CN114769814A - Welding method of hot rolled steel strip on continuous annealing and pickling production line - Google Patents
Welding method of hot rolled steel strip on continuous annealing and pickling production line Download PDFInfo
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- CN114769814A CN114769814A CN202210529944.2A CN202210529944A CN114769814A CN 114769814 A CN114769814 A CN 114769814A CN 202210529944 A CN202210529944 A CN 202210529944A CN 114769814 A CN114769814 A CN 114769814A
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H19/00—Changing the web roll
- B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
- B65H19/20—Cutting-off the expiring web
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H19/00—Changing the web roll
- B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
- B65H19/26—Cutting-off the web running to the wound web roll
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
Abstract
The invention discloses a welding method of a hot-rolled steel strip on a continuous annealing and pickling production line, which comprises the following steps: step 1, butt-jointing a material tail of a first hot-rolled steel strip with a first end of a leading strip, and welding a main welding seam by adopting an MIG welding machine; step 2, vertically lapping the two lapping strips on the main welding seam, and welding by adopting manual arc welding, so that the material tail of the first hot-rolled steel strip is welded with the first end of the leading strip; step 3, butting the stub bar of the second hot-rolled steel strip with the second end of the leading belt, and welding the stub bar of the second hot-rolled steel strip with the second end of the leading belt by adopting the methods in the step 1 and the step 2; and 4, tempering the welded joint between the first hot-rolled steel strip and the second hot-rolled steel strip. The welding method can effectively solve the problems of poor welding performance and easy cracking of the hot rolled steel strip.
Description
Technical Field
The invention relates to the technical field of hot rolled steel strip welding, in particular to a welding method of a hot rolled steel strip on a continuous annealing and pickling production line.
Background
The 6Cr13 is a martensitic stainless steel with high hardness, the carbon content reaches 0.6-0.7%, and the hardness can reach more than HRC58 after proper heat treatment. The carbide particles of the 6Cr13 are fine and dispersed, no coarse primary carbide exists, and the hardness and the toughness of the quenched and tempered carbide are high and better. The 6Cr13 hot rolled steel strip is annealed, pickled, and then subjected to cold rolling and annealing for multiple times, the thickness of a finished product reaches about 0.1mm, and the method is mainly used for manufacturing industries such as razor blades, special blades and the like.
6Cr13 has high carbon content and high material hardness, so that the brittleness of the material is higher compared with other stainless steels, when the stainless steel coil is pickled on a long-line unit, the front and rear steel coils need to be welded to realize continuous production, but the weldability of 6Cr13 is poor, a heat affected zone is a hard and brittle martensite structure, when a welded joint passes through a hot rolling pickling production line, the welded joint needs to be repeatedly bent for many times, and the joint has the risk of brittle fracture.
Based on poor weldability of 6Cr13, small steel mills at home and abroad adopt short and straight production lines to carry out acid pickling on 6Cr13, and a welding joint is basically not bent and has small tension in the production process and basically does not crack; when a large-scale steel mill produces 6Cr13, a novel production line adopts a high-cost and energy-concentrated welding mode such as laser welding for welding, and tempering treatment is carried out after welding, so that the brittleness of a welding seam is reduced, and continuous production is realized.
The conventional hot rolling pickling line welding mode mainly adopts MIG welding, and no special tempering equipment is used after welding, how to adopt MIG welding to weld 6Cr13 ensures that a welding joint is not broken in the production process on a large pickling continuous production line, and no application example is provided in China. When the 6Cr13 steel strip is welded by MIG welding, the weld heat affected zone is all hard and brittle martensite, a plurality of bending rollers such as tension rollers and guide rollers exist in a hot rolling pickling line, and when a welding joint passes through the bending rollers, the welding joint is bent repeatedly for a plurality of times, the weld joint is cracked at a high probability, so that a strip breakage accident occurs, a machine set needs to be stopped for treatment, and great influence is caused on production.
Therefore, how to ensure that the 6Cr13 hot rolled steel strip welding joint does not crack in the production process is a problem which needs to be solved urgently at present.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a welding method of a hot rolled steel strip in a continuous annealing pickling line.
Specifically, the invention is realized by the following technical scheme:
a welding method of a hot rolled steel strip in a continuous annealing and pickling production line comprises the following steps:
and 4, tempering the welding joint between the first hot-rolled steel strip and the second hot-rolled steel strip.
Optionally, before the material tail of the first hot-rolled steel strip is butted with the first end of the leading strip, cutting off a part of the material tail with a transverse scratch defect; before the stub bar of the second hot-rolled steel strip is butted with the second end of the leading strip, the part of the stub bar with the transverse scratch defect is cut off.
Optionally, the first hot rolled steel strip and the second hot rolled steel strip are each independently a hot rolled steel strip with a width of 900-1300mm, a thickness of 3.5-5.0mm and a mark of 6Cr 13.
Optionally, the leading belt is a stainless steel strip with a length of 4-6mm and a mark of 304; the width and the thickness of the first end of the leading belt are respectively matched with the width and the thickness of the first hot-rolled steel belt; the width and the thickness of the second end of the leading strip are respectively matched with the width and the thickness of the second hot rolled steel strip.
Optionally, the strap is a strip of stainless steel having a length x width x thickness of 15mm x 10mm x 2.5mm, grade 304.
Optionally, in step 1, the gap of the main weld is 1-1.5 mm; the welding speed of the MIG welding machine is 0.8-1.2m/min, the welding voltage is 29-31V, the welding wire adopts ER309L with the diameter of 1.2mm, and the wire feeding speed is 10-14 m/min.
Optionally, in step 2, the two overlapping strips are symmetrical along the center line of the width of the first hot-rolled steel strip; the distance between the overlap strip and the edge of the first hot rolled strip adjacent to the overlap strip is 150-250 mm.
Optionally, in step 2, the welding current of the manual arc welding is 330-380A, the welding rod is an A302Fe welding rod with the diameter of 4mm, and the welding direction is from the leading strip to the first hot rolled steel strip for welding.
Optionally, in step 4, the tempering treatment is performed in an annealing furnace, the furnace temperature is 650-.
Compared with the prior art, the welding method of the hot rolled steel strip on the continuous annealing and pickling production line has the advantages that the measures of designing the welding process, the lapping process and the welding joint tempering process of the 6Cr13 hot rolled steel coil, utilizing the online annealing furnace to realize the tempering of the welding joint and the like are adopted, the welding joint is not broken on the production line, and the 6Cr13 steel strip can smoothly complete pickling operation.
Specifically, the welding method of the hot rolled steel strip in the continuous annealing and pickling production line has at least the following beneficial effects:
(1) the difficult problem of poor weldability of the 6Cr13 hot-rolled coil is solved, the welding between steel coils is realized, and a welding joint can smoothly pass through the whole hot-rolled annealing pickling continuous production line, so that the surface pickling treatment of the 6Cr13 steel strip is completed.
(2) Under the condition of not modifying the existing continuous wire equipment, the performance of a 6Cr13 welding joint is improved by adopting MIG welding together with manual arc welding and an online annealing furnace, smooth wire passing is realized, and the modification cost of the equipment is saved.
(3) The lap welding method on the main welding line provided by the invention can be applied to other steel grades with poor weldability.
(4) The tempering process of the welding joint provided by the invention can obviously reduce the hardness of the welding joint and improve the toughness of the welding joint.
Drawings
FIG. 1 is a view showing a positional relationship among a first hot rolled steel strip, a second hot rolled steel strip and a leader in the welding method of the present invention;
FIG. 2 is a process flow diagram of the welding method of the present invention;
wherein a denotes a length direction, B denotes a width direction, 1 denotes a first hot rolled steel strip, 11 denotes a tail of the first hot rolled steel strip, 2 denotes a leader, 21 denotes a first end of the leader, 22 denotes a second end of the leader, 3 denotes a second hot rolled steel strip, 31 denotes a head of the second hot rolled steel strip, 41, 42 denotes a main bead, 5 denotes a center line of the width of the first hot rolled steel strip, and 61, 62, 63, 64 denotes a lap strip.
Detailed Description
The invention will be described in detail with reference to the following detailed description for fully understanding the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below.
In the present invention, "steel strip", "steel coil", "hot rolled steel strip", "hot rolled steel coil", "hot rolled coil" and the like have the same meaning and may be used interchangeably.
In the invention, the continuous annealing and pickling production line is a conventional stainless steel hot rolling and annealing pickling line and is provided with equipment such as an uncoiler, a MIG welding machine, an inlet loop, an annealing furnace, a shot blasting machine, a scale breaker, a pickling tank, an outlet loop, a coiler and the like, and the hot rolled stainless steel strip can be annealed and pickled in the unit.
Aiming at the problem that a welded joint of 6Cr13 hot rolled steel strip is easy to crack in the production process, the inventor of the invention finds out through research that: the weldability of the 6Cr13 hot-rolled steel strip is poor, when acid pickling is carried out on a continuous production line, the main welding line adopting MIG welding can not independently ensure the wire passing requirement, when 2-3 stainless steel sheets with better weldability are lapped on the main welding line by adopting manual electric arc welding, the main welding line is reinforced, and the lapping strip can share the load born by a part of welding line in the repeated bending process, so that the load born by the main welding line is reduced. On the other hand, after the 6Cr13 steel strip is welded by MIG welding, most of the heat affected zone is hard and brittle martensite structure, when the weld joint is subjected to proper post-weld heat treatment, the martensite structure of the heat affected zone can be reduced or eliminated, meanwhile, the welding residual stress is reduced, and the toughness of the weld joint is improved.
Based on the conception, the invention provides a welding method of a hot rolled steel strip in a continuous annealing and pickling production line, which comprises the following steps: step 1, butt-jointing a material tail of a first hot-rolled steel strip with a first end of a leading strip, and welding a main welding seam by adopting an MIG welding machine; step 2, vertically lapping the two lapping strips on the main welding seam, and welding by adopting manual arc welding, so that the material tail of the first hot-rolled steel strip is welded with the first end of the leading strip; step 3, butt-jointing the stub bar of the second hot-rolled steel strip with the second end of the leading belt, and welding the stub bar of the second hot-rolled steel strip and the second end of the leading belt together by adopting the methods in the step 1 and the step 2; and 4, tempering the welded joint between the first hot-rolled steel strip and the second hot-rolled steel strip.
In the present invention, MIG welding is a gas metal arc welding method using a solid wire, which is a metal inert gas welding method.
In the present invention, manual arc welding (abbreviated as "manual arc welding") is a method of welding by using a manually operated welding wire and a workpiece to be welded as two electrodes and melting metal by using arc heat between the welding wire and the workpiece.
Referring to fig. 2, a preferred embodiment of the welding method of the hot rolled strip in the continuous annealing pickling line according to the present invention will be described by taking as examples that the first hot rolled strip and the second hot rolled strip are hot rolled strips of 6Cr13, the leader is a strip of 304 stainless steel, and the lap-joint strip is a strip of 304 stainless steel, as follows:
the preparation method comprises the following steps:
the 6Cr13 steel coil head and tail may have transverse scratch defects (the scratch direction is vertical to the rolling direction), and through field verification, if the transverse scratch defects exist, the steel coil is very easy to break along the transverse scratch part when passing through a bending roller, so that the transverse scratch part of the tail of the previous 6Cr13 steel coil (namely, a first hot rolled steel strip) needs to be cut off completely at an uncoiler, the tail is moved to a welding machine to be welded after being cut off completely, the transverse scratch part of the head of the next 6Cr13 steel coil (namely, a second hot rolled steel strip) is cut off completely, and the head is stopped at the uncoiler firstly.
The 6Cr13 steel coils are not suitable for being directly welded, and a 304 leading belt is needed for transition, namely, the first end of the leading belt is welded with the tail of the previous 6Cr13 steel coil, and the second end of the leading belt is welded with the head of the next 6Cr13 steel coil.
The length of the 304 leading belt can be 4-6m, the width and the thickness of the first end of the leading belt are respectively matched with the width and the thickness of the previous 6Cr13 steel coil, and the width and the thickness of the second end of the leading belt are respectively matched with the width and the thickness of the next 6Cr13 steel coil. Since the width and thickness of two adjacent front and back 6Cr13 steel coils are generally the same during the welding process of the 6Cr13 steel coil, a 304 stainless steel strip with the length of 4-6m and the width and thickness respectively the same as or similar to (plus or minus 1mm) to be welded with the 6Cr13 steel coil can be used as the leading strip.
It should be noted that, in the present invention, the length, width and thickness of the leader correspond to the length, width and thickness direction of the steel coil, for example, as shown in fig. 1.
Step 1:
and hoisting the 304 leading belt prepared in advance to a platform in front of a welding machine of a production line through a crown block, and ensuring the central line of the 304 leading belt to be consistent with the central line of the 6Cr13 steel coil on the production line by adopting a centering mechanism on the production line to prepare for welding.
The tail of the previous 6Cr13 steel coil is butted with the first end of the 304 leading strip, a MIG welding machine on a production line is adopted to weld a main welding line, wherein the gap of the welding line is 1-1.5mm, the welding speed is 0.8-1.2m/min, the welding voltage is 29-31V, the welding wire is ER309L welding wire with the diameter of 1.2mm, and the wire feeding speed is 10-14 m/min.
Step 2:
the welded steel band is reversed to a platform before a welding machine, a main welding seam is overlapped with a 304 stainless steel bar (an overlapping strip) by manual electric arc welding, and the overlapping welding process needs to be strictly controlled through field verification, otherwise, the load sharing effect cannot be achieved, and the quality of the welding seam can be deteriorated.
The lap welding process mainly comprises the following steps: (1) the material of the lapping strips is 304 annealed stainless steel with better weldability; (2) when the thickness of the lap joint is too small, the bearable load of the lap joint is reduced, meanwhile, the weld joint is poor in forming, when the thickness of the lap joint steel is too large, the bending radius is increased when the lap joint steel passes through a bending roll, the load born by the joint is increased, the probability of joint cracking is increased, and through field verification, the thickness of the lap joint steel is optimally 2.5mm, and the specification is 15 multiplied by 10mm (length multiplied by width); (3) two lap strips are lapped on the main welding line, the lap strips are symmetrically lapped on the main welding line, and the distance between the lap strips and the adjacent edge part is 150-250 mm; (4) only longitudinal welding seams (namely, welding seams along the length direction) can be welded during lap joint, and transverse welding seams are not welded; (5) during welding, heat input is reduced as much as possible on the basis of through welding, the welding current of the lap joint strip is 330-380A, and an A302Fe welding rod with the diameter of 4mm is adopted as the welding rod; (6) when the arc welding is adopted, a certain time is generally needed to stabilize the arc after the arc striking, which is equivalent to increasing the heat input, so in order to reduce the welding heat input of the 6Cr13 steel coil, the arc striking is carried out at the side of 304 initiating strip, the arc extinguishing is carried out at the side of 6Cr13 steel coil, and the welding direction is uniformly from 304 to 6Cr13 side.
And 3, step 3:
and (3) butting the stub bar of the latter 6Cr13 steel coil with the second end of the 304 leading strip, and welding by adopting the methods of the step 1 and the step 2. And after the two 6Cr13 steel coils are welded, the production line is started.
And 4, step 4:
when the normal hot rolling annealing pickling line produces martensite hot rolling stainless steel bands of other brands, because the steel coil is annealed in the bell type furnace, all the annealing furnaces on line are closed, and the steel bands are only pickled. When 6Cr13 steel strip is produced, the annealing furnace is heated to a certain temperature for heat preservation, and the welded joint is tempered to eliminate the martensite structure. Through laboratory and field operation verification, after the welding joint of the 6Cr13 steel coil is subjected to heat preservation at the temperature of 650-750 ℃ for 5min, the hardness HV of a heat affected zone can be reduced from 550 to 250, and the brittleness of the joint is obviously reduced. Therefore, the furnace temperature is set to 650-750 ℃, the heat preservation time in the furnace is more than 5min, the length of an annealing furnace of the field production line is 36m, the conversion rate is less than or equal to 7.2m/min, and the production speed is set to 5m/min by combining the pickling process.
In the invention, the 6Cr13 steel strip is transited through a 304 leading strip during welding, MIG welding is firstly adopted for welding, then two 304 steel strips are lapped, and the joint is reinforced, thereby improving the strength of the welded joint.
In the invention, the online annealing furnace is utilized, so that the welding joint can be simultaneously tempered in the steel strip pickling process, the toughness of the welding joint is improved, and the welding joint is ensured not to crack.
The method of the invention can lead the welded joint to smoothly pass through the whole hot rolling annealing pickling continuous production line, thereby completing the surface pickling treatment of the 6Cr13 steel strip.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1:
two annealed 6Cr13 hot-rolled steel coils are used as raw materials, the two coils are same furnace steel, and the chemical components of the two coils are as follows by mass percent: c: 0.6809%, Si: 0.4830%, Mn: 0.6645%, P: 0.0136%, S: 0.0017%, Cr: 13.8263%, Ni: 0.2722%, V: 0.1222%, N: 0.0062%, and the balance of Fe and other inevitable impurities, wherein the specification of the former roll is as follows: thickness 4.0mm, width 1263mm, length 467m, the specification of the latter book is: thickness 4.0mm, width 1262mm, length 482 m.
The welding method of the 6Cr13 hot rolled steel strip in the continuous annealing pickling line of the embodiment is as follows:
(1) the method comprises the steps of cutting off the transverse scratch part of the tail of the previous 6Cr13 steel coil at an uncoiler, moving the tail to a welding machine after cutting the tail completely, welding the tail, cutting off the transverse scratch part of the stub of the next 6Cr13 steel coil, and stopping the stub at the uncoiler.
(2) A304 leading belt with the length of 6m, the thickness of 4.0mm and the width of 1260mm is hung to an on-line platform in front of a welding machine through an overhead traveling crane, and a centering mechanism on a production line is adopted to ensure that the 304 leading belt is consistent with the center line of an on-line 6Cr13 steel coil.
(3) The method comprises the steps of firstly, butting the tail of the previous 6Cr13 steel coil with the first end of a 304 leading belt, and then welding a main welding seam by using an MIG welding machine on a wire, wherein the gap of the welding seam is 1mm, the welding speed is 0.9m/min, the welding voltage is 30V, the welding wire adopts ER309L with the diameter of 1.2mm, and the wire feeding speed is 12 m/min.
(4) The welded steel strip is reversed to a platform in front of a welding machine, two 304 stainless steel strips are lapped on a main welding line by manual arc welding, the specification of the lapping strip is 2.5 multiplied by 10 multiplied by 15mm of the 304 annealed stainless steel plate, the lapping strip is symmetrically lapped on the main welding line, and the distance from the lapping strip to the edge part is 160mm respectively; the lap welding uses an A302Fe welding rod with the diameter of 4mm, the welding current is 350A, only the longitudinal welding seam (parallel to the rolling direction) of the welding seam can be welded, and the welding direction is uniformly from the side of the 304 direction to the side of 6Cr 13.
(5) And (4) similarly welding the stub bar of the next roll of 6Cr13 with the second end of the 304 leading strip by adopting the methods (3) and (4), and starting the production line after the welding of the two welding seams is finished.
(6) And setting the furnace temperature of an annealing furnace on the production line to 700 ℃ to temper the welded joint, wherein the production speed is set to be 5 m/min.
The 6Cr13 steel coil and the welded joint obtained by the embodiment can smoothly pass through a whole hot rolling annealing pickling continuous production line, so that the surface pickling treatment of the 6Cr13 steel coil is completed, wherein the welded joint needs to be subjected to surface bending or back bending by at least 50 bending rollers on the production line, the tension of the whole line is 20-60KN, and the welded joint is not cracked.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, alterations, simplifications, etc. which do not depart from the spirit and principle of the present invention should be construed as being equivalents thereof and are intended to be included in the scope of the present invention.
Claims (9)
1. A welding method of a hot rolled steel strip in a continuous annealing and pickling production line is characterized by comprising the following steps:
step 1, butt-jointing a material tail of a first hot-rolled steel strip with a first end of a leading strip, and welding a main welding seam by adopting an MIG welding machine;
step 2, vertically lapping the two lapping strips on the main welding seam, and welding by adopting manual electric arc welding, so that the material tail of the first hot-rolled steel strip is welded with the first end of the leading strip;
step 3, butt-jointing the stub bar of the second hot-rolled steel strip with the second end of the leading belt, and welding the stub bar of the second hot-rolled steel strip and the second end of the leading belt together by adopting the methods in the step 1 and the step 2;
and 4, tempering the welded joint between the first hot-rolled steel strip and the second hot-rolled steel strip.
2. The method for welding the hot rolled steel strip on the continuous annealing and pickling line according to claim 1, wherein before the butt joint of the tail of the first hot rolled steel strip and the first end of the leader, a part of the tail with transverse scratch defects is cut off; before the stub bar of the second hot-rolled steel strip is butted with the second end of the leading strip, the part of the stub bar with the transverse scratch defect is cut off.
3. The welding method of the hot rolled steel strip in the continuous annealing and pickling line as claimed in claim 1, wherein the first hot rolled steel strip and the second hot rolled steel strip are each independently a hot rolled steel strip with a width of 900-1300mm, a thickness of 3.5-5.0mm and a mark of 6Cr 13.
4. A welding method for a hot rolled steel strip in a continuous annealing and pickling line according to claim 1, wherein the leader is a stainless steel strip having a length of 4-6mm and a mark number of 304; the width and the thickness of the first end of the leading belt are respectively matched with the width and the thickness of the first hot-rolled steel strip; the width and the thickness of the second end of the leading strip are respectively matched with the width and the thickness of the second hot rolled steel strip.
5. The method for welding a hot rolled steel strip in a continuous annealing and pickling line according to claim 1, wherein the strap is a stainless steel strip having a length x width x thickness of 15mm x 10mm x 2.5mm and a grade of 304.
6. The welding method of a hot rolled steel strip in a continuous annealing pickling line according to claim 1, wherein in step 1, the gap of the main weld is 1 to 1.5 mm; the welding speed of the MIG welding machine is 0.8-1.2m/min, the welding voltage is 29-31V, the welding wire adopts ER309L with the diameter of 1.2mm, and the wire feeding speed is 10-14 m/min.
7. The welding method of the hot rolled steel strip in the continuous annealing pickling line according to claim 1, wherein in the step 2, the two strips are symmetrical along a center line of the width of the first hot rolled steel strip; the distance between the overlap strip and the edge of the first hot rolled strip adjacent to the overlap strip is 150-250 mm.
8. The method for welding the hot rolled steel strip in the continuous annealing and pickling line as claimed in claim 1, wherein in the step 2, the welding current of the manual arc welding is 330-380A, the welding rod is an A302Fe welding rod with the diameter of 4mm, and the welding direction is from the leading strip to the first hot rolled steel strip.
9. The method for welding a hot-rolled steel strip on a continuous annealing and pickling line as set forth in claim 1, wherein the tempering treatment is performed in an annealing furnace at a furnace temperature of 650-.
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