CN110252833B - Drawing process and application of high-strength steel welding wire with weight of less than 70 kg, weight of 70 kg and weight of more than 70 kg - Google Patents

Drawing process and application of high-strength steel welding wire with weight of less than 70 kg, weight of 70 kg and weight of more than 70 kg Download PDF

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Publication number
CN110252833B
CN110252833B CN201910596353.5A CN201910596353A CN110252833B CN 110252833 B CN110252833 B CN 110252833B CN 201910596353 A CN201910596353 A CN 201910596353A CN 110252833 B CN110252833 B CN 110252833B
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welding wire
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drawing process
kilograms
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CN110252833A (en
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侯云昌
李振建
孙得印
姜雪
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Tianjin Golden Bridge Welding Materials Group Co Ltd
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Tianjin Yongchang Welding Wire Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/02Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C43/00Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass
    • B21C43/02Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass combined with or specially adapted for use in connection with drawing or winding machines or apparatus
    • B21C43/04Devices for de-scaling wire or like flexible work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent

Abstract

The invention provides a drawing process and application of high-strength steel welding wires of less than 70 kilograms and above, wherein the drawing process of the high-strength steel welding wires of less than 70 kilograms and above adopts an acid-free derusting machine to draw the welding wires, and the drawing process comprises the following steps: (1) programming the rotating speed of the pickling-free rust remover; (2) the inlet end of the pickling-free derusting machine is additionally provided with a 90-110 mesh abrasive belt, and the outlet end is additionally provided with a 110-plus-130 mesh abrasive belt; (3) the drawability of the wire rod is ensured, the power of the pickling-free rust removing motor is changed from 22kw to 30-37kw of the first motor, and the rest motors are all 20-28kw, so that the power during drawing is increased; (4) and formulating the proportion of the die according to the change of the compression ratios of the welding wires with different strengths, and performing a rough drawing process and a fine drawing process. The drawing process of the high-strength steel welding wire with the weight of less than 70 kilograms, 70 kilograms and more than 70 kilograms can reduce the production cost, improve the production capacity and enhance the market competitiveness.

Description

Drawing process and application of high-strength steel welding wire with weight of less than 70 kg, weight of 70 kg and weight of more than 70 kg
Technical Field
The invention belongs to the technical field of welding wire production, and particularly relates to a drawing process of a high-strength steel welding wire with the grade of less than 70 kilograms, 70 kilograms or more and application of the welding wire produced by the drawing process.
Background
With the rapid development of manufacturing industry, high-strength steel has the advantages of high strength, capability of bearing heavy load, large pressure and the like, and is favored in large-scale welding structural parts such as ships, oil and gas pipelines, strength-quantified vehicle bodies and the like. Aiming at the market demand, the high-strength steel products developed by our company mainly comprise 4 series of 60 kg grade, 70 kg grade, 80 kg grade and 90 kg grade, and 4 products sell 2000 tons each year. The rapid development of high-strength steel welding wires is a strategic target of our department and is also a necessary trend of the development of welding wires in future. However, because an annealing process is required in the production of the high-strength welding wire at present, the process has the defects of high production cost, high labor intensity, long supply period and the like, and the development of the high-strength steel solid welding wire is severely restricted. In order to solve the problems, a non-annealing drawing process of 70 kg or less products is implemented to reduce the production cost, improve the production capacity and enhance the market competitiveness.
Disclosure of Invention
In view of the above, the present invention aims to provide a drawing process for a high strength steel welding wire of less than 70 kg, 70 kg and above to overcome the defects of the prior art, wherein annealing treatment can be avoided for products of less than 70 kg, and pre-drawing is performed on products of more than 70 kg before annealing treatment, so that production cost can be reduced, production capacity can be improved, and market competitiveness can be enhanced.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the drawing process of the high-strength steel welding wire with the weight of 70 kilograms or more is characterized in that an acid-free derusting machine is adopted for drawing the welding wire, and the drawing process comprises the following steps:
(1) programming the rotating speed of the pickling-free rust remover: controlling the initial rotating speed of the pickling-free rust remover to be 500-700r/min in the test process, increasing the rotating speed once every 1 ton of produced welding wires, and increasing the rotating speed by 30-80r/min every time;
(2) adding a 90-110 mesh abrasive belt at the inlet end of the pickling-free derusting machine, adding a 110-plus-130 mesh abrasive belt at the outlet end, further derusting and polishing the surface of the wire rod subjected to preliminary derusting, and ensuring the subsequent copper plating quality of the welding wire; preferably, a 100-mesh abrasive belt is additionally arranged at the inlet end of the pickling-free derusting machine, and a 120-mesh abrasive belt is additionally arranged at the outlet end of the pickling-free derusting machine;
(3) the drawability of the wire rod is ensured, the power of all motors of the pickling-free deruster is changed from 22kw to 30-37kw of the first motor, and the power of the other motors is changed from 20-28kw, so that the power during drawing is increased; preferably, the power of all motors of the pickling-free rust remover is changed from 22kw to 35kw of the first motor, and the rest motors are 27 kw;
(4) and formulating the proportion of the die according to the change of the compression ratios of the welding wires with different strengths, and performing a rough drawing process and a fine drawing process.
Preferably, the welding wire is a low-alloy high-strength welding wire, wherein: the chemical composition of the 70 kg high-strength steel welding wire is as follows: less than or equal to 0.11wt% of C, 1.4-1.9 wt% of Mn, less than or equal to 0.8 wt% of Si, less than or equal to 0.025 wt% of S, less than or equal to 0.025 wt% of P, 0.5-1.55 wt% of Ni, 0.2-0.6 wt% of Mo, less than or equal to 0.16 wt% of Ti, less than or equal to 0.3 wt% of Cr, less than or equal to 0.5 wt% of Cu, less than or equal to 0.5 wt% of other elements, and the; the chemical composition of the 80 kg high-strength steel welding wire is as follows: less than or equal to 0.11 weight percent of C, 1.4 to 1.85 weight percent of Mn, 0.40 to 1.00 weight percent of Si, less than or equal to 0.025 weight percent of S, less than or equal to 0.025 weight percent of P, 0.25 to 0.60 weight percent of Cr0, 1.20 to 2.40 weight percent of Ni1.2 to 0.6 weight percent of Mo, less than or equal to 0.5 weight percent of Cu, less than or equal to 0.5 weight percent of other elements, and the balance of Fe; the diameter of the wire rod is 5.45-5.75 mm.
Preferably, in the step (1), the selection optimization of the initial rotating speed of the pickling-free derusting machine in the control test process is determined through tests, specifically, the initial speed is increased by 50r/min, the test initial speed is 200-800 r/min, and a proper initial speed range is selected and determined; through experimental screening, the initial speed can reach the requirement at 500-700 r/min; more preferably, the initial rotating speed of the pickling-free rust remover is controlled to be 600 r/min.
Preferably, in the step (1), the rotation speed of the welding wire is increased once per 1 ton of produced welding wire, and the specific increase is determined according to test screening, for example, the rotation speed is increased by 10-80 r/min in an increasing manner by 5 r/min, and after the test screening, the rotation speed is increased once per 1 ton of produced welding wire, and the increase of 30-80r/min can basically meet the requirement, but is more preferably 50 r/min.
Preferably, in the step (2), the selection of the 100-mesh abrasive belt and the 120-mesh abrasive belt is based on that the scale on the surface of the wire rod under rough drawing is removed cleanly and has no scratch when observed by a 10-fold microscope.
Preferably, in the step (4), the wire of 70 kg or less is roughly drawn for 7 times, the diameter of the wire is changed from 5.45-5.75mm to 2.60mm, and the compression ratio is 0.1-0.14.
Preferably, in the step (4), the first drawing lubricant of the wire rough drawing process of 70 kg or below is G48 calcium-based lubricant, the last 6 drawing lubricants are G88 sodium-based lubricant, and the 7 drawing speed is between 0.8 and 4.5 m/s.
Preferably, in the step (4), the welding wire of more than 70 kg is subjected to 8 times of drawing in the rough drawing process, the diameter of the welding wire is changed from 5.45-5.75mm to 3.10mm, the compression ratio is 0.03-0.11, G48 calcium-based lubricating powder is adopted as the lubricating powder for the first drawing, G88 sodium-based lubricating powder is adopted as the lubricating powder for the last 7 times of drawing, the drawing speed for 8 times is 0.8-5m/s, and annealing treatment is additionally arranged between the previous drawing and the next drawing or between the previous drawing and the next drawing.
Preferably, in the step (4), the welding wire fine drawing process of 70 kg and below is performed for 8 times, the diameter of the welding wire is changed from 2.60mm to 1.23mm, the compression ratio is 0.07-0.09, G88 sodium-based lubricating powder is adopted in each 8 times of drawing, and the 8 times of drawing speed is 2.7-8 m/s.
Preferably, in the step (4), the welding wire with the grade of more than 70 kilograms is finely drawn for 8 times, the diameter of the welding wire is changed from 3.10mm to 1.23mm, the compression ratio is 0.04-0.15, G88 sodium-based lubricating powder is adopted in all 8 times of drawing, and the drawing speed is 2.7-8m/s in all 8 times of drawing.
The invention also relates to the application of the welding wire produced by the drawing process of the high-strength steel welding wire with the weight of less than 70 kg, 70 kg and more in the fields of pressure containers, engineering machinery, hoisting machinery, bridges, pipelines, ships and mining machinery
Compared with the prior art, the drawing process of the high-strength steel welding wire with the weight of 70 kilograms or more and less has the following advantages:
the drawing process of the high-strength steel welding wire with the weight of less than 70 kilograms, the weight of 70 kilograms and more realizes non-annealing production of products with the weight of less than 70 kilograms, reduces the production cost of the welding wire by more than 500 yuan per ton, shortens the production period by 3 days, and obviously improves the manufacturability of welding wire such as welding spatter, arc stability, forming and the like; meanwhile, the 3-4 times of rough drawing before the annealing treatment can be regarded as pre-drawing of products with the weight of more than 70 kilograms. The project is that the high-strength steel solid welding wire has higher market competitiveness.
The drawing process of the high-strength steel welding wire with the diameter of less than 70 kilograms and more than 70 kilograms can produce the gas shield welding wire with the diameter of 0.8-1.6mm and the argon arc welding wire with the diameter of 1.6-4.8 mm.
Drawings
FIG. 1 is a photograph of a copper film of the wire of example 1.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following examples and accompanying drawings.
The drawing process of the high-strength steel welding wire with the weight of 70 kilograms or more is characterized in that an acid-free derusting machine is adopted for drawing the welding wire, and the drawing process comprises the following steps:
(1) according to the principle that the rotating speed of a new abrasive belt is low and is gradually increased along with the production and the abrasion of the abrasive belt, the rotating speed of a pickling-free rust remover (hereinafter referred to as an abrasive belt machine) is programmed to ensure that the rust removing effect of a wire rod is not influenced by the service time and the abrasion degree of the abrasive belt. Specifically, the initial rotating speed of the pickling-free rust remover in the test process is controlled to be 200-800 r/min, the initial rotating speed is gradually increased to 800r/min from 200 r/min by the increase of 50r/min, and the initial rotating speed is screened and determined. Experiments show that the requirement can be basically met when the initial rotating speed is 500-700 r/min. Meanwhile, tests also find that when the rotating speed is lower than 600r/min, the surface of the wire rod is not seriously scratched, but the surface of a subsequent welding wire is blackened due to unclean cleaning, the welding manufacturability is poor, and the splashing is large. When the rotating speed is higher than 600r/min, the surface of the wire rod can be cleaned, but scratches are slightly more and the cost is increased, so the initial rotating speed is selected to be most preferably 600r/min in comprehensive consideration. In the test process, the wire rod is not completely removed after a certain amount of wire rod is drawn, and the cleaning capability of the sander is reduced after 1 ton of welding wire is produced in the drawing process, so that the rotating speed is increased in the test from high to low, the rotating speed is increased from 5 r/min each time until the rotating speed is increased to 10-80 r/min each time when the rotating speed is increased by one time when 1 ton of welding wire is produced. Tests prove that the requirement can be basically met when the rotating speed is increased by 30-80r/min every 1 ton of welding wires are produced, but the rotating speed increment of automatically increasing the rotating speed of the abrasive cloth belt machine by 50r/min is the highest cost performance on the premise of ensuring that the wire rods are cleaned up.
(2) The inlet end of the pickling-free derusting machine is additionally provided with a 90-110 mesh abrasive belt, the outlet end of the pickling-free derusting machine is additionally provided with a 110-plus-130 mesh abrasive belt, the surface of the wire rod after primary derusting is further derusted and polished, and the subsequent copper plating quality of the welding wire is ensured. And observing the scratch condition of the surface of the wire rod under a high-power microscope, and determining the abrasive belt with the proper mesh number according to the polishing cleanness and the scratch condition of the surface of the wire rod. Observing the surface of the wire rod which is subjected to rough wire drawing through a 10-time microscope, and if the surface of the wire rod is observed to be cleanly removed and has no scratch, judging that the wire rod is qualified. The scratch can be observed by adopting the abrasive belt with the grain size of less than 100 meshes, and the oxide skin is not completely removed by the abrasive belt with the grain size of more than 100 meshes, so that as a better embodiment of the invention, the abrasive belt with the grain size of 100 meshes is additionally arranged at the inlet end of the pickling-free rust remover, the abrasive belt with the grain size of 120 meshes is additionally arranged at the outlet end, the residual rust on the surface of the wire rod can be removed by the abrasive belt with the grain size of 100 meshes, and the scratch cannot be deeply scratched by the abrasive belt with the grain size of.
(3) The drawability of the wire rod is ensured, the power of all motors of the pickling-free deruster is changed from 22kw to 30-37kw of the first motor, and all other motors including the second motor are 20-28kw, so that the power during drawing is increased; more preferably, the power of the pickling-free derusting machine is changed from 22kw to 35kw of the first motor, and the power of the rest motors is changed to 27 kw;
(4) the ratio of the die is made according to the change of the compression ratio of the welding wires with different strengths, the drawing speed is adjusted due to the difference of the strengths, the drawability of the wire is finally realized, the rough drawing process and the fine drawing process are carried out, and the gas shielded welding wire with the diameter of 0.8-1.6mm or the argon arc welding wire with the diameter of 1.6-4.8 is finally obtained.
The welding wire obtained after the drawing process is a low-alloy high-strength welding wire, wherein: the chemical composition of the 70 kg high-strength steel welding wire is as follows: less than or equal to 0.11wt% of C, 1.4-1.9 wt% of Mn, less than or equal to 0.8 wt% of Si, less than or equal to 0.025 wt% of S, less than or equal to 0.025 wt% of P, 0.5-1.55 wt% of Ni, 0.2-0.6 wt% of Mo, less than or equal to 0.16 wt% of Ti, less than or equal to 0.3 wt% of Cr, less than or equal to 0.5 wt% of Cu, less than or equal to 0.5 wt% of other elements, and the; the chemical composition of the 80 kg high-strength steel welding wire is as follows: less than or equal to 0.11 weight percent of C, 1.4 to 1.85 weight percent of Mn, 0.40 to 1.00 weight percent of Si, less than or equal to 0.025 weight percent of S, less than or equal to 0.025 weight percent of P, 0.25 to 0.60 weight percent of CrN, 1.20 to 2.40 weight percent of Nis, 0.2 to 0.6 weight percent of Mo, less than or equal to 0.5 weight percent of Cu, less than or equal to 0.5 weight percent of other elements, and the balance of Fe. The diameter of the wire rod is 5.45-5.75 mm.
In step (4), the wire is roughly drawn by 70 kg and below for 7 times, the diameter of the wire is changed from 5.45-5.75mm (which is also understood as the wire rod diameter) to 2.60mm, and the compression ratio is 0.1-0.14.
In the step (4), in the rough drawing process of the welding wire of 70 kg and below, G48 calcium-based lubricant is used as the first drawing lubricant, G88 sodium-based lubricant is used as the last 6 drawing lubricants, and the drawing speed is between 0.8 and 4.5m/s for 7 times.
As an optional embodiment of the invention, in the step (4), the welding wire fine drawing process of 70 kg and below is performed for 8 times of drawing, the diameter of the welding wire is changed from 2.60mm to 1.23mm, the compression ratio is 0.07-0.09, G88 sodium-based lubricating powder is adopted for 8 times of drawing, and the drawing speed for 8 times is 2.7-8 m/s.
In the step (4), the wire rough drawing process of 70 kg or more is performed for 8 times, the diameter of the wire is changed from 5.45-5.75mm (which can be also understood as the diameter of a wire rod) to 3.10mm, the compression ratio is 0.03-0.11, the G48 calcium-based lubricant powder is adopted as the first drawing lubricant powder, the G88 sodium-based lubricant powder is adopted as the last 7 drawing lubricant powder, the drawing speed is 0.8-5m/s for 8 times, and the annealing treatment is additionally performed between the first drawing and the last drawing or between the first drawing and the last drawing. The first three pulls or the first four pulls before the annealing treatment, which may be referred to as pre-pulls, for welding wires of the grade above 70 kg.
As an optional embodiment of the invention, in the step (4), the welding wire fine drawing process with the grade of more than 70 kilograms is performed for 8 times of drawing, the diameter of the welding wire is changed from 3.10mm to 1.23mm, the compression ratio is 0.04-0.15, G88 sodium-based lubricating powder is adopted in each 8 times of drawing, and the drawing speed for 8 times is 2.7-8 m/s.
The high strength steel wire drawing process of the present invention will be described below with reference to example 1, comparative example 1, example 2 and comparative example 2.
First, examples 1-2 and comparative examples 1-2
Example 1-70 kg grade annealing free wire
The welding wire obtained after drawing is a low-alloy high-strength welding wire, and the chemical composition of the welding wire is as follows: less than or equal to 0.11wt% of C, 1.4-1.9 wt% of Mn, less than or equal to 0.8 wt% of Si, less than or equal to 0.025 wt% of S, less than or equal to 0.025 wt% of P, 0.5-1.55 wt% of Ni, 0.2-0.6 wt% of Mo, less than or equal to 0.16 wt% of Ti, less than or equal to 0.3 wt% of Cr, less than or equal to 0.5 wt% of Cu, less than or equal to 0.5 wt% of other elements, and the rest; the wire rod diameter is 5.5 mm.
The drawing process comprises the following steps:
(1) programming the rotating speed of the pickling-free rust remover: controlling the initial rotating speed of the pickling-free deruster to be 600r/min, and increasing the rotating speed once every 1 ton of produced welding wires by 50 r/min;
(2) a 100-mesh abrasive belt is additionally arranged at the inlet end of the pickling-free derusting machine, a 120-mesh abrasive belt is additionally arranged at the outlet end of the pickling-free derusting machine, the surface of the wire rod subjected to preliminary derusting is further derusted and polished, and the subsequent copper plating quality of the welding wire is ensured;
(3) the drawability of the wire rod is ensured, the power of all motors of the pickling-free rust remover is changed from 22kw to 32kw of the first motor, the power of all other motors including the second motor is changed to 25kw, and the power during drawing is increased;
(4) and formulating the proportion of the die according to the change of the compression ratios of the welding wires with different strengths, and performing a rough drawing process and a fine drawing process. Wherein, the technological parameters in the rough drawing process are shown in table 1, and the technological parameters in the fine drawing process are shown in table 2.
Table 1 rough drawing process parameters for 70 kg welding wire in example 1
TABLE 2 Fine drawing Process parameters for 70 kg wire in example 1
Number of drawing 1 2 3 4 5 6 7 8
Diameter of welding wire (mm) 2.30 2.10 1.90 1.73 1.58 1.44 1.32 1.23
Lubricating powder G88 G88 G88 G88 G88 G88 G88 G88
Compression ratio - 0.09 0.07 0.09 0.09 0.09 0.09 0.07
Drawing speed (m/s) 2.7 3.3 3.9 4.5 5.2 6.1 7.2 8
After a plurality of tests, the welding wire is easy to break when the compression rate is low, and cannot be pulled when the compression rate is too high, so that the die proportions (namely, the process parameter selection) shown in the table 1 and the table 2 are determined after the tests. Too low a speed affects efficiency and too high a speed tends to snap and therefore the drawing speed as indicated in the table above is adopted.
In the embodiment, the former two times of rough drawing, that is, the diameter of the welding wire is changed to 5.20mm after the welding wire is subjected to primary drawing from an initial diameter of 5.5mm (that is, the diameter of a wire rod), and the diameter of the welding wire is changed to 4.7mm after the welding wire is subjected to secondary drawing, and the two times of drawing can be regarded as pretreatment of the welding wire. The fine drawing step was performed such that the diameter became 2.6mm after the 7 th drawing in the rough drawing was set as the initial drawing diameter.
Comparative example 1-70 kg grade annealing welding wire
This comparative example is essentially the same as example 1, except that: after the third drawing diameter in the welding wire rough drawing process is changed to 4.2mm, annealing treatment is added, and the 4 th-7 th rough drawing is carried out after annealing. The specific process and the change condition of the diameter of the welding wire are as follows: coarse drawing (including pretreatment-the first two times of drawing can be regarded as pretreatment) → 4.2mm → annealing → coarse drawing → 2.6mm → fine drawing → 1.23 mm.
Example 2-80 kg Pre-drawn annealing-free wire
The welding wire obtained after drawing is a low-alloy high-strength welding wire, and the chemical composition of the welding wire is as follows: less than or equal to 0.11 weight percent of C, 1.4 to 1.85 weight percent of Mn, 0.40 to 1.00 weight percent of Si, less than or equal to 0.025 weight percent of S, less than or equal to 0.025 weight percent of P, 0.25 to 0.60 weight percent of Cr, 1.20 to 2.40 weight percent of Ni, 0.2 to 0.6 weight percent of Mo, less than or equal to 0.5 weight percent of Cu, less than or equal to 0.5 weight percent of other elements, and the rest elements are iron elements; the wire rod diameter is 5.5 mm.
The drawing process comprises the following steps:
(1) programming the rotating speed of the pickling-free rust remover: controlling the initial rotating speed of the pickling-free deruster to be 650r/min, and increasing the rotating speed once every 1 ton of produced welding wires by 55 r/min;
(2) the inlet end of the pickling-free derusting machine is additionally provided with a 95-mesh abrasive belt, the outlet end of the pickling-free derusting machine is additionally provided with a 125-mesh abrasive belt, the surface of the wire rod which is subjected to preliminary derusting is further derusted and polished, and the subsequent copper plating quality of the welding wire is ensured;
(3) the drawability of the wire rod is ensured, the power of all motors of the pickling-free rust remover is changed from 22kw to 35kw of the first motor, the power of all other motors including the second motor is changed to 27kw, and the power during drawing is increased;
(4) and formulating the proportion of the die according to the change of the compression ratios of the welding wires with different strengths, and performing a rough drawing process and a fine drawing process. Wherein, the technological parameters in the rough drawing process are shown in table 3, and the technological parameters in the fine drawing process are shown in table 4.
TABLE 3 Process parameters for the rough drawing of 80 kg wire in example 2
Number of drawing 1 2 3 4 5 6 7 8
Diameter of welding wire (mm) 5.20 4.70 4.20 3.80 3.50 3.30 3.20 3.10
Lubricating powder G48 G88 G88 G88 G88 G88 G88 G88
Compression ratio - 0.1 0.11 0.10 0.08 0.06 0.03 0.04
Drawing speed (m/s) 0.8 1.1 1.5 2 2.6 3.3 4.5 5
TABLE 4 Process parameters for the fine drawing of 80 kg wire in example 2
Variety of (IV) C 1 2 3 4 5 6 7 8
Diameter of welding wire (mm) 2.10 2.00 1.85 1.75 1.50 1.40 1.32 1.23
Lubricating powder G88 G88 G88 G88 G88 G88 G88 G88
Compression ratio - 0.05 0.08 0.06 0.15 0.07 0.06 0.04
Drawing speed (m/s) 2.7 3.3 3.9 4.5 5.2 6.1 7.2 8
After a plurality of tests, the welding wire is easy to be broken when the compression rate is low, and cannot be pulled when the compression rate is too high, so that the die ratios (namely, the process parameter selection) shown in the table 3 and the table 4 are determined after the tests. Too low a speed affects efficiency and too high a speed tends to snap and therefore the drawing speed as indicated in the table above is adopted.
In the present embodiment, the rough drawing of the wire from the initial diameter of 5.5mm (i.e., the diameter of the wire rod), the first three times (diameter of 4.2 mm) or the first four times (diameter of 3.8mm) of the rough drawing may be regarded as a pre-drawing process, the annealing process is performed, the remaining 5 or 4 times of the rough drawing are performed, the diameter of the wire after the last rough drawing is 3.1mm, and the diameter is used as the initial diameter of the fine drawing to perform the fine drawing.
Comparative example 2-80 kg annealed wire
This comparative example is essentially the same as example 2, except that: in the rough drawing process, the diameter of the welding wire is changed into 3.8mm after six times of rough drawing and is changed into 4.2mm after five times of rough drawing, compared with the embodiment 2, the drawing times of the welding wire before the diameter of the welding wire is 3.8mm or 4.2mm are obviously more, the same diameter is increased by 2 times of drawing processes, and the specific process and the change situation of the diameter of the welding wire are as follows: coarse stretching (5.2 mm-5.1mm-4.7mm-4.5mm-4.2 mm) → 3.8mm/4.2mm → annealing → coarse stretching → 3.1mm → fine stretching → 1.23 mm.
Second, performance detection data after drawing of welding wire
1. Copper film binding force and copper film adhesion after copper plating of welding wire
And observing under a high power microscope after copper plating, and measuring the binding force and the adhesiveness of the copper film to judge whether the new process can meet the quality requirement of the product. Wherein, the binding force of the copper film is observed under a microscope of 10 times after the copper film is wound for 5 circles, and the unqualified copper film is obtained when more scales exist in a large area. The adhesion of the copper film should not have the phenomenon of copper plating layer falling off, the compactness of the copper film should be observed under a microscope of 200 times, and the coverage rate of the copper film is more than 95 percent (the phenomenon that a plating layer is uniform, smooth and compact).
The photograph of the copper film of the wire used in example 1, which was observed under a 200-fold microscope, is shown in FIG. 1.
As can be seen from FIG. 1, the copper film of the welding wire in example 1 after copper plating has almost no scale, has strong binding force, and has uniform, smooth and compact plating layer, which shows that the copper film has good adhesion and compactness.
2. Welding wire self and welding manufacturability comparison, deposited metal mechanical property comparison
The welding wire itself and the welding manufacturability in examples 1-2 and comparative examples 1-2 are compared in Table 5; the mechanical properties of the deposited metal in examples 1 to 2 and comparative examples 1 to 2 are compared in Table 6.
TABLE 5 welding wire itself and welding manufacturability comparison
Welding wire Circle distance (mm) Warping distance (mm) Diameter (mm) Welding wire resistance (kg) Tensile strength of welding wire (MPa)
Comparative example 1 720 0 1.71/1.73 2.1 1409/1403
Example 1 690 0 1.69/1.70 1.8 1524/1525
Comparative example 2 750 0 1.69/1.71 1.9 1520/1514
Example 2 710 0 1.68/1.72 1.8 1512/1510
Efficiency of deposition Weld formation Amount of spatter (g) Contact tip wear (g) Manufacturability of welding
Comparative example 1 97.97% Good effect 0.3231 0.0003 Good effect
Example 1 99.58% Good effect 0.3729 0.0003 Good effect
Comparative example 2 99.56% Good effect 0.3514 0.0004 Good effect
Example 2 99.50 Good effect 0.3411 0.0003 Good effect
TABLE 6 comparison of mechanical Properties of deposited metals
Tensile strength (MPa) Yield strength (MPa) Reduction of area (%) Elongation (%) Impact temperature (. degree.C.) Impact absorption work (J)
Comparative example 1 703 617 71 25 -20 146 126 171 173 153 167
Example 1 722 635 69 25.5 -20 147 164 126 161 182 178
Comparative example 2 851 796 66 21 -20 156 162 158 167 169 171
Example 2 849 795 67 22.5 -20 161 168 164 170 172 171
As can be seen from tables 5 and 6, the annealed welding wire can achieve equivalent mechanical properties and welding manufacturability compared with the annealing-free or pre-drawn annealing-free welding wire, and all indexes of the welding wire are superior to the requirements of the national standard GB/T8110-.
The drawing process can successfully realize non-annealing production of products of 70 kg and below, the production cost of a single ton of welding wires is reduced by more than 500 yuan, the production period is shortened by 3 days, and the manufacturability of welding wire welding spatter, arc stability, forming and the like is obviously improved. In addition, the pre-drawing of products with the weight of more than 80 kilograms can be realized. The drawing process provided by the invention enables the high-strength steel solid welding wire to have market competitiveness.
The high-strength welding wire product provided by the invention is widely applied to the fields of pressure containers, engineering machinery, hoisting machinery, bridges, pipelines, ships, mining machinery and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (5)

  1. The drawing process of the high-strength steel welding wire with the weight of less than 1.70 kg and the weight of 70 kg and above is characterized by comprising the following steps of: the method adopts a pickling-free derusting machine to draw the welding wire, and the drawing process comprises the following steps:
    (1) programming the rotating speed of the pickling-free rust remover: controlling the initial rotating speed of the pickling-free rust remover to be 500-700r/min in the test process, increasing the rotating speed once every 1 ton of produced welding wires, and increasing the rotating speed by 30-80r/min every time;
    (2) a 100-mesh abrasive belt is additionally arranged at the inlet end of the pickling-free derusting machine, a 120-mesh abrasive belt is additionally arranged at the outlet end of the pickling-free derusting machine, the surface of the wire rod subjected to preliminary derusting is further derusted and polished, and the subsequent copper plating quality of the welding wire is ensured;
    (3) the drawability of the wire rod is ensured, the power of all motors of the pickling-free rust remover is changed from 22kw to 35kw of the first motor, the power of the rest motors is 27kw, and the power during drawing is increased;
    (4) according to the change of the compression ratios of the welding wires with different strengths, formulating the proportion of the die, and performing a rough drawing process and a fine drawing process;
    the welding wire is a low-alloy high-strength welding wire, wherein: the chemical composition of the 70 kg high-strength steel welding wire is as follows: less than or equal to 0.11wt% of C, 1.4-1.9 wt% of Mn, less than or equal to 0.8 wt% of Si, less than or equal to 0.025 wt% of S, less than or equal to 0.025 wt% of P, 0.5-1.55 wt% of Ni, 0.2-0.6 wt% of Mo, less than or equal to 0.16 wt% of Ti, less than or equal to 0.3 wt% of Cr, less than or equal to 0.5 wt% of Cu, less than or equal to 0.5 wt% of other elements, and the; the chemical composition of the welding wire of 80 kg high-strength steel with more than 70 kg is as follows: less than or equal to 0.11 weight percent of C, 1.4 to 1.85 weight percent of Mn, 0.40 to 1.00 weight percent of Si, less than or equal to 0.025 weight percent of S, less than or equal to 0.025 weight percent of P, 0.25 to 0.60 weight percent of Cr0, 1.20 to 2.40 weight percent of Ni1.2 to 0.6 weight percent of Mo, less than or equal to 0.5 weight percent of Cu, less than or equal to 0.5 weight percent of other elements, and the balance of Fe; the diameter of the wire rod is 5.45-5.75 mm;
    in the step (4), the welding wire of 70 kg and below is roughly drawn for 7 times, the diameter of the welding wire is changed from 5.45-5.75mm to 2.60mm, the compression rate is 0.1-0.14, and the drawing speed for 7 times is 0.8-4.5 m/s;
    in the step (4), the welding wire rough drawing process of more than 70 kilograms is subjected to 8 times of drawing, the diameter of the welding wire is changed from 5.45-5.75mm to 3.10mm, the compression rate is 0.03-0.11, the drawing speed of 8 times is 0.8-5m/s, and annealing treatment is additionally performed between the previous drawing and the next drawing or between the previous drawing and the next drawing;
    in the step (4), the welding wire of 70 kg and below is finely drawn for 8 times, the diameter of the welding wire is changed from 2.60mm to 1.23mm, the compression ratio is 0.07-0.09, and the drawing speed for 8 times is 2.7-8 m/s;
    in the step (4), the welding wire with the grade of more than 70 kilograms is finely drawn for 8 times, the diameter of the welding wire is changed from 3.10mm to 1.23mm, the compression ratio is 0.04-0.15, and the drawing speed for 8 times is 2.7-8 m/s.
  2. 2. The drawing process of the high-strength steel welding wire with the weight of 70 kilograms or more and less than 70 kilograms according to claim 1, which is characterized in that: in the step (1), the initial rotating speed of the pickling-free rust remover is controlled to be 600 r/min.
  3. 3. The drawing process of the high-strength steel welding wire with the weight of 70 kilograms or more and less than 70 kilograms according to claim 1, which is characterized in that: in the step (1), the rotating speed of each welding wire produced by 1 ton is increased once, and the rotating speed is increased by 50r/min each time.
  4. 4. The drawing process of the high-strength steel welding wire with the weight of 70 kilograms or more and less than 70 kilograms according to claim 1, which is characterized in that: in the step (2), the selection of the 100-mesh abrasive belt and the 120-mesh abrasive belt is based on the principle that the oxide skin on the surface of the wire rod which is roughly pulled off the wire is removed cleanly and has no scratch when observed by a 10-time microscope.
  5. 5. The application of the welding wire produced by the drawing process of the high-strength steel welding wire with the weight of 70 kilograms or less, 70 kilograms or more in the fields of pressure containers, engineering machinery, bridges, pipelines, ships and mining machinery according to any one of claims 1 to 4.
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