows:
(1) before flame cutting, the cutting torch is vertically abutted against the upper surface of the web plate of the H-shaped steel, and the height of the cutting torch is zero by taking the cutting torch as a horizontal datum line, namely the initial height of the cutting torch is zero when the cutting torch is abutted against the upper surface of the web plate of the H-shaped steel;
(2) firstly according to the thickness T of the web plate of the H-shaped steel1Calculating the cutting height Y by the following formula: when T is more than or equal to 6mm1When the diameter is less than or equal to 18mm, the height Y of the cutting nozzle is 0.25T1+180/T1(ii) a When 18mm < T1When the diameter is less than or equal to 40mm, the height Y of the cutting nozzle is 6+ 180/(T)1-5); wherein the height unit of the cutting nozzle is millimeter (mm), and the calculation result is rounded off;
(3) after the height of the cutting nozzle is adjusted, the cutting speed V is determined according to the thickness T1 of the web of the H-shaped steel and the height Y of the cutting nozzle, and the calculation formula is as follows: when T is more than or equal to 6mm1Not more than 18mm, and the cutting speed V is 0.28Y + 5; when 18mm < T1Not more than 40mm, and cutting speed V is 6Y/T1(ii) a Wherein the cutting speed is in millimeter seconds (mm/s), and the calculation result is rounded by rounding.
In the embodiment, oxygen-propane gas flame is adopted, the oxygen pressure range is adjusted to be 0.5MPa to 0.6MPa, and the propane gas pressure range is adjusted to be 0.2MPa to 0.3 MPa. After the parameters are adjusted according to the thickness of the H-shaped steel web, ignition preheating is started, preheating time is 15-30 s, then flame cutting is carried out on the H-shaped steel web, and the H-shaped steel web is cut by linearly walking along the length direction of the H-shaped steel web. The thickness range of the H-shaped steel web plate in the embodiment is 6 mm-40 mm, namely, in the embodiment, flame cutting parameters are mainly adjusted according to the thickness of the H-shaped steel web plate between 6 mm-40 mm, and the H-shaped steel web plate is not suitable for being used when the thickness exceeds the range. Therefore, the adjustable range of the cutting height of the flame cutting equipment in the embodiment is 0-30 mm, and the adjustable range of the cutting speed is 0-15 mm/s. The depth range of the heat affected zone of the cutting area of the H-shaped steel web obtained under the flame cutting parameters is 2.1-4.2 mm, in the embodiment, the height Y and the cutting speed V of the cutting nozzle, which are the most influential, convenient and feasible operation process elements, are extracted in combination with the influence parameters in the actual process setting, the optimal process setting of the H-shaped steel web during flame cutting is determined, the cutting precision is ensured, the minimum depth of the heat affected zone is obtained, the machining allowance of the secondary cutting of the section is effectively reduced, and the machining efficiency is improved.
By observing the metallographic microstructure of the heat affected zone of the H-shaped steel web under different flame cutting process parameters, the metallographic structure of the innermost part of the heat affected zone close to the internal normal structure is shown in figure 5, namely the base material zone, and the material does not have the structure transformation due to the smaller heat value in the base material zone. As can be seen from table 5, when the flame cutting process is actually performed, due to the large heat flow density, a superheated zone (i.e., zone 1) is formed at the outermost end of the slit, and due to the large temperature in this zone, during the structure transformation, the primary austenite grains grow large, and a widmannstatten structure with many parallel ferrite and cementite needle pieces is formed in the coarse austenite grains; as the slit ends transition to the inner region, martensitic transformation occurs, eventually forming acicular ferrite and martensite structures (i.e., region 2); as the parent material region approaches, a massive ferrite structure is formed at the prior austenite grain boundary, and massive ferrite, a small amount of martensite, and a very small amount of acicular ferrite are finally formed in the structure (i.e., region 3); in the region closest to the base material (i.e., region 4), the temperature drop is small, and the structure is mainly composed of bulk ferrite and a very small amount of martensite. The depth of a heat affected zone generated during flame cutting, namely the depth of the area 1, the area 2, the area 3 and the area 4, is reduced, the influence of flame cutting on the H-shaped steel web is reduced, and the secondary processing amount is reduced.
TABLE 5 tissue composition of heat affected zone for different cutting processes
| Region(s) | Tissue of |
| 1 | Widmannstatten structure |
| 2 | Acicular ferrite + martensite |
| 3 | Massive ferrite, a small amount of martensite and a very small amount of acicular ferrite |
| 4 | Bulk ferrite + very small amount of martensite |
| 5 | Bulk ferrite + pearlite |
Specifically, the flame cutting specification in the embodiment is Q235B brand H596 × 199 × 10 × 15 hot-rolled H-shaped steel, wherein the thickness T of a web plate of the H-shaped steel110 mm. Before flame cutting, the track plane of the cutting equipment and the height Y of the cutting nozzle are adjusted to ensure that the distance between the cutting nozzle Y and the upper surface of the web plate of the H-shaped steel is zero, namely the height Y of the cutting nozzle for flame cutting is zero. The thickness T of the web plate of the H-shaped steel1Is 10mm, according to the formula Y0.25T1+180/T1Calculating the height Y of the cutting nozzle to be 21mm, and then cutting according to the height Y of the cutting nozzle and the cutting thickness T1And the thickness T of the web of the H-shaped steel1The flame cutting speed V was calculated to be 11mm/s using the formula V0.28Y + 5. Setting the actual cutting process according to the calculated height Y of the cutting nozzle and the cutting speed V, andand cutting the web plate of the H-shaped steel. The oxygen pressure was adjusted to 0.5MPa and the propane gas pressure to 0.2 MPa. After the parameters are adjusted according to the thickness of the H-shaped steel web, ignition preheating is started, preheating time is 15s, then flame cutting is carried out on the H-shaped steel web, and the H-shaped steel web is cut by linearly walking along the length direction of the H-shaped steel web. And observing a flame cutting slit area of the cut H-shaped steel web plate, wherein the web plate is cut thoroughly, the cutting surface is flat, and the bad conditions of slag adhesion and the like do not occur, wherein the depth of a cutting heat affected zone is 3.5 mm.
Example 2
The flame cutting process for reducing the depth of the cutting heat affected zone of the H-shaped steel web plate in the embodiment is basically the same as that in the embodiment 1, the difference is that the flame cutting specification in the embodiment is Q355B brand H414 × 405 × 18 × 28mm hot-rolled H-shaped steel, wherein the thickness T of the H-shaped steel web plate is1＝18mm。
Before flame cutting, the track plane of the cutting equipment and the height Y of the cutting nozzle are adjusted to ensure that the distance between the cutting nozzle and the upper surface of the H-shaped steel web is zero, namely the height Y of the initial cutting nozzle for flame cutting is zero. The thickness T of the web plate of the H-shaped steel1Is 18mm, according to the formula Y0.25T1+180/T1Calculating the height Y of the cutting nozzle to be 15mm, and then cutting according to the height Y of the cutting nozzle and the cutting thickness T1And calculating the flame cutting speed V to be 9mm/s by combining the formula V of 0.28Y + 5. And setting the actual cutting process and cutting the H-shaped steel web according to the calculated cutting nozzle height Y and the cutting speed V. The oxygen pressure was adjusted to 0.55MPa and the propane gas pressure to 0.25 MPa. After the parameters are adjusted according to the thickness of the H-shaped steel web, ignition preheating is started, preheating time is 20s, then flame cutting is carried out on the H-shaped steel web, and the H-shaped steel web is cut by linearly walking along the length direction of the H-shaped steel web. And observing a flame cutting slit area of the cut H-shaped steel web plate, wherein the web plate is cut thoroughly, the cutting surface is flat, and the bad conditions of slag adhesion and the like do not occur, wherein the depth of a cutting heat affected zone is 2.3 mm.
Example 3
Flame for reducing depth of cutting heat affected zone of H-shaped steel web plateThe cutting process is substantially the same as that of example 1, except that in this example, the flame cutting specification is S355J0 brand H458 × 417 × 30 × 50mm hot-rolled H-shaped steel, and the thickness T of the web of the H-shaped steel is1＝30mm。
Before flame cutting, the track plane of the cutting equipment and the height Y of the cutting nozzle are adjusted to ensure that the distance between the cutting nozzle and the upper surface of the web plate of the H-shaped steel is zero, namely the height Y of the initial cutting nozzle for flame cutting is zero. The thickness T of the web plate of the H-shaped steel1Is 30mm, according to the formula Y6 + 180/(T)1-5) calculating the cutting tip height Y to be 13mm, then combining the formula V6Y/T according to the flame cutting height and the cutting thickness1The flame cutting speed V was calculated to be 3 mm/s. And setting the actual cutting process and cutting the H-shaped steel web according to the calculated cutting nozzle height Y and the cutting speed V. The oxygen pressure was adjusted to 0.6MPa and the propane gas pressure to 0.3 MPa. After the parameters are adjusted according to the thickness of the H-shaped steel web, ignition preheating is started, preheating time is 30s, then a flame cutting seam cutting area of the cut H-shaped steel web is observed, cutting of the web is thorough, the cutting surface is flat, bad conditions such as slag adhesion and the like do not occur, and the depth of a cutting heat affected zone is 4.1 mm.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (5)
1. A flame cutting process for reducing the depth of a heat affected zone for cutting an H-shaped steel web is characterized in that: under the condition of ensuring the gas pressure of flame cutting, the height and the cutting speed of a cutting nozzle of the flame cutting machine are adjusted according to the thickness of the H-shaped steel web plate, so that a stable cutting process is realized, and the specific adjusting process is as follows:
(1) before flame cutting, the cutting torch is vertically abutted against the upper surface of the web plate of the H-shaped steel, and the height of the cutting torch is zero by taking the cutting torch as a horizontal datum line;
(2) firstly according to the thickness T of the web plate of the H-shaped steel1Calculating the cutting height Y by the following formula: when T is more than or equal to 6mm1When the diameter is less than or equal to 18mm, the height Y of the cutting nozzle is 0.25T1+180/T1(ii) a When 18mm < T1When the diameter is less than or equal to 40mm, the height Y of the cutting nozzle is 6+ 180/(T)1-5); wherein the height unit of the cutting nozzle is millimeter, and the calculation result is rounded up;
(3) after the height of the cutting nozzle is adjusted, the cutting speed V is determined according to the thickness T1 of the web of the H-shaped steel and the height Y of the cutting nozzle, and the calculation formula is as follows: when T is more than or equal to 6mm1Not more than 18mm, and the cutting speed V is 0.28Y + 5; when 18mm < T1Not more than 40mm, and cutting speed V is 6Y/T1(ii) a Wherein the unit of cutting speed is millimeter second, and the calculation result is rounded.
2. The flame cutting process for reducing the depth of the cutting heat affected zone of the H-shaped steel web plate as claimed in claim 1, wherein: adopting oxygen-propane gas flame, and adjusting the oxygen pressure range to be 0.5 MPa-0.6 MPa and the propane gas pressure range to be 0.2 MPa-0.3 MPa.
3. The flame cutting process for reducing the depth of the cutting heat affected zone of the H-shaped steel web plate as claimed in claim 2, wherein: after the parameters are adjusted, ignition preheating is started, preheating time is 15-30 s, and then flame cutting is carried out on the H-shaped steel web.
4. The flame cutting process for reducing the depth of the cutting heat affected zone of the H-shaped steel web plate as claimed in claim 1, wherein: the thickness range of the H-shaped steel web plate is 6-40 mm, the adjustable range of the cutting height of the flame cutting equipment is 0-30 mm, and the adjustable range of the cutting speed is 0-15 mm/s.
5. The flame cutting process for reducing the depth of the cutting heat affected zone of the H-shaped steel web plate according to any one of claims 1 to 4, characterized in that: the depth range of the heat affected zone of the cutting area of the H-shaped steel web obtained under the flame cutting parameters is 2.1 mm-4.2 mm.
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