CN104308335A - Gas metal arc welding method - Google Patents
Gas metal arc welding method Download PDFInfo
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- CN104308335A CN104308335A CN201410452385.5A CN201410452385A CN104308335A CN 104308335 A CN104308335 A CN 104308335A CN 201410452385 A CN201410452385 A CN 201410452385A CN 104308335 A CN104308335 A CN 104308335A
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- Prior art keywords
- welding
- gas metal
- arc welding
- gas
- arc
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Classifications
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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
-
- 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
- B23K9/235—Preliminary treatment
-
- 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
Abstract
The invention provides a gas metal arc welding (GMAW) method which solves the technical problems that the current manual arc welding is large in welding deformation, low in efficiency and high in cost. In the gas metal arc welding method, a welded component is preheated before welding at the preheating temperature of 100-150DEG C; the welded component adopts an X-shaped bevel form with the bevel angle of 55-65 degrees; in the welding process, heat input is not larger than 29KJ/CM. The gas metal arc welding method can be used for welding SA738GR.B steel material.
Description
Technical field
The present invention relates to a kind of welding method, especially relate to a kind of gas metal-arc welding welding method.
Background technology
In recent years, China's Construction of Nuclear Electricity enters high-speed development period, and a large amount of nuclear power projects enters setup state, and generation Ⅲ nuclear power heap-type is AP1000, CAP1000 and CAP1400.In generation Ⅲ nuclear power heap-type, the material of main part of containment is SA738GR.B steel plate.China is the country applying SA738GR.B steel plate first in nuclear power.For this low-alloy steel material, at present except manual electric arc welding can meet the requirement of its welding performance, there is no other suitable welding method can use.
Although manual electric arc welding can meet the welding performance requirement of above-mentioned Steel material, there is following problem:
One is that product is larger at welding process welding deformation because manual electric arc welding maximum heat input quantity can reach 40KJ/CM;
Two is steel containment vessel body thickness of slab 42.1 ~ 47.6mm, and weld seam total length is approximately 3400m, and a manual welding welder can only weld about 500mm every day, and efficiency is very low;
Three is the durations for ensureing Construction of Nuclear Electricity, and need to drop into a large amount of welders, according to the statistics in current project, the maximum input amount of single unit welder is 68, expends huge manpower, and cost is very high.
Summary of the invention
The present invention be directed to the technical problem that existing manual electric arc welding welding distortion is large, welding efficiency is low and cost is high, the gas metal-arc welding that a kind of welding deformation is little, welding efficiency is high and cost is low welding method is provided.
For this reason, the invention provides a kind of gas metal-arc welding welding method, it first carries out preheating to SA738GR.B Plate Welding part before welding, and preheat temperature is 100 ~ 150 DEG C; The groove type of weldment adopts X-type groove, and bevel angle is 55 ° ~ 65 °; The heat input used in welding process is no more than 29KJ/CM.
Preferably, selected during welding gas is Ar and CO
2.
Preferably, during welding, the flow of gas is 15 ~ 23l/min.
Preferably, selected during welding gas content is the Ar of the 80% and CO of 20%
2.
Preferably, be in welding process, between road, temperature is no more than 200 DEG C.
Preferably, welding position be in downhand welding, horizontal position welding, vertical position welding and overhead welding any one or its combination.
Preferably, in downhand position, before weldering, unfitness of butt joint is 0 ~ 3mm, and group is 0 ~ 5mm to root gap; In horizontal position, before weldering, unfitness of butt joint is 0 ~ 3mm, and group is 0 ~ 4mm to root gap; In vertical position of welding, before weldering, unfitness of butt joint is 0 ~ 5mm, and group is 0 ~ 5mm to root gap.
Preferably, welding adopts the combination of any one or both of manual semi-automatic welding, mechanical type automatic welding.
Preferably, weldment preheating adopts flame or carries out with the resistor disc of thermocouple.
Maximum weld heat input of the present invention is only 29KJ/CM, reduces heat input to a great extent, is more conducive to the welding deformation controlling product, makes welding deformation less; Use method provided by the invention to weld SA738GR.B steel plate, spatter rate is little, and appearance of weld is attractive in appearance, and weld seam every good mechanical properties, particularly weld seam, under as-welded and 10 hours conditions of heat treatment, can keep good low-temperature impact toughness; Welding procedure of the present invention breaches the single manual electric arc welding method of current SA738GR.B, manual semi-automatic welding and mechanical type automatic welding can be adopted, consumable electrode gas-arc semiautomatic welding deposition efficiency is 1.5 times of manual electric arc welding, mechanical type automatic welding deposition efficiency is 2.5 times of manual electric arc welding, and welding efficiency improves greatly; Meanwhile, the present invention also greatly reduces workman's number, reduces production cost; in addition, because gas metal-arc welding welding wire deposition efficiency is large, identical welding capacity; the amount of purchase of gas metal-arc welding welding wire used is the half of welding rod, further saves production cost.
Detailed description of the invention
Embodiment 1
Select ASME gauge material SA738GR.B, test plate (panel) specification is 500mm*150mm*42.1mm, welds in downhand position.Groove type adopts symmetrical X-type groove, and bevel angle is 55 °.Group, to root gap 3mm, welds front unfitness of butt joint 0mm.
First carry out preheating with flame to weldment before welding, preheat temperature is 110 DEG C.ER90S-G (ASME SFA-5.28 A-NO.10, the F-NO.6) welding wire of diameter 1.0mm is adopted to carry out gas metal-arc welding welding (GMAW) during welding.Gas ratio is the Ar of the 80% and CO of 20%
2, gas flow is 15l/min, adopts DC reverse connection.
In welding process, the heat input used is no more than 22.5KJ/CM; Between welding process Zhong main road, temperature is 155 DEG C; Welding adopts mechanical type automatic welding to weld.
The weld seam welded under above-mentioned technique, every good mechanical properties.After tested, as-welded lower room temperature transverse tensile strength is respectively 665MPa, 680Mpa, and 200 DEG C of high temperature transverse tensile strength are respectively 575Mpa, 575Mpa, and-29 DEG C of impact test weld seam mean values are 191.2J; After being incubated 10 hours at post weld heat treatment 600 DEG C, room temperature transverse tensile strength is respectively: 635Mpa, 635Mpa, and 200 DEG C of high temperature transverse tensile strength are respectively 555Mpa, 550Mpa, and-29 DEG C of impact test weld seam mean values are 129.7J.Fact proved, weld seam, under as-welded and 10 hours conditions of heat treatment, can keep good low-temperature impact toughness.
Embodiment 2
Select ASME gauge material SA738GR.B, test plate (panel) specification is 500mm*150mm*42.1mm, welds in horizontal position.Groove type adopts symmetrical X-type groove, and bevel angle is 58 °.Group, to root gap 3mm, welds front unfitness of butt joint 0mm.
First carry out preheating with flame to weldment before welding, preheat temperature is 100 DEG C.ER90S-G (ASME SFA-5.28 A-NO.10, the F-NO.6) welding wire of diameter 1.2mm is adopted to carry out gas metal-arc welding welding (GMAW) during welding.Gas ratio is the Ar of the 80% and CO of 20%
2, gas flow is 17l/min, adopts DC reverse connection.
In welding process, the heat input used is no more than 17KJ/CM; Between welding process Zhong main road, temperature is 162 DEG C; Welding adopts mechanical type automatic welding to weld.
The weld seam welded under above-mentioned technique, every good mechanical properties.After tested, as-welded lower room temperature transverse tensile strength is respectively 695MPa, 700Mpa, and 200 DEG C of high temperature transverse tensile strength are respectively 580Mpa, 580Mpa, and-29 DEG C of impact test weld seam mean values are 242.3J; After being incubated 10 hours at post weld heat treatment 601 DEG C, room temperature transverse tensile strength is respectively: 665Mpa, 660Mpa, 200 DEG C of high temperature transverse tensile strength are respectively 565Mpa, 565Mpa,-29 DEG C of impact test weld seam mean values are 175.0J, at-60 DEG C, carry out drop weight test, continuous two pieces does not rupture.Fact proved, weld seam, under as-welded and 10 hours conditions of heat treatment, can keep good low-temperature impact toughness.
Embodiment 3
Select ASME gauge material SA738GR.B, test plate (panel) specification is 500mm*150mm*42.1mm, welds in vertical position of welding.Groove type adopts symmetrical X-type groove, and bevel angle is 60 °.Group, to root gap 3mm, welds front unfitness of butt joint 0mm.
First carry out preheating with flame to weldment before welding, preheat temperature is 105 DEG C.ER90S-G (ASME SFA-5.28 A-NO.10, the F-NO.6) welding wire of diameter 1.3mm is adopted to carry out gas metal-arc welding welding (GMAW) during welding.Gas ratio is the Ar of the 80% and CO of 20%
2, gas flow is 19l/min, adopts DC reverse connection.
In welding process, the heat input used is no more than 28.8KJ/CM; Between welding process Zhong main road, temperature is 200 DEG C; Welding adopts mechanical type automatic welding to weld.
The weld seam welded under above-mentioned technique, every good mechanical properties.After tested, as-welded lower room temperature transverse tensile strength is respectively 695MPa, 695Mpa, and 200 DEG C of high temperature transverse tensile strength are respectively 580Mpa, 570Mpa, and-29 DEG C of impact test weld seam mean values are 202.3J.After being incubated 10 hours at post weld heat treatment 602 DEG C, room temperature transverse tensile strength is respectively: 650Mpa, 675Mpa, and 200 DEG C of high temperature transverse tensile strength are respectively 560Mpa, 560Mpa, and-29 DEG C of impact test weld seam mean values are 176.3J.Fact proved, weld seam, under as-welded and 10 hours conditions of heat treatment, can keep good low-temperature impact toughness.
Embodiment 4
Select ASME gauge material SA738GR.B, test plate (panel) specification is 500mm*150mm*42.1mm, welds at overhead position.Groove type adopts symmetrical X-type groove, and bevel angle is 62 °.Group, to root gap 3mm, welds front unfitness of butt joint 0mm.
First carry out preheating with the resistor disc with thermocouple to weldment before welding, preheat temperature is 106 DEG C.ER90S-G (ASME SFA-5.28A-NO.10, the F-NO.6) welding wire of diameter 1.5mm is adopted to carry out gas metal-arc welding welding (GMAW) during welding.Gas ratio is the Ar of the 80% and CO of 20%
2, gas flow is 21l/min, adopts DC reverse connection.
In welding process, the heat input used is no more than 19.1KJ/CM; Between welding process Zhong main road, temperature is 155 DEG C; Manual semiautomatic welding is adopted to weld during welding.
The weld seam welded under above-mentioned technique, every good mechanical properties.After tested, as-welded lower room temperature transverse tensile strength is respectively 680MPa, 685Mpa, and 200 DEG C of high temperature transverse tensile strength are respectively 575Mpa, 570Mpa, and-29 DEG C of impact test weld seam mean values are 131J.After being incubated 10 hours at post weld heat treatment 604 DEG C, room temperature transverse tensile strength is respectively: 640Mpa, 650Mpa, and 200 DEG C of high temperature transverse tensile strength are respectively 590Mpa, 580Mpa, and-29 DEG C of impact test weld seam mean values are 129.7J.Fact proved, weld seam, under as-welded and 10 hours conditions of heat treatment, can keep good low-temperature impact toughness.
Embodiment 5
Select ASME gauge material SA738GR.B, monolithic steel plate radius of curvature is 23904mm, arc length 8591mm, thickness of slab 43mm, and steel plate lower end tangent line and horizontal plane angle are 11 °, and two blocks of identical steel plates splice.Welding includes downhand welding and vertical position of welding.Groove type adopts asymmetric X type groove, and inner side groove depth is 27mm, and outside groove depth is 16mm, and bevel angle is 65 °.Group to root gap downhand position be 3mm, vertical position of welding is 5mm, before welding, unfitness of butt joint downhand position and vertical position of welding are 5mm.
First carry out preheating with the resistor disc with thermocouple to weldment before welding, preheat temperature is 150 DEG C.ER90S-G (ASME SFA-5.28A-NO.10, the F-NO.6) welding wire of diameter 1.6mm is adopted to carry out gas metal-arc welding welding (GMAW) during welding.Gas ratio is the Ar of the 80% and CO of 20%
2, gas flow is 23l/min, adopts DC reverse connection.
In welding process, the heat input used is no more than 29KJ/CM; Between welding process Zhong main road, temperature is 168 DEG C; Inner side adopts mechanical type automatic welding to weld, and outside adopts manual semiautomatic welding to weld.
The weld seam welded under above-mentioned technique, every good mechanical properties.After tested, as-welded lower room temperature transverse tensile strength is respectively 675MPa, 675Mpa, and 200 DEG C of high temperature transverse tensile strength are respectively 595Mpa, 590Mpa, and-29 DEG C of impact test weld seam mean values are 189.3J.After being incubated 10 hours at post weld heat treatment 605 DEG C, room temperature transverse tensile strength is respectively: 660Mpa, 660Mpa, and 200 DEG C of high temperature transverse tensile strength are respectively 565Mpa, 565Mpa, and-29 DEG C of impact test weld seam mean values are 232J.Fact proved, weld seam, under as-welded and 10 hours conditions of heat treatment, can keep good low-temperature impact toughness.
Confirm through repeated multiple times experiment, welding procedure of the present invention the group that is suitable for require for: in downhand position, the front unfitness of butt joint of weldering is 0 ~ 3mm, and group is 0 ~ 5mm to root gap; In horizontal position, before weldering, unfitness of butt joint is 0 ~ 3mm, and group is 0 ~ 4mm to root gap; In vertical position of welding, before weldering, unfitness of butt joint is 0 ~ 5mm, and group is 0 ~ 5mm to root gap.
In above-mentioned all embodiments, the welding material that the present invention adopts is ASME gauge material SA738GR.B, and the welding effect of welding procedure provided by the present invention to this material is best, is suitable for too other low-alloy steel materials a lot.In addition, welding position of the present invention can be the combination of any one in downhand welding, horizontal position welding, vertical position welding and overhead welding four positions or optional position.
Claims (9)
1. a gas metal-arc welding welding method, first carry out preheating to SA738GR.B Plate Welding part before it is characterized in that welding, preheat temperature is 100 ~ 150 DEG C; The groove type of weldment adopts X-type groove, and bevel angle is 55 ° ~ 65 °; The heat input used in welding process is no more than 29KJ/CM.
2. gas metal-arc welding welding method according to claim 1, when it is characterized in that welding, selected gas is Ar and CO
2.
3. gas metal-arc welding welding method according to claim 2, when it is characterized in that welding, the flow of gas is 15 ~ 23l/min.
4. gas metal-arc welding welding method according to claim 2, when it is characterized in that welding, selected gas content is the Ar of the 80% and CO of 20%
2.
5. the gas metal-arc welding welding method according to claim 1 or 3, is characterized in that in welding process, and between road, temperature is no more than 200 DEG C.
6. gas metal-arc welding welding method according to claim 5, it is characterized in that welding position be in downhand welding, horizontal position welding, vertical position welding and overhead welding any one or its combination.
7. gas metal-arc welding welding method according to claim 6, is characterized in that in downhand position, and before weldering, unfitness of butt joint is 0 ~ 3mm, and group is 0 ~ 5mm to root gap; In horizontal position, before weldering, unfitness of butt joint is 0 ~ 3mm, and group is 0 ~ 4mm to root gap; In vertical position of welding, before weldering, unfitness of butt joint is 0 ~ 5mm, and group is 0 ~ 5mm to root gap.
8. gas metal-arc welding welding method according to claim 7, is characterized in that welding the combination of any one or both adopting manual semi-automatic welding, mechanical type automatic welding.
9. gas metal-arc welding welding method according to claim 8, is characterized in that weldment preheating adopts flame or carries out with the resistor disc of thermocouple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410452385.5A CN104308335A (en) | 2014-09-05 | 2014-09-05 | Gas metal arc welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410452385.5A CN104308335A (en) | 2014-09-05 | 2014-09-05 | Gas metal arc welding method |
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| CN104308335A true CN104308335A (en) | 2015-01-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107617803A (en) * | 2016-07-14 | 2018-01-23 | 中国核工业第五建设有限公司 | Nuclear power steel containment vessel circumferential weld automatic submerged arc horizontal welding technique |
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| JPH08108282A (en) * | 1994-10-07 | 1996-04-30 | Nippon Steel Corp | Method for welding steel, and manufacture of steel |
| CN101967886A (en) * | 2010-11-16 | 2011-02-09 | 中国核工业第五建设有限公司 | Assembly and installation methods of steel containment vessel of nuclear power station |
| CN102528318A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Gas shield welding wire for nuclear power |
| CN103394796A (en) * | 2013-06-27 | 2013-11-20 | 中广核工程有限公司 | Narrow gap groove of steel containment vessel of nuclear power station and automatic welding method thereof |
| CN103769727A (en) * | 2014-01-14 | 2014-05-07 | 中国核工业华兴建设有限公司 | Automatic welding method of nuclear plant steel safety shell |
-
2014
- 2014-09-05 CN CN201410452385.5A patent/CN104308335A/en active Pending
Patent Citations (5)
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| JPH08108282A (en) * | 1994-10-07 | 1996-04-30 | Nippon Steel Corp | Method for welding steel, and manufacture of steel |
| CN101967886A (en) * | 2010-11-16 | 2011-02-09 | 中国核工业第五建设有限公司 | Assembly and installation methods of steel containment vessel of nuclear power station |
| CN102528318A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Gas shield welding wire for nuclear power |
| CN103394796A (en) * | 2013-06-27 | 2013-11-20 | 中广核工程有限公司 | Narrow gap groove of steel containment vessel of nuclear power station and automatic welding method thereof |
| CN103769727A (en) * | 2014-01-14 | 2014-05-07 | 中国核工业华兴建设有限公司 | Automatic welding method of nuclear plant steel safety shell |
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| Title |
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| 于立学 等: "SA738Gr.B焊接工艺研究", 《电焊机》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107617803A (en) * | 2016-07-14 | 2018-01-23 | 中国核工业第五建设有限公司 | Nuclear power steel containment vessel circumferential weld automatic submerged arc horizontal welding technique |
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