CN102756218A - Benzene hydrogenation engineering heat resistant steel pipeline welding method - Google Patents
Benzene hydrogenation engineering heat resistant steel pipeline welding method Download PDFInfo
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- CN102756218A CN102756218A CN2011101064327A CN201110106432A CN102756218A CN 102756218 A CN102756218 A CN 102756218A CN 2011101064327 A CN2011101064327 A CN 2011101064327A CN 201110106432 A CN201110106432 A CN 201110106432A CN 102756218 A CN102756218 A CN 102756218A
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Abstract
The invention provides a benzene hydrogenation engineering heat resistant steel pipeline welding method. By using a TIG pulsating welder, a pearlite heat resistant steel with a band number of 12 Cr2Mo is welded through manual argon tungsten-arc welding; the supply state of the heat resistant steel is that the heat resistant steel is annealed at 730-750 DEG C; and the welding method is characterized by comprising the following steps: (a) pipe section cutting and groove preparation, (b) providing an argon shield device, (c) preheating before welding, (d) welding and (e) heat treatment after welding. The benzene hydrogenation engineering heat resistant steel pipeline welding method provided by the invention has the advantages of reasonable construction step design, simplicity in operation and safe and reliable welding quality, and the engineering construction cost is reduced.
Description
Technical field
The present invention relates to a kind of method for welding pipeline, specifically, is a kind of benzene hydrogenation engineering heat resisting steel pipeline welding method.
Background technology
The technology of benzene hydrogenation device is more special, its system complex, and equipment is many, and the pressure of system own, temperature are higher, and pumping unit does not allow idle running.The benzene hydrogenation engineering mainly is divided into the affiliated facility of central control room and electric substation, refining plant, water supply and sewage work, air compression station, storage and handling facility (tank field and pump house), the power supply of full factory and the illumination of full factory, torch and engineering; Lightning protection, fire prevention, explosion-proof specific (special) requirements are arranged in the electric installation of these facilities; Wherein benzene hydrogenation engineering process medium pipeline is and carries high temperature, high pressure, inflammable, explosive medium; Whole special material pipeline construction technology quality standard is high; Require sternly, the welding of benzene hydrogenation engineering heat resisting steel pipeline is the important component part of whole engineering.At present domesticly built or still be in the stage lack of standardization building, existed much not science, irrational place, manufacturing process is numerous and diverse, manufacturing cost is high.
Therefore known benzene hydrogenation engineering heat resisting steel pipeline welding exists above-mentioned all inconvenience and problem.
Summary of the invention
The object of the invention is to propose a kind of safe and reliable benzene hydrogenation engineering heat resisting steel pipeline welding method.
For realizing above-mentioned purpose, technical solution of the present invention is:
A kind of benzene hydrogenation engineering heat resisting steel pipeline welding method, with GTAW welding 12Cr2Mo trade mark pearlite heatproof steel, the supply of material state of said heat resisting steel is 730～750 ℃ of tempering, it is characterized in that may further comprise the steps with the TIG pulsating welder:
A, pipeline section cutting and groove processing
Adopt plasma arc or flame cutting pipeline section, and notch portion leaves machine-finish allowance, so that remove quench-hardened case and over-heat metal;
B, argon protective device is provided
Expand in the adopting protective device of applying argon gas in the centering rubber seal ring perhaps adopts on the flange protective device of local applying argon gas in the blind plate and pipe;
C, weld preheating
Adopt oxy-acetylene flame local heat preheating method, the width of preheating is the center with the weld seam, and every hem width degree is 3 times of pipeline wall thickness, and is not less than 100mm; During duct wall thickness >=6mm, preheat temperature is 250～350oC, adopts the TIG bottoming, can reduce the 50oC preheating by lower limit; Less than 60mm, wall thickness is less than the pipe of 6mm for external diameter, and when adopting TIG, preheat temperature is 50～100oC;
D, welding comprise the following step:
(1) preweld cleaning: adopt steel wire emery wheel or wire brush that groove and nearly seam district 30mm both side surface dirt are removed to pipe joint, keep the argon protective device cleaning;
(2) the weld bond assembling is not taked to force the counterpart tack welding, avoids the residual stress of toe of the weld;
(3) the disposable welding of per pass weld bond finishes, and carries out the interlayer cleaning before the second layer welding; The second layer welding point 20～30mm that will stagger keeps interlayer temperature to be not less than preheat temperature in the welding process; The thickness of every layer of deposited metal is 3mm during multi-pass welding;
When (4) under low temperature environment, carrying out the argon arc welding welding, need welding protection gas is adjusted to more than 15 seconds lag time, must not weld one and finish to move at once welding gun;
E, post weld heat treatment
(1) after welding job stops, carrying out post weld heat treatment immediately; If can not carry out post weld heat treatment immediately, carry out after heat, the width when its width of heating is not less than preheating; Wherein:, adopt the pipe welding port of full argon arc welding and weld preheating and postweld heat preservation measure can not do post weld heat treatment to the pipeline of 45 * 4mm; 108 * 5mm and 159 * 6mm pipeline will be done post weld heat treatment;
(2) pearlite heatproof steel post weld heat treatment temperature is 715 ℃;
(3) the post weld heat treatment temperature of weld bond is 715 ± 15 ℃;
When (4) welding point is heat-treated,, be heated to the dangerous temperature district and will be rapidly heated after more than 500 ℃, avoid in the dangerous temperature district temperature retention time long as far as possible in slowly heating below 500 ℃;
(5) when temperature drops to 300 ℃, directly air cooling.
Benzene hydrogenation engineering heat resisting steel pipeline welding method of the present invention can also adopt following technical measures further to realize.
Aforesaid method, among the wherein said step a, the diameter of welding pipeline section is 32～273mm, and pipe thickness is 3mm～7mm.
Aforesaid method, among the wherein said step a, the above pipe joint of the pipe thickness 3mm of pipeline section adopts machined finished edge, α=30+5 °, p=0, b=2.0mm～2.4mm.
Aforesaid method, among the wherein said step a, the above arm pipe joint of the pipe thickness 3mm of pipeline section adopts machined finished edge, α=45+5 °, p=0, b=2.0mm～2.4mm.
Aforesaid method, in the wherein said steps d, the TIG welding parameter of pearlite heatproof steel is during welding:
Aforesaid method in the wherein said steps d, is used purity >=99.99% argon gas, to prevent the pollution of gaseous impurity to welding region during welding.
Aforesaid method in the wherein said steps d, is led to argon gas a period of time before the weldering in advance, on the heat-resisting steel sheet and plate testpieces, carries out test weld, and adjustment welding gun argon flow amount.
Aforesaid method, in the wherein said steps d, the welding wire termination can not break away from the arc protection zone in the welding process, and the phenomenon of finding welding wire termination aerobicization cuts off immediately and could continue to weld.
Aforesaid method, in the wherein said steps d, welding current is got the lower limit of applicable norm in the welding process, reduces the scope of welding heat affected zone as far as possible.
Aforesaid method, in the wherein said steps d, hysteresis gas transferred to more than 15 seconds in the welding process, must not weld an end, moved welding gun at once.
Aforesaid method, wherein said steps d in (2), must not impact with iron hammer on the pipe test specimen in the assembling tack welding process.
Aforesaid method, wherein said step e, in (3), the post weld heat treatment programming rate is: 6250/ δ, unit ℃/h, δ is a pipe thickness; Temperature retention time: 0.75h; Cooling rate is: 6250/ δ, δ are pipe thickness, unit ℃/h.
After adopting technique scheme, benzene hydrogenation engineering heat resisting steel pipeline welding method of the present invention has the following advantages:
1, construction procedure is reasonable in design, simple to operate;
2, welding quality is safe and reliable;
3, reduce the engineering construction cost.
Description of drawings
Fig. 1 is the tube and tube banjo fixing butt jointing divided edge structure sketch map of the embodiment of the invention;
Fig. 2 is the tube and tube banjo fixing butt jointing bevel angle sketch map of the embodiment of the invention;
Fig. 3 is the pipe and the bump joint bevel angle sketch map of the embodiment of the invention;
Fig. 4 is the interior protective device sketch map of the tube and tube banjo fixing butt jointing pipeline of the embodiment of the invention;
Fig. 5 is the pipe of the embodiment of the invention is connected weld bond with flange a protective device sketch map;
Fig. 6 is the post weld heat treatment curve map of the embodiment of the invention.
Among the figure: 1 rubber seal ring, 2 clamping plate, 3 joints, 4 air guide steel pipes, 5 argon gas air admission holes, 6 rubber gasket sheets, 7 blind plates.
The specific embodiment
Below further specify the present invention through specific embodiment and accompanying drawing thereof.
Benzene hydrogenation engineering heat resisting steel pipeline welding method of the present invention, with GTAW welding 12Cr2Mo trade mark pearlite heatproof steel, the supply of material state of said heat resisting steel is 730～750 ℃ of tempering, it is characterized in that may further comprise the steps with the TIG pulsating welder:
Fig. 1 is the tube and tube banjo fixing butt jointing divided edge structure sketch map of the embodiment of the invention, and Fig. 2 is the tube and tube banjo fixing butt jointing bevel angle sketch map of the embodiment of the invention, carries out the tube and tube banjo fixing butt jointing welding of heat resisting steel pipeline.
A, pipeline section cutting and groove processing
Adopt plasma arc or flame cutting pipeline section, and notch portion leaves machine-finish allowance, so that remove quench-hardened case and over-heat metal; The diameter of welding pipeline section is 32～273mm, and pipe thickness is 3mm～7mm; The above pipe joint of the pipe thickness 3mm of pipeline section adopts machined finished edge, α=30+5 °, p=0, b=2.0mm～2.4mm; The above arm pipe joint of the pipe thickness 3mm of pipeline section adopts machined finished edge, α=45+5 °, p=0, b=2.0mm～2.4mm.
B, argon protective device is provided
Fig. 4 is the interior protective device sketch map of the tube and tube banjo fixing butt jointing pipeline of the embodiment of the invention, the protective device of the interior applying argon gas of centering rubber seal ring that expands in adopting.
C, weld preheating
Weld preheating: consider site environment, preheating method adopts the oxy-acetylene flame local heat, and the width of preheating is the center with the weld seam, and every hem width degree is 3 times of pipeline wall thickness, and is not less than 100mm; During duct wall thickness >=6mm, preheat temperature is 250～350oC, according to the site operation situation, adopts the TIG bottoming, can reduce the 50oC preheating by lower limit; Less than 60mm, wall thickness is less than the pipe of 6mm for external diameter, and when adopting TIG, preheat temperature is 50～100oC;
D, welding comprise the following step:
(1) preweld cleaning: adopt steel wire emery wheel or wire brush that groove and nearly seam district 30mm both side surface dirt are removed to pipe joint, keep the argon protective device cleaning;
(2) the weld bond assembling does not take to force counterpart tack welding (being preferably free state), avoids the residual stress of toe of the weld;
(3) the disposable welding of per pass weld bond finishes, and carries out the interlayer cleaning before the second layer welding, and the second layer welding point 20～30mm that will stagger keeps interlayer temperature to be not less than preheat temperature in the welding process; The thickness of every layer of deposited metal is 3mm during multi-pass welding;
When (4) under low temperature environment, carrying out the argon arc welding welding, need welding protection gas is adjusted to more than 15 seconds lag time, must not weld an end, move welding gun at once;
The TIG of pearlite heatproof steel weldering standard parameter is during welding:
Use purity >=99.99% argon gas during welding, to prevent the pollution of gaseous impurity to welding region; Lead to argon gas a period of time in advance before the weldering, on the heat-resisting steel sheet and plate testpieces, carry out test weld, and adjustment welding gun argon flow amount; The welding wire termination can not break away from the arc protection zone in the welding process, and the phenomenon of finding welding wire termination aerobicization cuts off immediately and could continue to weld; Welding current is got the lower limit of applicable norm in the welding process, reduces the scope of welding heat affected zone as far as possible; Hysteresis gas transferred to more than 15 seconds in the welding process, must not weld an end, moved welding gun at once; Must not on the pipe test specimen, impact in the assembling tack welding process with iron hammer.
E, post weld heat treatment
Fig. 6 is the post weld heat treatment curve map of the embodiment of the invention, and concrete heat treatment step is following:
(1) after welding job stops, carrying out post weld heat treatment immediately; If can not carry out post weld heat treatment immediately, carry out after heat, the width when its width of heating is not less than preheating; Wherein:,, can not do post weld heat treatment if adopt the pipe welding port of full argon arc welding and weld preheating and postweld heat preservation measure to the pipeline of 45 * 4mm; To 108 * 5mm and 159 * 6mm pipeline, do post weld heat treatment;
(2) pearlite heatproof steel post weld heat treatment temperature is 715 ℃;
(3) the post weld heat treatment temperature of weld bond is 715 ± 15 ℃, and intensification, insulation, cooling form are seen heat treatment cycle curve Fig. 6.The heat treatment programming rate is: 6250/ δ, and 6250/ δ, unit ℃/h, δ is a pipe thickness; Temperature retention time: 0.75h; Cooling rate is: 6250/ δ, δ are pipe thickness, unit ℃/h;
When (4) welding point is heat-treated,, be heated to the dangerous temperature district and will be rapidly heated after more than 500 ℃, avoid in the dangerous temperature district temperature retention time long as far as possible in slowly heating below 500 ℃;
(5) when temperature drops to 300 ℃, directly air cooling.
Fig. 3 is the pipe and the bump joint bevel angle sketch map of the embodiment of the invention, carries out the pipe and the welding of bump joint straddling type joint of heat resisting steel pipeline.Adopt plasma arc or machine cuts, bevel for welding and nearly seam district adopt mechanical means to remove the oxidation stain layer; The above arm pipe joint of pipe thickness 3mm adopts α=45+5 ° of machined finished edge, p=0, b=2.0～2.4mm.
Fig. 5 is the pipe of the embodiment of the invention is connected weld bond with flange a protective device sketch map, provides with bump joint and adopts on the flange protective device of local applying argon gas in the blind plate and pipe.Present embodiment other technologies characteristic is identical with embodiment 1.
Above embodiment only supplies to explain the present invention's usefulness, but not limitation of the present invention, the technical staff in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or variation.Therefore, all technical schemes that are equal to also should belong to category of the present invention, should be limited each claim.
Claims (12)
1. a benzene hydrogenation engineering heat resisting steel pipeline welding method is welded 12Cr2Mo trade mark pearlite heatproof steel with the TIG pulsating welder with GTAW, and the supply of material state of said heat resisting steel is 730～750 ℃ of tempering, it is characterized in that may further comprise the steps:
A, pipeline section cutting and groove processing
Adopt plasma arc or flame cutting pipeline section, and notch portion leaves machine-finish allowance, so that remove quench-hardened case and over-heat metal;
B, argon protective device is provided
Expand in the adopting protective device of applying argon gas in the centering rubber seal ring perhaps adopts on the flange protective device of local applying argon gas in the blind plate and pipe;
C, weld preheating
Adopt oxy-acetylene flame local heat preheating method, the width of preheating is the center with the weld seam, and every hem width degree is 3 times of pipeline wall thickness, and is not less than 100mm; During duct wall thickness >=6mm, preheat temperature is 250～350oC, adopts the TIG bottoming, can reduce the 50oC preheating by lower limit; Less than 60mm, wall thickness is less than the pipe of 6mm for external diameter, and when adopting TIG, preheat temperature is 50～100oC;
D, welding comprise the following step:
(1) preweld cleaning: adopt steel wire emery wheel or wire brush that groove and nearly seam district 30mm both side surface dirt are removed to pipe joint, keep the argon protective device cleaning;
(2) the weld bond assembling is not taked to force the counterpart tack welding, avoids the residual stress of toe of the weld;
(3) the disposable welding of per pass weld bond finishes, and carries out the interlayer cleaning before the second layer welding; The second layer welding point 20～30mm that will stagger keeps interlayer temperature to be not less than preheat temperature in the welding process; The thickness of every layer of deposited metal is 3mm during multi-pass welding;
When (4) under low temperature environment, carrying out the argon arc welding welding, need welding protection gas is adjusted to more than 15 seconds lag time, must not weld one and finish to move at once welding gun;
E, post weld heat treatment
(1) after welding job stops, carrying out post weld heat treatment immediately; If can not carry out post weld heat treatment immediately, carry out after heat, the width when its width of heating is not less than preheating; Wherein:, adopt the pipe welding port of full argon arc welding and weld preheating and postweld heat preservation measure can not do post weld heat treatment to the pipeline of 45 * 4mm; 108 * 5mm and 159 * 6mm pipeline will be done post weld heat treatment;
(2) pearlite heatproof steel post weld heat treatment temperature is 715 ℃;
(3) the post weld heat treatment temperature of weld bond is 715 ± 15 ℃;
When (4) welding point is heat-treated,, be heated to the dangerous temperature district and will be rapidly heated after more than 500 ℃, avoid in the dangerous temperature district temperature retention time long as far as possible in slowly heating below 500 ℃;
(5) when temperature drops to 300 ℃, directly air cooling.
2. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that, among the said step a, the diameter of welding pipeline section is 32～273mm, and pipe thickness is 3mm～7mm.
3. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that, among the said step a, the above pipe joint of the pipe thickness 3mm of pipeline section adopts machined finished edge, α=30+5 °, p=0, b=2.0mm～2.4mm.
4. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that, among the said step a, the above arm pipe joint of the pipe thickness 3mm of pipeline section adopts machined finished edge, α=45+5 °, p=0, b=2.0mm～2.4mm.
5. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that in the said steps d, the TIG welding parameter of pearlite heatproof steel is during welding:
。
6. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that, in the said steps d, uses purity >=99.99% argon gas during welding, to prevent the pollution of gaseous impurity to welding region.
7. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that, in the said steps d, leads to argon gas a period of time in advance before the weldering, on the heat-resisting steel sheet and plate testpieces, carries out test weld, and adjustment welding gun argon flow amount.
8. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that in the said steps d, the welding wire termination can not break away from the arc protection zone in the welding process, and the phenomenon of finding welding wire termination aerobicization cuts off immediately and could continue to weld.
9. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that in the said steps d, welding current is got the lower limit of applicable norm in the welding process, reduces the scope of welding heat affected zone as far as possible.
10. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that in the said steps d, hysteresis gas transferred to more than 15 seconds in the welding process, must not weld an end, moves welding gun at once.
11. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that, said steps d in (2), must not impact with iron hammer on the pipe test specimen in the assembling tack welding process.
12. benzene hydrogenation engineering heat resisting steel pipeline welding method as claimed in claim 1 is characterized in that, said step e, and in (3), the post weld heat treatment programming rate is: 6250/ δ, unit ℃/h, δ is a pipe thickness; Temperature retention time: 0.75h; Cooling rate is: 6250/ δ, δ are pipe thickness, unit ℃/h.
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| CN103990895A (en) * | 2014-05-14 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Welding method for high-strength seamless steel tube |
| CN104874937A (en) * | 2015-06-15 | 2015-09-02 | 唐山师范学院 | Welding technology for bainite heat-resistant steel 12Cr2MoWVTiB |
| CN105033415A (en) * | 2015-07-09 | 2015-11-11 | 安徽金阳金属结构工程有限公司 | 15CrMo steel welding process |
| CN107009100A (en) * | 2017-05-11 | 2017-08-04 | 山东电力建设第工程公司 | A kind of new big footpath skew T preparation method |
| CN107214427A (en) * | 2017-05-16 | 2017-09-29 | 合肥市瀚坤机械有限公司 | One kind takes door frame welding procedure |
| CN107795721A (en) * | 2017-10-27 | 2018-03-13 | 四川精控阀门制造有限公司 | The valve rod neck inserting type welding structure and manufacture method of all-welded ball valve |
| CN107891216A (en) * | 2017-11-14 | 2018-04-10 | 宝鸡中铁宝桥天元实业发展有限公司 | High-strength steel thick plates stress concentration prevention method |
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| CN102962557A (en) * | 2012-11-06 | 2013-03-13 | 哈尔滨汽轮机厂有限责任公司 | Method for welding balancing air leakage pipe of medium-high pressure outer cylinder in turbine |
| CN103624378A (en) * | 2013-12-02 | 2014-03-12 | 昆山华恒焊接股份有限公司 | Pipeline butt joint hot wire TIG welding method |
| CN103990895A (en) * | 2014-05-14 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Welding method for high-strength seamless steel tube |
| CN104874937A (en) * | 2015-06-15 | 2015-09-02 | 唐山师范学院 | Welding technology for bainite heat-resistant steel 12Cr2MoWVTiB |
| CN105033415A (en) * | 2015-07-09 | 2015-11-11 | 安徽金阳金属结构工程有限公司 | 15CrMo steel welding process |
| CN107009100B (en) * | 2017-05-11 | 2019-10-11 | 山东电力建设第一工程公司 | A kind of novel major diameter skew T production method |
| CN107009100A (en) * | 2017-05-11 | 2017-08-04 | 山东电力建设第工程公司 | A kind of new big footpath skew T preparation method |
| CN107214427A (en) * | 2017-05-16 | 2017-09-29 | 合肥市瀚坤机械有限公司 | One kind takes door frame welding procedure |
| CN107795721A (en) * | 2017-10-27 | 2018-03-13 | 四川精控阀门制造有限公司 | The valve rod neck inserting type welding structure and manufacture method of all-welded ball valve |
| CN107891216A (en) * | 2017-11-14 | 2018-04-10 | 宝鸡中铁宝桥天元实业发展有限公司 | High-strength steel thick plates stress concentration prevention method |
| CN108098204A (en) * | 2017-12-29 | 2018-06-01 | 东方电气集团东方锅炉股份有限公司 | Girth welding oxygen-proof protecting device and its header stack shell welding method |
| CN108817610A (en) * | 2018-09-07 | 2018-11-16 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of 12Cr1MoVG path Thick Wall Tube Welding method |
| CN110091030A (en) * | 2019-05-24 | 2019-08-06 | 江苏格兰环境科技有限公司 | The welding procedure of heating furnace pipeline steel alloy |
| CN111618400A (en) * | 2020-03-13 | 2020-09-04 | 中国电建集团山东电力建设第一工程有限公司 | Tower type photo-thermal power generation fused salt pipeline welding process in alpine region |
| CN111618400B (en) * | 2020-03-13 | 2022-02-11 | 中国电建集团山东电力建设第一工程有限公司 | Tower type photo-thermal power generation fused salt pipeline welding process in alpine region |
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