CN116689921A - Martensitic stainless steel coil auxiliary welding method - Google Patents
Martensitic stainless steel coil auxiliary welding method Download PDFInfo
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- CN116689921A CN116689921A CN202310527015.2A CN202310527015A CN116689921A CN 116689921 A CN116689921 A CN 116689921A CN 202310527015 A CN202310527015 A CN 202310527015A CN 116689921 A CN116689921 A CN 116689921A
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- stainless steel
- welding
- welded
- martensitic stainless
- steel coil
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- 238000003466 welding Methods 0.000 title claims abstract description 135
- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 17
- 239000010935 stainless steel Substances 0.000 claims abstract description 17
- 239000010963 304 stainless steel Substances 0.000 claims description 7
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 24
- 238000005336 cracking Methods 0.000 abstract description 10
- 238000005452 bending Methods 0.000 abstract description 9
- 239000002253 acid Substances 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 229910000734 martensite Inorganic materials 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 238000005554 pickling Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- B23K9/32—Accessories
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses an auxiliary welding method of martensitic stainless steel coils, which comprises the following steps: and welding a plurality of bonding sheets on the welding seam welded by the martensitic stainless steel coil, wherein when the bonding sheets are welded on the stainless steel welding seam, the welded bonding sheets are perpendicular to the welding seam of the martensitic stainless steel coil, the two sides of the bonding sheets perpendicular to the welding seam are welded in a full-welded mode, and the two sides parallel to the welding seam are welded in a spot-welded mode. The bonding sheets used for preventing the welding lines from cracking and breaking are welded on the welding lines of the two adjacent martensitic stainless steel coils, so that the welded welding lines can bear the bending of the welding lines and the weight of 10 tons or more when the welded martensitic stainless steel strips are produced by a hot acid line, the problems of cracking and breaking cannot occur, the machine set production stop tape connection cannot be caused, the production continuity can be ensured, and the production, safety, quality and efficiency are guaranteed.
Description
Technical Field
The invention relates to the technical field of stainless steel coil welding, in particular to an auxiliary welding method for martensitic stainless steel coils.
Background
The martensitic stainless steel has high hardness and can be widely applied to industries such as cutters, medical appliances and the like. The martensitic hot rolled coil (also called black skin coil) is subjected to hot acid line to remove surface iron scales to obtain a steel coil (also called white skin coil) with a required surface state.
The martensitic stainless steel production process comprises smelting in a steel mill, continuously casting into a casting blank, rolling the casting blank into a steel coil with the thickness of 2.0-6.0 mm through hot rolling, annealing the steel coil through a hood-type annealing furnace after hot rolling, fully recrystallizing the material, and removing surface oxidized iron scales from the steel coil after hood-type annealing through a hot rolling pickling line (hereinafter called hot wire for short), blasting balls and pickling to obtain the steel coil with the required surface.
The hot acid line is a continuous production line, butt welding is carried out between each coil through a welding machine, the welding line passes through the line along with the steel coil, the unit is provided with a loop phosphorus breaking machine, a shot blasting machine, a pickling tank and a coiling machine, the welding line can be subjected to a plurality of bending and bear the tension of more than 10 tons, and therefore the quality of the welding line determines whether the martensitic unit can pass through the line continuously or not and directly influences the production efficiency. Because martensite is influenced by the characteristics of steel types, the welding performance is poor, and the fracture of a weld heat affected zone often occurs, so that the production of a unit is stopped to connect a belt, and the production, the quality and the safety are greatly influenced.
Disclosure of Invention
In order to solve part or all of the technical problems in the prior art, the invention provides an auxiliary welding method for martensitic stainless steel coils, which can weld martensitic stainless steel coils, and enable the welded martensitic stainless steel coils to be continuously produced, and the welded seam can not generate cracks and belt breakage in the production process, so that the welding effect is good, the production efficiency of the martensitic stainless steel coils is improved, and the production safety and the production quality are ensured.
The technical scheme of the invention is as follows:
an auxiliary welding method for martensitic stainless steel coils comprises the following steps:
and welding a plurality of bonding sheets on the welding seam welded by the martensitic stainless steel coil, wherein when the bonding sheets are welded on the stainless steel welding seam, the length direction of the welded bonding sheets is vertical to the welding seam direction of the martensitic stainless steel coil, the bonding sheets perpendicular to the welding seam are welded with the stainless steel coil in a full-welded mode, and the bonding sheets parallel to the welding seam are welded with the stainless steel coil in a spot-welded mode.
Further, when the bonding sheet is welded to the martensitic stainless steel coil, the welded bonding sheet is bent in the thickness direction at an angle of 160 DEG to 170 deg.
Further, the thickness of the strap is 2mm-3mm, and the width is 80 mm-140 mm.
Further, the strap is made of 304 stainless steel.
Further, the number of the bonding tabs is two, and the two bonding tabs are symmetrically arranged on two sides of a welding seam of the martensitic stainless steel coil.
Further, two of the overlapping pieces are welded to a position parallel to one side of the end of the martensitic stainless steel coil at a distance of 100mm to 200 mm.
Further, when the strap is welded, welding is performed by arc welding.
Further, when the arc welding is adopted for welding, the current parameter of the arc welding is 220A-260A.
Further, when the bonding sheet is welded on the martensitic stainless steel coil, the bonding sheet is positioned on the same side or two sides of the welding line of the stainless steel coil.
The technical scheme of the invention has the main advantages that:
according to the auxiliary welding method for the martensitic stainless steel coil, the bonding tabs for preventing the welding lines from cracking and breaking are welded on the welding lines of the two adjacent martensitic stainless steel coils, so that the welded welding lines can bear the bending of the welding lines and the weight of 10 tons or more when the martensitic stainless steel belt is produced by a hot acid line, the problems of cracking and breaking cannot occur, the machine set production stop tape connection cannot be caused, the production continuity can be ensured, and the production, safety, quality and efficiency are guaranteed.
Furthermore, according to the auxiliary welding method for the martensitic stainless steel coil, the welding strap is bent before welding, so that the welded strap can be in contact with the martensitic stainless steel strip more fully, the contact area is larger, the full welding area is larger, the welding effect is better, and the welding is firmer.
Furthermore, according to the auxiliary welding method for the martensitic stainless steel coil, the 304 stainless steel with the thickness of 2-3 mm and the width of 80-140 mm is adopted as the bonding sheet, so that the welding effect with the martensitic stainless steel coil is good during welding, the welded welding spot is firmer, and the welding quality is ensured.
Furthermore, according to the auxiliary welding method for the martensitic stainless steel coil, the bonding jumper is welded at the position parallel to one side of the end part of the martensitic stainless steel coil, wherein the distance is 100-200 mm, so that the bonding jumper has a more sufficient fixing effect when the hot acid line continuous production is carried out, the cracking of the welded bonding jumper caused by overlarge stress on two sides or in the middle is avoided, the surface of the martensitic stainless steel coil is damaged, the welding quality is ensured, and the welding reliability is improved.
Furthermore, according to the auxiliary welding method for the martensitic stainless steel coil, the strap and the martensitic stainless steel coil are welded in an arc welding mode, so that the operation is convenient, and the arc welding connection effect is better.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and without limitation to the invention. In the drawings:
FIG. 1 is a schematic diagram showing the distribution of bonding tabs on a stainless steel coil in an auxiliary welding method of a martensitic stainless steel coil;
fig. 2 is a schematic structural view of a martensitic stainless steel coil after bending the strap in the auxiliary welding method of the present invention;
reference numerals illustrate:
1. a martensitic stainless steel coil; 2. a strap; 3. welding seams; 4. full-welded strips; 5. and (5) spot welding the belt.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes in detail the technical scheme provided by the embodiment of the invention with reference to the accompanying drawings.
Specifically, martensitic stainless steel is a material for non-welded structures, which has poor weldability, and when in welding processing, the temperature of a welding area reaches over 1600 ℃, and the coarsening of grains in a welding weld line and a overheating area is serious; when the martensitic stainless steel coil 1 is manufactured and applied, two adjacent stainless steel sheets or thin plates are required to be welded (or the steel sheets of two martensitic stainless steel coils 1 are aligned and welded with the steel sheets of another martensitic stainless steel coil 1, and a plurality of martensitic stainless steel sheets are formed into one steel coil or a plurality of steel coils to form steel coils with different specifications in a welding mode); so that the martensitic stainless steel coil 1 is formed by a plurality of phase-welded stainless steel sheets after the procedures such as winding. Specifically, when the martensitic stainless steel coil 1 is welded, the argon arc welding mode is adopted, when the martensitic stainless steel coil 1 is welded by adopting the argon arc welding mode, 98% Ar gas is used for protection, 309L welding wires are used for welding, and then the welded martensitic stainless steel coil 1 is applied to the rest working procedures; taking a hot-rolling pickling production line as an example, the related process comprises the processing procedures of a loop phosphorus breaking machine, a shot blasting machine, a pickling tank, a coiling machine and the like.
Specifically, as the cooling speed after welding is high, a brittle and hard martensitic structure is formed by quenching, the plasticity is seriously reduced, the volume is expanded, and particularly when the situation is bad, stress cracks can be generated, and in the actual production and application process, the welded joint is overlapped by multiple factors such as repeated bending, overlapped tension and the like when passing through a roller way, so that the cracking tendency of the welded joint is increased. Even the welded joint which is broken most seriously causes the steel belt to be broken completely, and causes serious threat to normal production. In severe cases, the 40Cr13 weld in practical production breaks at the hot acid line, and in slightly better cases, such as the weld 3 can normally pass the line, but the weld 3 cracks, such as the weld 3 cracks after the 30Cr13 hot acid line is pickled.
Example 1
As shown in fig. 1-2, the embodiment of the invention provides an auxiliary welding method for martensitic stainless steel coil, which solves the problems of low efficiency and shutdown tape connection caused by unit production due to cracking and breaking of martensitic stainless steel coil 1, and comprises the following steps:
a plurality of bonding sheets 2 are welded on a welding line 3 welded on a martensitic stainless steel coil 1, when the bonding sheets 2 are welded on the stainless steel welding line 3, the length direction of the welded bonding sheets 2 is vertical to the direction of the welding line 3 on the martensitic stainless steel coil 1, and two sides of the bonding sheets 2 vertical to the welding line 3 are welded with the stainless steel coil 1 in a full-welding mode to form a strip-shaped full-welded strip 4; the welding is performed with the stainless steel coil 1 by spot welding on both sides of the strap 2 parallel to the weld 3 to form a spot welding strip 5 as shown in fig. 1.
Specifically, the full-welding mode is to weld all the sides of the strap 2, which are in contact with the martensitic stainless steel coil 1 in the length direction, so that the welded weld joint 3 is a complete connecting line; when the spot welding is performed at a position where the width direction of the strap 2 contacts with the martensitic stainless steel coil 1, a gap is present between the weld lines 3, and it should be noted that the spot welding region is any position in the width direction of the strap 2, including but not limited to, the middle position of the strap 2.
Specifically, when the strap 2 is welded to the martensitic stainless steel coil 1, the welded strap 2 is bent in the thickness direction at an angle of 160 ° to 170 °, as shown in fig. 2. Specifically, when the bent strap 2 is used, the bent side faces the martensitic stainless steel coil 1, as shown in fig. 2, and the martensitic stainless steel coil is attached to the side of the marked angle in fig. 2, so that the bent portion contacts the martensitic stainless steel coil 1, and the weld 3 of the martensitic stainless steel coil 1 is located in the lowest (high) plane of the arc structure formed by bending.
Specifically, the strap 2 is a metal sheet that can be welded to the martensitic stainless steel by welding and then welded.
Preferably, the thickness of the metal sheet is 2mm-3mm of the strap 2 and the width is 80 mm-140 mm.
Preferably, the strap 2 is made of 304 stainless steel.
By setting the strap 2 to be made of 304 stainless steel in this way, the 304 stainless steel has excellent weldability, high strength, and excellent shaping, and the use of 304 stainless steel as the strap 2 can satisfy repeated bending of the tension roller.
Preferably, the number of the bonding tabs 2 is two, and the two bonding tabs 2 are symmetrically arranged at two sides or two ends of the weld joint 3 of the martensitic stainless steel coil 1.
Specifically, the symmetry of the two overlapping pieces 2 symmetrically arranged on both sides of the weld 3 of the martensitic stainless steel coil 1 means that the overlapping pieces 2 perpendicular to the weld 3 are symmetrically distributed on both ends of the same side of the martensitic stainless steel coil 1 along the midpoint of the weld 3, as shown in fig. 1, and on the other hand, as a preferred mode, one overlapping piece 2 is symmetrically distributed on both sides of the weld 3, so that the tensile force born by the stainless steel coil is more uniform, the probability of cracking and breaking of the weld 3 is smaller, and the appearance is better.
Specifically, two overlapping pieces 2 are welded to a position (not shown in the figure) parallel to one side of the end of the martensitic stainless steel coil 1 at a distance of 100mm to 200 mm.
Preferably, when welding the strap 2, welding is performed by arc welding.
Preferably, when arc welding is used for welding, the current parameter of the arc welding is 220A-260A.
Specifically, the strap 2 is located on the same or both sides of the weld 3 on the martensitic stainless steel coil 1 when the strap 2 is welded to the martensitic stainless steel coil 1.
In some alternative implementations of the present embodiment, the bonding sheets 2 according to the present invention may be welded to both sides of the weld 3 on the martensitic stainless steel coil 1, i.e. both sides of the stainless steel coil, preferably by providing two bonding sheets 2 according to the above embodiment 1 on one side and one bonding sheet 2 in the middle of the other side.
In some alternative implementations of the present embodiment, the tabs 2 of the present invention may be welded to two sides or two ends (respectively on two sides, upper side and/or lower side of the martensitic stainless steel coil 1) of the weld 3 on the martensitic stainless steel coil 1, and the number and distribution of the tabs 2 welded to the two sides are symmetrical.
Example 2
304 sheets having a thickness of 3.0mm and a width of 100mm were used as the bonding sheets 2 by the method of example 1, the bonding sheets 2 were bent 165 ° from the center, and the martensitic stainless steel coil 1 was welded using an arc welding current 246A, the welding steps being:
(1) The material of the strap 2 is 304, the thickness is 3mm, the width is 100mm, and the length is 200mm-250mm before and after the strap 2 is used for repairing the martensitic argon arc welding seam 3.
(2) 304 the strap 2 is bent before use, the bending angle is 165 DEG, and a certain residual height is left on the welded seam 3 after welding by adopting argon arc welding filler wires, if the residual Gao Gaodu is 2mm-5mm, preferably 3mm; in order to make the bonding sheet 2 better adhere to the martensitic stainless steel coil 1 of the base material, a hammer or a weight is used for hammering the bonding sheet 2 during the welding process, so that the bonding of the bonding sheet 2 and the base material is more sufficient.
(3) The welding mode of the strap 2 adopts an arc welder, two sides are fully welded, and the end part is electrically welded.
Specifically, if the end portion of the strap 2 is fully welded, the strap 2 is repeatedly bent by the tension roller, and the base material at the welded portion of the end portion of the strap 2 is often broken, and the martensite itself is fragile, so that cracks propagate, and the strap is broken. When welding is performed, the arc welding parameter current is 246A (mahalanobis is relatively sensitive to welding heat input, so that the welding current is required to be constant, and when the 304 strap 2 is used for welding with the base material martensitic stainless steel coil 1, the current is selected to be most suitable for 220-260A welding effect according to data of actual welding verification.
(4) The overlapping strips 2 are welded by vertical welds 3, one on each side, 150mm at a time from the edges of the strip.
Specifically, in the practical application process, when the strip steel (martensitic stainless steel coil 1) passes through the wire, the phenomenon of left-right swing occurs through a tension roller, a deviation correcting roller and the like, the stress on two sides of a welding line 3 is maximum, the welding is also frequently started from two sides, the fixed position of the strap 2 is limited, the strap 2 is positioned 150mm away from the edge of the strip steel, the distance between the strap 2 and the strip steel is too close to the middle of the strip steel, the protection effect is not achieved, and when the strap 2 is too close to the two sides, the heat in-out of the arc welding affects the performance of the strip steel at the edge, and the effect is poor.
When the method of the embodiment 1 of the invention is adopted to weld the martensitic stainless steel coil 1 in the embodiment 2, about 10800 welding seams 3 on the martensitic stainless steel coil 1 are all safely passed, the stop belt connection problem caused by cracking and belt breakage on a production line is avoided, and the continuous production of the martensitic stainless steel coil 1 is realized.
Therefore, according to the auxiliary welding method for the martensitic stainless steel coil 1, the bonding tabs 2 for preventing the welding lines 3 from cracking and breaking are welded on the welding lines 3 of the two adjacent martensitic stainless steel coils 1, so that the welded welding lines 3 can bear the bending of the welding lines 3 and the weight of 10 tons or more and cannot crack or break when the martensitic stainless steel strip is subjected to hot acid line production, the machine set production stop tape connection cannot be caused, the production continuity can be ensured, and the production, safety, quality and efficiency are guaranteed.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In this context, "front", "rear", "left", "right", "upper" and "lower" are referred to with respect to the placement state shown in the drawings.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting thereof; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The auxiliary welding method for the martensitic stainless steel coil is characterized by comprising the following steps of:
and welding a plurality of bonding sheets on the welding seam welded by the martensitic stainless steel coil, wherein when the bonding sheets are welded on the stainless steel welding seam, the length direction of the welded bonding sheets is vertical to the welding seam direction of the martensitic stainless steel coil, the bonding sheets perpendicular to the welding seam are welded with the stainless steel coil in a full-welded mode, and the bonding sheets parallel to the welding seam are welded with the stainless steel coil in a spot-welded mode.
2. The auxiliary welding method of martensitic stainless steel coil according to claim 1, wherein when welding the bonding jumper to the martensitic stainless steel coil, the welded bonding jumper is bent in the thickness direction at an angle of 160 ° to 170 °.
3. The auxiliary welding method of martensitic stainless steel coils according to claim 1, wherein the thickness of the bonding sheet is 2mm-3mm and the width is 80 mm-140 mm.
4. The method of claim 1, wherein the strap is made of 304 stainless steel.
5. The auxiliary welding method of martensitic stainless steel coils according to claim 1, wherein the number of the bonding tabs is two, and the two bonding tabs are symmetrically arranged on two sides of a welding seam of the martensitic stainless steel coils.
6. The auxiliary welding method of martensitic stainless steel coil according to claim 5, wherein two of said overlapping pieces are welded at a position of 100mm-200mm distance from one side parallel to the end of the martensitic stainless steel coil.
7. The auxiliary welding method of martensitic stainless steel coil according to claim 1, wherein the welding is performed by arc welding when the bonding jumper is welded.
8. The method for auxiliary welding of martensitic stainless steel coil of strip of claim 7, wherein the arc welding has a current parameter of 220A-260A when the arc welding is used for welding.
9. The auxiliary welding method of martensitic stainless steel coil according to claim 1, wherein the bonding sheets are positioned on the same side or both sides of the weld of the martensitic stainless steel coil when the bonding sheets are welded on the martensitic stainless steel coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310527015.2A CN116689921A (en) | 2023-05-11 | 2023-05-11 | Martensitic stainless steel coil auxiliary welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310527015.2A CN116689921A (en) | 2023-05-11 | 2023-05-11 | Martensitic stainless steel coil auxiliary welding method |
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| Publication Number | Publication Date |
|---|---|
| CN116689921A true CN116689921A (en) | 2023-09-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310527015.2A Pending CN116689921A (en) | 2023-05-11 | 2023-05-11 | Martensitic stainless steel coil auxiliary welding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116689921A (en) |
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2023
- 2023-05-11 CN CN202310527015.2A patent/CN116689921A/en active Pending
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