CN114054906B - Combined welding method of ultrahigh-strength steel - Google Patents
Combined welding method of ultrahigh-strength steel Download PDFInfo
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- CN114054906B CN114054906B CN202111568240.8A CN202111568240A CN114054906B CN 114054906 B CN114054906 B CN 114054906B CN 202111568240 A CN202111568240 A CN 202111568240A CN 114054906 B CN114054906 B CN 114054906B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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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
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Abstract
The invention discloses a combined welding method of ultrahigh-strength steel, which comprises the following steps: welding 3-4 layers of the overhead welding surface of the ultrahigh-strength steel groove; welding 2-3 layers of flat welding surfaces of the ultrahigh-strength steel grooves; welding the upward welding surface to be flush with the base metal; filling and cover surface welding are completed on the flat welding surface; finishing cover surface welding on the overhead welding surface; and TIG welding is adopted for the upward welding surfaces, and manual arc welding is adopted for the downward welding surfaces. The application provides a combined welding method of ultrahigh-strength steel, solves the technical problem that the appearance and the internal quality of a welding seam cannot meet the requirements in the prior art, and improves the quality of the inside and the appearance of the welding seam.
Description
Technical Field
The invention relates to the technical field of ship welding, in particular to a combined welding method of ultrahigh-strength steel.
Background
With the development of the manufacturing industry of naval equipment in China, ultrahigh-strength steel is more and more widely applied to the manufacturing of naval equipment, has the characteristics of high strength, good plastic toughness, strong corrosion resistance and the like, and is mainly used for building special structures or parts.
However, due to the special construction characteristics, when welding, the welding is carried out at the upward position, and the welding is carried out at the horizontal position, at present, when welding is carried out at the upward position by adopting the manual arc welding of the welding rod, the appearance and the internal quality of the welding seam can not meet the requirements, so that how to solve the problems becomes the technical problem to be solved.
Disclosure of Invention
The embodiment of the application provides a combined welding method for ultrahigh-strength steel, solves the technical problem that the appearance and the internal quality of a welding seam cannot meet the requirements in the prior art, beautifies the appearance of the welding seam, and improves the quality of the welding seam.
The embodiment of the application provides a combined welding method of ultrahigh-strength steel, which comprises the following steps:
welding 3-4 layers of the overhead welding surface of the ultrahigh-strength steel groove;
welding 2-3 layers of flat welding surfaces of the ultrahigh-strength steel grooves;
welding the upward welding surface to be flush with the base metal;
filling and cover surface welding are completed on the flat welding surface;
finishing cover surface welding on the overhead welding surface;
and the upward welding surfaces adopt TIG welding, and the flat welding surfaces adopt manual arc welding.
Furthermore, be the flat face of welding between the first domatic and the second domatic of groove, be between third domatic and the fourth domatic face of welding of facing upward, face of welding of facing upward with the flat face of welding sets up to the side.
Further, when the ultrahigh-strength steel is welded, 3-4 layers of backing weld are firstly carried out on the upward welding surface by adopting a single-side welding and double-side forming welding method, the flat welding surface does not need to be subjected to back chipping, and the welding line formed on the back surface of the upward welding surface is polished smoothly by adopting a grinding wheel before welding and then is welded.
Further, when the overhead welding surface is welded, an HA557TIG welding wire is adopted for welding, the diameter of the welding wire is 3.2mm, the flow of protective gas is 15L/min-20L/min, and the parameters of backing welding are as follows: the current is 160-180A, the voltage is 11V-14V, and the welding speed is controlled to be 6 cm/min-9 cm/min; the filling cover surface parameters are as follows: the current is 180A-200A, the voltage is 11V-14V, and the welding speed is controlled at 8 cm/min-12 cm/min.
Further, when the flat welding surface is welded, an A577 welding rod is adopted for welding, the diameter of the welding rod is 4.0mm, the protection cover is adopted for introducing Ar gas for protection, the flow rate of the protection gas is controlled to be 6L/min-10L/min, and the welding parameters are as follows: the current is 130A-150A, the voltage is 24-28V, and the welding speed is controlled at 15 cm/min-25 cm/min.
Furthermore, the test plate is preheated before the ultrahigh-strength steel is welded, the preheating temperature is controlled to be 100-130 ℃, the inter-channel temperature is controlled to be 100-130 ℃ and the temperature of the cover surface layer is controlled to be less than or equal to 60 ℃ in the welding process.
And further, carrying out appearance inspection on the welded seam of the ultrahigh-strength steel, placing for 48h after the appearance inspection is qualified, and carrying out nondestructive inspection.
Furthermore, the groove is in an X shape, the upper half part of the groove is the flat welding surface, and the lower half part of the groove is the upward welding surface.
Further, the groove angle is controlled to be 60 degrees +/-1, no truncated edge is left, and the assembly gap of the welding seam is controlled to be 5mm.
Further, the ultrahigh-strength steel comprises the following chemical components in percentage by mass:
the physical and chemical performance requirements of the ultrahigh-strength steel are as follows:
one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the combined welding method for the ultrahigh-strength steel, the nondestructive testing radiographic result of the welded formed welding line meets the requirements of GB 3323I-level pieces, the mechanical properties of the welding line joint failure test meet the requirements of GJB4000-2000 standards, and the appearance and the internal quality of the welding line are guaranteed.
Drawings
Fig. 1 is a block flow diagram of a method for welding ultra-high strength steels in combination according to an embodiment of the present invention;
FIG. 2 is a dimension diagram of the groove of the ultra-high strength steel in the second embodiment of the present invention;
FIG. 3 is an assembly view of a weld of the groove of ultra-high strength steel in the second embodiment of the present invention.
Detailed Description
According to the combined welding method for the ultrahigh-strength steel, the special structure or part built by the ultrahigh-strength steel is welded by combining the manual electric arc welding mode and the TIG welding mode, so that the appearance and the internal quality of a welding seam are guaranteed, and the difficulty in engineering application is solved.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
As shown in fig. 1, a combined welding method for ultra-high strength steel according to an embodiment of the present invention includes:
step S1: welding 3-4 layers of the overhead welding surface of the ultrahigh-strength steel groove;
step S2: welding 2-3 layers of flat welding surfaces of the grooves of the ultrahigh-strength steel;
and step S3: welding the overhead welding surface to be flush with the base metal;
and step S4: filling and cover surface welding are completed on the flat welding surface;
step S5: because TIG welding electric arc heat is concentrated, the welding seam is heated by an annealing welding bead which is perfect at one time, and the annealing welding bead is arranged to complete cover welding on the overhead welding surface;
step S6: and (4) carrying out appearance inspection on the welded seam of the ultra-high strength steel, and after the appearance inspection is qualified, placing for 48h and then carrying out nondestructive inspection.
Wherein, TIG welding is adopted for the overhead welding surface, and manual arc welding is adopted for the flat welding surface. The groove is arranged in an X shape, a flat welding surface is arranged between the first slope surface and the second slope surface of the upper half part of the groove, and an upward welding surface is arranged between the third slope surface and the fourth slope surface of the lower half part of the groove. The upward welding surface and the flat welding surface are oppositely arranged.
The welding parameters are important basis for determining the welding process and the welding quality, and the success or failure of any welding method and welding process is determined by a welding process evaluation test, and the welding parameters comprise: the diameter of a welding wire (welding rod), the flow of protective gas, the welding current, the arc voltage, the welding speed, the arc length, the groove form and the like are considered simultaneously during welding, and the improper selection of any one parameter can have great influence on the welding quality and is not acceptable. Therefore, the present application specifically controls the welding of the ultra-high strength steel as follows.
When the welding surface is welded, an HA557TIG welding wire is adopted for welding, the diameter of the welding wire is 3.2mm, the flow of protective gas is 15L/min-20L/min, and the backing welding parameters are as follows: the current is 160-180A, the voltage is 11V-14V, and the welding speed is controlled to be 6 cm/min-9 cm/min; the filling cap parameters are: the current is 180A-200A, the voltage is 11V-14V, and the welding speed is controlled at 8 cm/min-12 cm/min.
When the flat welding surface is welded, adopting A577 welding rod manual electric arc welding, wherein the diameter of the welding rod is 4.0mm, adopting a protective cover to be electrified with Ar gas for protection, controlling the flow of the protective gas at 6L/min-10L/min, and the welding parameters are as follows: the current is 130A-150A, the voltage is 24V-28V, and the welding speed is controlled at 15 cm/min-25 cm/min.
The preheating before welding and the temperature control between the welding lines are used for reducing the cooling speed of a welding joint, are beneficial to the escape of diffused hydrogen in welding line metal, reduce welding stress, reduce the hardening tendency and avoid cold cracks, and are particularly important for welding the ultrahigh-strength steel. Therefore, in the embodiment, the test plate is preheated before the ultrahigh-strength steel is welded, the preheating temperature is controlled to be 100-130 ℃, the inter-road temperature is controlled to be 100-130 ℃ and the temperature of the cover surface layer is controlled to be less than or equal to 60 ℃ in the welding process.
Example two
The difference between the present embodiment and the first embodiment is that the ultra-high strength tempering components and the physical and chemical performance requirements in the present embodiment are shown in table 1 and table 2, respectively.
Table 1 chemical composition mass fraction%
TABLE 2 physical and chemical Property requirements
The ultrahigh-strength steel is novel special steel, the physical and chemical performance requirement is high, the welding difficulty is large, the application is special, the selection face of welding materials is narrow, the welding materials matched at present are newly researched and developed A557 welding rods and welding wires, and the phenomenon that the gas generated in a molten pool escapes badly when the A557 welding rods are welded in a lying position in an experimental process, so that a large number of air holes are generated in welding seams, and the welding quality is seriously influenced. In order to ensure the welding quality, an A557 welding wire is adopted to carry out a TIG welding up-welding position test, an A557 welding rod is adopted to carry out a manual arc welding down-welding position test, and the welding quality reaches the technical specification requirement after the welding is detected. Therefore, the embodiment of the present application adjusts the welding method as follows.
As shown in figure 2, in order to ensure that the welding can be conducted thoroughly, the welding slag among welding layers can be conveniently cleaned, the welding quantity of the front and the back of a welding seam is uniformly heated, the welding stress is uniformly distributed, the welding deformation is reduced, the processing is convenient, and the requirement of large production is met, the groove of the ultrahigh-strength steel is arranged in an X shape, a flat welding surface 2-3 is arranged between the first slope surface 2-1 and the second slope surface 2-2 of the upper half part of the groove, and an upward welding surface 2-6 is arranged between the third slope surface 2-4 and the fourth slope surface 2-5 of the lower half part of the groove. The thickness H of the ultrahigh-strength steel is 24mm, the heights H of the elevation welding surfaces 2-6 and the flat welding surfaces 2-3 are both 12mm, the angle alpha of the groove is controlled to be 60 degrees +/-1, and no truncated edge is left. In order to ensure that the root of the welding line can be welded through and meet the requirement of single-side welding and double-side forming, the assembly gap L of the welding line is controlled to be 5mm.
In the embodiment, the groove angle is controlled to be 60.2 degrees, no truncated edge is left, and the assembly gap of the welding line is controlled to be 5mm.
As shown in figure 3, when the ultrahigh-strength steel is welded, 4 layers of backing welds (1-6) are firstly carried out on the upward welding surfaces 2-6, the flat welding surfaces 2-3 do not need to be back gouged, the welding seams formed on the upward welding back surfaces are ground into U shapes by using a grinding wheel before welding and then welded for 3 layers (21-24), carbon arc gouging back gouging is not adopted, the heating times of the base metal are reduced, the appearance of hardening structures on the surfaces of welding grooves after carbon arc gouging is avoided, and the probability of welding cold cracks is reduced. Welding the welding surface to be level with the base metal (7-9); then, the flat welding surfaces 2-3 are filled and covered with surface welding (25-27); finally, the welding surface 2-6 is turned upward to complete the cover surface welding (10-11). When the welding is finished, the width A of the welding seam is controlled to be 16-20mm, and the height B of the welding seam super base material is controlled to be 1-4mm.
When welding is carried out on the upward welding surface of 2-6, an HA557TIG welding wire is adopted for welding, the diameter of the welding wire is 3.2mm, the flow of protective gas is 15L/min-20L/min, and the backing welding parameters are as follows: the current is 160A-170A, the voltage is 12V-14V, and the welding speed is controlled to be 6 cm/min-7 cm/min; the filling cap parameters are: the current is 180A-190A, the voltage is 12V-14V, and the welding speed is controlled at 8 cm/min-10 cm/min.
When the flat welding surface 2-3 is welded, adopting A577 welding rod manual electric arc welding, wherein the diameter of the welding rod is 4.0mm, adopting a protective cover to introduce Ar gas for protection, controlling the flow of the protective gas at 8L/min-10L/min, and the welding parameters are as follows: the current is 140A-150A, the voltage is 24V-28V, and the welding speed is controlled at 15 cm/min-20 cm/min.
The test plate is preheated before the ultrahigh-strength steel is welded, the preheating temperature is controlled to be 100-120 ℃, the inter-road temperature is controlled to be 100-120 ℃ and the temperature of the cover surface layer is controlled to be less than or equal to 60 ℃ in the welding process.
According to the combined welding method of the ultrahigh-strength steel, the nondestructive testing radiographic result of the welded formed welding line meets the requirements of GB 3323I-level sheets, the mechanical properties of the joint failure test of the welding line meet the requirements of GJB4000-2000 standards, and the appearance and the internal quality of the welding line are guaranteed.
The appearance of the welding seam welded by the welding method is attractive in appearance, the dimension of the welding seam is visually checked to be qualified, no surface defect exists, the welding seam is subjected to magnetic particle inspection (PT) flaw detection and Ultrasonic (UT) flaw detection, the X-Ray (RT) flaw detection is completely qualified, and the appearance and the internal quality of the welding seam are guaranteed.
Through destructive tests such as stretching, bending, impact and the like, all mechanical properties of the weld joint are higher than the physical and chemical property parameters in the table 2, and the requirements of GJB4000-2000 standards are met.
Otherwise exactly as in the first embodiment.
EXAMPLE III
The difference between the present embodiment and the second embodiment is that the bevel angle is controlled to be 60.5 °, no blunt edge is left, and the weld assembly gap is controlled to be 5mm.
When the ultrahigh-strength steel is welded, firstly welding 4 layers of overhead welding surfaces; then 3 layers of welding are carried out on the flat welding surface; welding the welding surface to be flush with the base metal; then, filling and cover surface welding are completed on the flat welding surface; and finally, finishing cover surface welding on the overhead welding surface.
When welding is carried out on the upward welding surface, an HA557TIG welding wire is adopted for welding, the diameter of the welding wire is 3.2mm, the flow of protective gas is 15L/min-18L/min, and the backing welding parameters are as follows: the current is 160A-175A, the voltage is 11V-13V, and the welding speed is controlled to be 6 cm/min-8 cm/min; the filling cover surface parameters are as follows: the current is 180A-195A, the voltage is 11V-13V, and the welding speed is controlled at 9 cm/min-11 cm/min.
When the flat welding surface is welded, adopting A577 welding rod manual electric arc welding, wherein the diameter of the welding rod is 4.0mm, adopting a protective cover to be communicated with Ar gas for protection, controlling the flow of the protective gas at 8-9L/min, and the welding parameters are as follows: the current is 130A to 145A, the voltage is 24V to 27V, and the welding speed is controlled to be 15cm/min to 22cm/min.
The test plate is preheated before the ultrahigh-strength steel is welded, the preheating temperature is controlled to be 100-125 ℃, the inter-road temperature is controlled to be 100-125 ℃ and the temperature of the cover surface layer is controlled to be less than or equal to 58 ℃ in the welding process.
According to the combined welding method of the ultrahigh-strength steel, the nondestructive testing radiographic result of the welded formed welding line meets the requirements of GB 3323I-level sheets, the mechanical properties of the joint failure test of the welding line meet the requirements of GJB4000-2000 standards, and the appearance and the internal quality of the welding line are guaranteed.
The welded seam formed by the welding method is attractive in appearance, the dimension of the welded seam is qualified through visual inspection, no surface defect exists, the welded seam is subjected to magnetic powder inspection (PT) flaw detection, ultrasonic wave (UT) flaw detection and X-Ray (RT) flaw detection, and the appearance and the internal quality of the welded seam are guaranteed.
Through destructive tests such as stretching, bending, impacting and the like, the mechanical properties of the weld joint are higher than those of the physicochemical property parameters in the table 2, and the requirements of the GJB4000-2000 standard are met.
Otherwise, the method is completely consistent with the second embodiment.
Example four
The difference between the second embodiment and the first embodiment is that the bevel angle is controlled at 59.5 °, no truncated edge is left, and the weld assembly gap is controlled at 5mm.
When the ultrahigh-strength steel is welded, firstly welding 3 layers of overhead welding surfaces; then 2 layers of welding are carried out on the flat welding surface; welding the welding surface to be flush with the base metal; then, the flat welding surface is filled and covered with welding; and finally, finishing cover surface welding on the overhead welding surface.
When welding is carried out on the upward welding surface, an HA557TIG welding wire is adopted for welding, the diameter of the welding wire is 3.2mm, the flow of protective gas is 15L/min-19L/min, and the backing welding parameters are as follows: the current is 165A-180A, the voltage is 11V-13V, and the welding speed is controlled to be 7 cm/min-9 cm/min; the filling cover surface parameters are as follows: the current is 185-200A, the voltage is 11-13V, and the welding speed is controlled at 9-12 cm/min.
When the flat welding surface is welded, adopting A577 welding rod manual electric arc welding, wherein the diameter of the welding rod is 4.0mm, adopting a protective cover to be aerated with Ar gas for protection, controlling the flow of the protective gas at 9L/min-10L/min, and the welding parameters are as follows: the current is 135A-150A, the voltage is 24V-26V, and the welding speed is controlled at 16 cm/min-19 cm/min.
The test plate is preheated before the ultrahigh-strength steel is welded, the preheating temperature is controlled to be 105-120 ℃, the inter-road temperature is controlled to be 105-120 ℃ and the temperature of the cover surface layer is controlled to be less than or equal to 56 ℃ in the welding process.
According to the combined welding method for the ultrahigh-strength steel, the nondestructive testing radiographic result of the welded formed welding line meets the requirements of GB 3323I-level pieces, the mechanical properties of the welding line joint failure test meet the requirements of GJB4000-2000 standards, and the appearance and the internal quality of the welding line are guaranteed.
The welded seam formed by the welding method is attractive in appearance, the dimension of the welded seam is qualified through visual inspection, no surface defect exists, the welded seam is subjected to magnetic powder inspection (PT) flaw detection, ultrasonic wave (UT) flaw detection and X-Ray (RT) flaw detection, and the appearance and the internal quality of the welded seam are guaranteed.
Through destructive tests such as stretching, bending, impact and the like, all mechanical properties of the weld joint are higher than the physical and chemical property parameters in the table 2, and the requirements of GJB4000-2000 standards are met.
Otherwise, the method is completely consistent with the second embodiment.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. the embodiment of the application utilizes the advantage that TIG welding easily two-sided shaping of single side welding to carry out TIG welding to super strength steel, and the molten bath receives argon protection during the welding, and isolated external gas invades, and the electric arc heat is concentrated, and the heat affected zone is narrow, and the molten bath is easily observed, and the fusion condition and the thickness of every welding seam of control can be better, reduce the probability that welding defect produced.
2. This application guarantees through welding 3-4 layers to the face of welding of pitching earlier and to pitching the intensity of face of welding seam and can resist the stress that the superhigh strength steel produced because of welding shrinkage for welding deformation can not take place for the superhigh strength steel when the face of flat welding.
3. According to the embodiment of the application, after 3-4 layers of welding are carried out at the overhead welding position, the back weld seam formed by overhead welding and single-side welding is ground into a U shape by a grinding machine, and then an A557 welding rod is adopted to carry out bottom sealing welding on the flat welding surface. The gas generated in the molten pool is fully escaped when the flat welding adopts the A557 welding rod for welding, the gas hole is not easy to generate, the filling amount of the welding rod with phi 4mm is larger than that of an argon arc welding wire, the welding efficiency is favorably improved, the thickness of the welding seam of 2-3 layers to be welded is similar to that of the welding seam of the overhead welding surface, so that the welding stress on the front side and the back side of the welding seam is uniformly distributed, the workpiece is uniformly heated, and the deformation is small.
4. According to the method for alternately welding the overhead welding surface and the flat welding surface, the welding stress distribution of the front and back surfaces of the welding line is uniform, the ultra-high-strength steel is uniformly heated, and the deformation of the ultra-high-strength steel is well controlled.
5. According to the combined welding method of the ultrahigh-strength steel, the nondestructive testing radiographic result of the welded formed welding line meets the requirements of GB 3323I-level sheets, the mechanical properties of the joint failure test of the welding line meet the requirements of GJB4000-2000 standards, and the appearance and the internal quality of the welding line are guaranteed.
Finally, it should be noted that the above detailed description is only intended to illustrate the technical solutions of the present invention and not to limit the same, and that, although preferred embodiments of the present invention have been described, further variations and modifications of these embodiments are possible to those skilled in the art once they learn of the basic inventive concept. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A combined welding method of ultrahigh-strength steel is characterized by comprising the following steps:
welding 3-4 layers of the overhead welding surface of the ultrahigh-strength steel groove;
welding 2-3 layers of the flat welding surface of the ultrahigh-strength steel groove;
welding the upward welding surface to be flush with the base metal;
filling and cover surface welding are completed on the flat welding surface;
finishing cover surface welding on the overhead welding surface;
a flat welding surface is arranged between the first slope surface and the second slope surface of the groove, an upward welding surface is arranged between the third slope surface and the fourth slope surface, and the upward welding surface and the flat welding surface are oppositely arranged;
the upward welding surfaces are all welded by TIG, when the upward welding surfaces are welded, an HA557TIG welding wire is adopted for welding, the diameter of the welding wire is 3.2mm, the flow of protective gas is 15L/min-20L/min, and the backing welding parameters are as follows: the current is 160-180A, the voltage is 11V-14V, and the welding speed is controlled to be 6 cm/min-9 cm/min; the filling cover surface parameters are as follows: the current is 180A-200A, the voltage is 11V-14V, and the welding speed is controlled at 8 cm/min-12 cm/min;
the flat welding surface adopts manual electric arc welding, when the flat welding surface is welded, an A577 welding rod is adopted for welding, the diameter of the welding rod is 4.0mm, ar gas is introduced into a protection cover for protection, the flow of the protection gas is controlled at 6L/min-10L/min, and the welding parameters are as follows: the current is 130A to 150A, the voltage is 24V to 28V, and the welding speed is controlled to be 15cm/min to 25cm/min;
the ultrahigh-strength steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.11, si is less than or equal to 0.17 and less than or equal to 0.37, mn is less than or equal to 0.40 and less than or equal to 0.70, P is less than or equal to 0.015, S is less than or equal to 0.010, ni is less than or equal to 4.40 and less than or equal to 4.80, cr is less than or equal to 0.40 and less than or equal to 0.70, mo is less than or equal to 0.30 and less than or equal to 0.55, and V is less than or equal to 0.03 and less than or equal to 0.09;
the physical and chemical performance requirements of the ultrahigh-strength steel are as follows: the yield strength REL is more than or equal to 785N/mm < 2 >, the tensile strength Rm is more than or equal to 705N/mm < 2 >, the elongation A after fracture is more than or equal to 15.0%, the reduction of area Z is more than or equal to 50.0%, and the impact performance is as follows: the test temperature is-20 ℃, and the impact energy KV2 is more than or equal to 80J.
2. The method for the combined welding of ultra-high strength steels according to claim 1, characterized in that:
when the ultrahigh-strength steel is welded, 3-4 layers of backing weld are firstly carried out on the upward welding surface by adopting a single-side welding and double-side forming welding method, the flat welding surface does not need to be subjected to back chipping, and a welding line formed on the back surface of the upward welding surface is polished smoothly by adopting a grinding wheel before welding and then is welded.
3. The method of combined welding of ultra high strength steels according to claim 1 or 2, characterized in that:
the test plate is preheated before the ultrahigh-strength steel is welded, the preheating temperature is controlled to be 100-130 ℃, the inter-road temperature is controlled to be 100-130 ℃ and the temperature of the cover surface layer is controlled to be less than or equal to 60 ℃ in the welding process.
4. The method for the combined welding of ultra-high strength steels according to claim 3, characterized in that:
and (4) carrying out appearance inspection on the welded seam of the ultrahigh-strength steel, and after the appearance inspection is qualified, placing for 48h and then carrying out nondestructive inspection detection.
5. The method for the combined welding of ultra-high strength steels according to claim 4, characterized in that:
the groove is X-shaped, the upper half part of the groove is the flat welding surface, and the lower half part of the groove is the overhead welding surface.
6. The method for the combined welding of ultra high strength steels according to claim 5, characterized in that:
the groove angle is controlled to be 60 degrees +/-1, no truncated edge is left, and the assembly gap of the welding seam is controlled to be 5mm.
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| CN102357741B (en) * | 2011-09-07 | 2015-03-11 | 无锡市创新化工设备有限公司 | Girth welding technology for vacuum container |
| JP5954009B2 (en) * | 2012-07-17 | 2016-07-20 | Ｊｆｅスチール株式会社 | Manufacturing method of welded steel pipe |
| CN103464865B (en) * | 2013-07-24 | 2015-10-28 | 武汉一冶钢结构有限责任公司 | The grade of P690QL1 high strength steel mates by force welding rod manual welding welding method |
| CN103659012B (en) * | 2013-11-29 | 2015-08-26 | 大连船舶重工集团有限公司 | A kind of large slab efficient combination welding technique |
| CN105252108B (en) * | 2015-10-27 | 2017-11-10 | 武昌船舶重工集团有限公司 | A kind of flat elevation angle of steel for ship structure connects welding method |
| CN106475666B (en) * | 2016-11-17 | 2019-03-26 | 中国华冶科工集团有限公司 | Pipeline narrow gap vertical downward TIG weld method |
| CN112719515A (en) * | 2021-01-25 | 2021-04-30 | 武汉锅炉股份有限公司 | Rail TIG welding method for black and white pipe |
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2021
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