CN104475919A - Manual electric arc welding technology of vitriol dew point corrosion resisting steel - Google Patents
Manual electric arc welding technology of vitriol dew point corrosion resisting steel Download PDFInfo
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- CN104475919A CN104475919A CN201410643182.4A CN201410643182A CN104475919A CN 104475919 A CN104475919 A CN 104475919A CN 201410643182 A CN201410643182 A CN 201410643182A CN 104475919 A CN104475919 A CN 104475919A
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- dew point
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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
- B23K9/02—Seam welding; Backing means; Inserts
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a manual electric arc welding technology of vitriol dew point corrosion resisting steel. The manual electric arc welding technology of the vitriol dew point corrosion resisting steel includes following concrete steps: (1) selecting a manual electric arc welding electrode, wherein yield strength ReL of base metal of the manual electric arc welding electrode is 340-400MPa, tensile strength Rm of the base metal of the manual electric arc welding electrode is 440-480Mpa, elongation A of the base metal of the manual electric arc welding electrode is 25-35%, ballistic work Akv of the base metal of the manual electric arc welding electrode under 20 degree centigrade is large than 100J, and corrosion rate of the base metal of the manual electric arc welding electrode under 70 degree centigrade in a 50% sulfuric acid solution is less than 10mg/(cm2.h); (2) before welding, drying the manual electric arc welding electrode under drying temperature of 320-380 degree centigrade before welding, and then placing the manual electric arc welding electrode in a heat preservation barrel; (3) in the welding, using a V-shaped groove as a manual electric arc welding groove when the sheet thickness is less than or equal to 15mm, using a double side V-shaped groove as the manual electric arc welding groove when the sheet thickness is larger than 15mm, and using welding technological parameters including a welding current of 60-210A, welding speed of 9-24cm/min and welding heat input quantity of 6-25KJ/cm, using multiple layer and multiple pass welding for a butt joint larger than 10mm in sheet thickness, and controlling temperature among layers of a weld seam below 200 degree centigrade. By using the manual electric arc welding technology of the vitriol dew point corrosion resisting steel, the butt joint not only has excellent comprehensive mechanical performance, but also has good vitriol corrosion resistance, and is strong in practicality and suitable for the welding of the vitriol dew point corrosion resisting steel.
Description
Technical field
The invention belongs to ferrous materials welding field, relate to the welding procedure that a kind of welding point comprehensive mechanical property is excellent, specifically a kind of manual arc welding technique of corrosionproof steel against sulfuric acid at dew point.
Background technology
Generally containing sulphur in fuel that industrial production uses (heavy oil, fire coal or house refuse), sulphur in fuel after combustion, sulfur dioxide will be generated, change into sulfur trioxide gas further under certain conditions, then water vapour can be tied and be incorporated in below certain temperature spot condensation formation sulfuric acid, cause serious corrosion to equipment, this corrosion phenomenon is called as corrosion of sulfuric acid at dew point.Meanwhile, various pressure vessels for the chemical industry also may due to the contact with sulfuric acid by sulfuric acid corrosion.
Thus, the various Welding Structures directly contacted with sulphuric acid dew point, sulfuric acid solution need to consider to use the special steel material being specifically designed to resistant to sulfuric acid dew point corrosion.Meanwhile, due to weld seam the part also direct and sulfuric acid contact of welding point, so weld seam needs to have corrosion resistance to sulfuric acid equally.
Current corrosionproof steel against sulfuric acid at dew point all uses common wlding to weld, and makes weld seam not have resistance to sulfuric acid energy, and often causes the weld defect such as pore, slag inclusion to accelerate weld corrosion because welding procedure is improper, has a strong impact on welded use safety.Thus, rational sulfuric acid corrosion steel welding technology has very important realistic meaning for the Welding Structure that sulfuric acid directly contacts.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, a kind of manual arc welding technique of corrosionproof steel against sulfuric acid at dew point is provided, welding point of the present invention not only has excellent comprehensive mechanical property, and there is good corrosion resistance to sulfuric acid, practical, be suitable for the welding of corrosionproof steel against sulfuric acid at dew point.
In order to solve above technical problem, the invention provides a kind of manual arc welding technique of corrosionproof steel against sulfuric acid at dew point, comprising following concrete steps:
(1) manual arc electrode matched with the low alloy steel plate of corrosion resistance to sulfuric acid dew point is selected, the yield strength ReL of described low alloy steel plate mother metal is 340-400MPa, tensile strength Rm is 440-480MPa, percentage elongation A is 25-35%, Impact energy Ak v > 100J when 20 DEG C, when 70 DEG C under 50% sulfuric acid solution condition corrosion rate < 10mg/(cm
2h);
(2), before welding, dried by manual arc electrode, bake out temperature is 320-380 DEG C, and is placed in heat-preserving container, take, and welding rod is dried at most 2 times in welding process;
(3) during welding, when thickness of slab is less than or equal to 15mm, manual electric arc welding groove adopts double V-groove, when thickness of slab is greater than 15mm, manual electric arc welding groove adopts two-sided double V-groove, welding condition: welding current is 60-210A, speed of welding is 9-24cm/min, thermal weld stress amount 6-25kJ/cm; Banjo fixing butt jointing plate thickness being greater than to 10mm adopts multi-pass welding, and its weld seam interlayer temperature controls below 200 DEG C.
When the present invention adopts above welding condition to weld, because welding current is 60-210A, speed of welding is 9-24cm/min, thermal weld stress amount 6-25kJ/cm; Banjo fixing butt jointing plate thickness being greater than to 10mm adopts multi-pass welding, its weld seam interlayer temperature controls below 200 DEG C, the Thermal Cycling of whole welding point, improve the weld metal of welding point and the microstructure and mechanical property of heat affected area, avoid the generation of the weld defect such as pore, slag inclusion simultaneously, reduce and slow down the corrosion of welding point; The welding procedure of simultaneously the present invention design also enhances the tensile property of welding point, bending property, weld seam firmness degree and the impact resistance of heat affected area and the corrosion resistance to sulfuric acid of welding point.
The technical scheme that the present invention limits further is:
Aforementioned, in step (1), manual arc electrode diameter is 2.5-5.0mm, and deposited metal tensile strength is greater than 450MPa; In step (3), deposited metal composition and percentage by weight thereof are: C:0.05-0.09%, Mn:0.48-0.82%, Si:0.25-0.40%, S :≤0.02%, P :≤0.02%, Cr:0.70-0.92%, Mo :≤0.01%, Sb:0.04-0.0.07%, surplus is Fe and inevitable impurity; And bevel angle is 50-70 ° in step (3), root does not stay root face, and groove fit-up gap is 2-3mm.
Further,
When manual arc electrode diameter is 2.5mm, welding current is 60-100A, and speed of welding is 9-15cm/min, thermal weld stress amount 6-12kJ/cm; When manual arc electrode diameter is 2.5-3.2mm, welding current is 60-140A, and speed of welding is 9-15cm/min, thermal weld stress amount 6-15kJ/cm; When manual arc electrode diameter is 3.2-5.0mm, welding current is 120-180A, and speed of welding is 12-18cm/min, thermal weld stress amount 10-18kJ/cm.
The invention has the beneficial effects as follows:
When the present invention adopts above welding condition to weld, because welding current is 60-210A, speed of welding is 9-24cm/min, thermal weld stress amount 6-25kJ/cm; Banjo fixing butt jointing plate thickness being greater than to 10mm adopts multi-pass welding, its weld seam interlayer temperature controls below 200 DEG C, the Thermal Cycling of whole welding point, improve the weld metal of welding point and the microstructure and mechanical property of heat affected area, avoid the generation of the weld defect such as pore, slag inclusion simultaneously, reduce and slow down the corrosion of welding point; The welding procedure of simultaneously the present invention design also enhances the tensile property of welding point, bending property, weld seam firmness degree and the impact resistance of heat affected area and the corrosion resistance to sulfuric acid of welding point.
Present invention process have employed suitable welding material and welding procedure, can not only ensure the comprehensive mechanical property that welding point is excellent, and can ensure that welding point has excellent corrosion resistance to sulfuric acid; And this welding procedure is without the need to carrying out weld preheating and post weld heat treatment, in welding procedure process, while ensureing to obtain high comprehensive performance welding point, reach the effect of efficient welding, practical, energy-efficient, the welding of corrosionproof steel against sulfuric acid at dew point; Meanwhile, the welding condition of the present invention's design is reasonable, effectively can avoid the generation of weld defect, thus avoid the welding point accelerated corrosion because weld defect causes.
Accompanying drawing explanation
Fig. 1 is double V-groove design drawing of the present invention;
Fig. 2 is two-sided double V-groove design drawing of the present invention;
Wherein, A-bevel angle, b-groove fit-up gap, t-thickness of slab.
Detailed description of the invention
embodiment 1
The present embodiment provides a kind of manual arc welding technique of corrosionproof steel against sulfuric acid at dew point, and structure as shown in Figure 1, comprises following concrete steps:
(1) select that to be of a size of 400mm(with test plate (panel) long) × 200mm(is wide) × 10mm(is thick) and the manual arc electrode that matches of low alloy steel plate, the yield strength ReL of test plate (panel) mother metal is 396MPa, tensile strength Rm is 479MPa, percentage elongation A is 27.5%, Impact energy Ak v > 100J when 20 DEG C, when 70 DEG C, under 50% sulfuric acid solution condition, corrosion rate is 7mg/(cm
2h);
(2), before welding, dried by manual arc electrode, bake out temperature is 320 DEG C, and is placed in heat-preserving container, takes in welding process, and welding rod drying 2 times;
(3) during welding, thickness of slab is 10mm, manual electric arc welding groove adopts double V-groove, bevel angle is 60 ± 5 °, and root does not stay root face, and groove fit-up gap is 2-3mm, welding condition: welding current is 110A, speed of welding is 12cm/min, thermal weld stress amount 8-10kJ/cm, and its weld seam interlayer temperature controls below 200 DEG C.
The welding material of coupling: manual arc electrode diameter is Φ 3.2mm, and deposited metal composition and percentage by weight are: C:0.05%, Mn:0.48%, Si:0.25%, S:0.02%, P:0.02%, Cr:0.70%, Mo:0.01%, Sb:0.04%, surplus is Fe and inevitable impurity.
embodiment 2
The present embodiment provides a kind of manual arc welding technique of corrosionproof steel against sulfuric acid at dew point, and structure as shown in Figure 2, comprises following concrete steps:
(1) select and 400mm(long) × 200mm(is wide) × 40mm(is thick) the manual arc electrode that matches of low alloy steel plate, the yield strength ReL of test plate (panel) mother metal is 344MPa, tensile strength Rm is 444MPa, percentage elongation A is 29.5%, Impact energy Ak v > 100J when 20 DEG C, 0 DEG C, corrosion rate is less than 7mg/(cm under 50% sulfuric acid solution condition
2h);
(2), before welding, dried by manual arc electrode, bake out temperature is 380 DEG C, and is placed in heat-preserving container, takes in welding process, and welding rod drying 1 time;
(3) during welding, thickness of slab is 10mm, manual electric arc welding groove adopts two-sided double V-groove, bevel angle is 60 ± 5 °, and root does not stay root face, and groove fit-up gap is 2-3mm, welding condition: welding current is 120A, speed of welding is 12cm/min, thermal weld stress amount 9-11kJ/cm, and its weld seam interlayer temperature controls below 200 DEG C.
The welding material of coupling: manual arc electrode diameter is Φ 4.0mm, and deposited metal composition and percentage by weight are: C:0.09%, Mn:0.82%, Si:0.40%, S:0.01%, P:0.01%, Cr:0.92%, Mo:0.005%, Sb:0.07%, surplus is Fe and inevitable impurity.
embodiment 3
The present embodiment provides a kind of manual arc welding technique of corrosionproof steel against sulfuric acid at dew point, and structure as shown in Figure 2, comprises following concrete steps:
(1) select and 400mm(long) × 200mm(is wide) × 20mm(is thick) the manual arc electrode that matches of low alloy steel plate, the yield strength ReL of test plate (panel) mother metal is 362MPa, tensile strength Rm is 464MPa, percentage elongation A is 27.7%, Impact energy Ak v > 100J when 20 DEG C, 0 DEG C, corrosion rate is less than 7mg/(cm under 50% sulfuric acid solution condition
2h);
(2), before welding, dried by manual arc electrode, bake out temperature is 350 DEG C, and is placed in heat-preserving container, takes in welding process, and welding rod drying 2 times;
(3) during welding, thickness of slab is 20mm, manual electric arc welding groove adopts two-sided double V-groove, bevel angle is 60 ± 5 °, and root does not stay root face, and groove fit-up gap is 2-3mm, welding condition: welding current is 150A, speed of welding is 14cm/min, thermal weld stress amount 11-12kJ/cm, and its weld seam interlayer temperature controls below 200 DEG C.
The welding material of coupling: manual arc electrode diameter is Φ 4.6mm, and deposited metal composition and percentage by weight are: C:0.07%, Mn:0.64%, Si:0.32%, S:0.005%, P:0.005%, Cr:0.84%, Mo:0.001%, Sb:0.05%, surplus is Fe and inevitable impurity.
Welding method through above-described embodiment 1-3 carries out gas shield postwelding to corrosionproof steel against sulfuric acid at dew point, and Welded Joints carries out radiographic inspection, mechanical property and corrosion resistance to sulfuric acid and detects.
Welding point 70 DEG C, under 50% sulfuric acid solution condition after 72 hours of corrosion, amplify 200 times of observations by observation by light microscope, weld seam position is not less than mother metal, illustrates that the corrosion resisting property of weld metal is not less than mother metal.
Welding joint mechanical property and corrosion resistance to sulfuric acid testing result as shown in table 1:
The combination property of table 1 welding point
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (5)
1. a manual arc welding technique for corrosionproof steel against sulfuric acid at dew point, is characterized in that, comprise following concrete steps:
(1) manual arc electrode matched with the low alloy steel plate of corrosion resistance to sulfuric acid dew point is selected, the yield strength ReL of described low alloy steel plate mother metal is 340-400MPa, tensile strength Rm is 440-480MPa, percentage elongation A is 25-35%, Impact energy Ak v > 100J when 20 DEG C, when 70 DEG C under 50% sulfuric acid solution condition corrosion rate < 10mg/(cm
2h);
(2), before welding, dried by manual arc electrode, bake out temperature is 320-380 DEG C, and is placed in heat-preserving container, take, and welding rod is dried at most 2 times in welding process;
(3) during welding, when thickness of slab is less than or equal to 15mm, manual electric arc welding groove adopts double V-groove, when thickness of slab is greater than 15mm, manual electric arc welding groove adopts two-sided double V-groove, welding condition: welding current is 60-210A, speed of welding is 9-24cm/min, thermal weld stress amount 6-25kJ/cm; Banjo fixing butt jointing plate thickness being greater than to 10mm adopts multi-pass welding, and its weld seam interlayer temperature controls below 200 DEG C.
2. the manual arc welding technique of corrosionproof steel against sulfuric acid at dew point according to claim 1, is characterized in that, in step (1), described manual arc electrode diameter is 2.5-5.0mm, and deposited metal tensile strength is greater than 450MPa.
3. the manual arc welding technique of corrosionproof steel against sulfuric acid at dew point according to claim 1, it is characterized in that, in step (3), described deposited metal composition and percentage by weight thereof are: C:0.05-0.09%, Mn:0.48-0.82%, Si:0.25-0.40%, S :≤0.02%, P :≤0.02%, Cr:0.70-0.92%, Mo :≤0.01%, Sb:0.04-0.0.07%, surplus is Fe and inevitable impurity.
4. the manual arc welding technique of corrosionproof steel against sulfuric acid at dew point according to claim 1, is characterized in that, in step (3), described bevel angle is 50-70 °, and root does not stay root face, and groove fit-up gap is 2-3mm.
5. the manual arc welding technique of corrosionproof steel against sulfuric acid at dew point according to claim 2, is characterized in that, when described manual arc electrode diameter is 2.5mm, welding current is 60-100A, and speed of welding is 9-15cm/min, thermal weld stress amount 6-12kJ/cm; When described manual arc electrode diameter is 2.5-3.2mm, welding current is 60-140A, and speed of welding is 9-15cm/min, thermal weld stress amount 6-15kJ/cm; When manual arc electrode diameter is 3.2-5.0mm, welding current is 120-180A, and speed of welding is 12-18cm/min, thermal weld stress amount 10-18kJ/cm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104907738A (en) * | 2015-05-25 | 2015-09-16 | 武汉铁锚焊接材料股份有限公司 | Special welding rod for sulfuric acid dew point corrosion-resistant steel |
| CN111590237A (en) * | 2020-05-26 | 2020-08-28 | 南京钢铁股份有限公司 | Arc welding electrode for ultralow-temperature high-manganese steel and preparation method thereof |
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| CN101332528A (en) * | 2008-08-04 | 2008-12-31 | 武汉钢铁(集团)公司 | High intensity bridge steel manual welding technique method |
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| CN111590237A (en) * | 2020-05-26 | 2020-08-28 | 南京钢铁股份有限公司 | Arc welding electrode for ultralow-temperature high-manganese steel and preparation method thereof |
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