CN102756218B - Benzene hydrogenation engineering heat resisting steel method for welding pipeline - Google Patents
Benzene hydrogenation engineering heat resisting steel method for welding pipeline Download PDFInfo
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Abstract
A kind of benzene hydrogenation engineering heat resisting steel method for welding pipeline; with TIG pulsating welder with GTAW welding 12Cr2Mo trade mark pearlite heatproof steel; the supply of material state of described heat resisting steel is 730 ~ 750 DEG C of tempering; it is characterized in that comprising the following steps: the cutting of a, pipeline section and retaining wall on slope; b, provide argon protective device; c, weld preheating, d, welding and e, post weld heat treatment.Benzene hydrogenation engineering heat resisting steel method for welding pipeline of the present invention has the advantage that construction procedure is reasonable in design, simple to operate, welding quality is safe and reliable and reduce Construction Cost.
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 method for welding pipeline.
Background technology
The technique of benzol hydro refining unit 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.Benzene hydrogenation engineering be mainly divided into 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), full factory powers and the illumination of full factory, torch and engineering affiliated facility, lightning protection, fire prevention, explosion-proof particular/special requirement is had in the electrical install of these facilities, wherein benzene hydrogenation engineering processing medium pipeline is conveying high temperature, high pressure, inflammable, explosive medium, whole special material pipeline construction technology quality standard is high, require tight, the pipeline welding of benzene hydrogenation engineering heat resisting steel is the important component part of whole engineering.Current domestic built or be still in the stage lack of standardization building the pipeline welding of benzene hydrogenation engineering heat resisting steel, there is a lot of not science, irrational place, manufacturing process is numerous and diverse, manufacturing cost is high.
Therefore known benzene hydrogenation engineering heat resisting steel pipeline welding also exists above-mentioned all inconvenience and problem.
Summary of the invention
Object of the present invention, is to propose a kind of safe and reliable benzene hydrogenation engineering heat resisting steel method for welding pipeline.
For achieving the above object, technical solution of the present invention is:
A kind of benzene hydrogenation engineering heat resisting steel method for welding pipeline, with TIG pulsating welder with GTAW welding 12Cr2Mo trade mark pearlite heatproof steel, the supply of material state of described heat resisting steel is 730 ~ 750 DEG C of tempering, it is characterized in that comprising the following steps:
The cutting of a, pipeline section and retaining wall on slope
Adopt plasma arc or gas flame cuttiug pipeline section, and cut out portion leaves machine-finish allowance, to remove quench-hardened case and over-heat metal;
B, provide argon protective device
The protective device of argon filling in the interior swollen centering rubber seal ring of employing, or the protective device adopting blind plate and the interior locally argon filling of pipe on flange;
C, weld preheating
Adopt oxy-acetylene flame local heat preheating method, the width of preheating is centered by weld seam, and every hem width degree is 3 times of pipeline wall thickness, and is not less than 100mm; During tubing wall thickness >=6mm, preheat temperature is 250 ~ 350 DEG C, adopts TIG bottoming, can reduce by 50 DEG C of preheatings by lower limit; Be less than 60mm for external diameter, wall thickness is less than the pipe of 6mm, and when adopting TIG, preheat temperature is 50 ~ 100 DEG C;
D, welding, comprise the following step:
(1) preweld cleaning: adopt steel-wire sanding wheel or wire brush to be removed by groove Ji Jinfeng district 30mm both side surface dirt to pipe joint, keep argon protective device to clean;
(2) weld bond assembling is not taked to force counterpart tack welding, avoids the residual stress of toe of the weld;
(3) the disposable welding of per pass weld bond is complete, carries out interlayer cleaning before second layer welding; Second layer welding point will stagger 20 ~ 30mm, keeps interlayer temperature to be not less than preheat temperature in welding process; During multi-pass welding, the thickness of every layer of deposited metal is 3mm;
(4), when carrying out argon arc welding welding at low ambient temperatures, welding protection gas need be adjusted to more than 15 seconds lag time, an end must not be welded and move welding gun at once;
E, post weld heat treatment
(1), after welding job stops, post weld heat treatment is carried out immediately; If can not carry out post weld heat treatment immediately, carry out after heat, its width of heating is not less than width during preheating; Wherein: right
pipeline, adopt the pipe welding port of full argon arc welding and weld preheating and postweld heat preservation measure not do post weld heat treatment;
with
pipeline will do post weld heat treatment;
(2) pearlite heatproof steel post weld heat treatment temperature is 715 DEG C;
(3) the post weld heat treatment temperature of weld bond is 715 ± 15 DEG C;
(4), when welding point is heat-treated, below 500 DEG C, slowly heating, will be rapidly heated after being heated to more than 500 DEG C, dangerous temperature district, avoid in dangerous temperature district temperature retention time long as far as possible;
(5) when temperature drops to 300 DEG C, can direct Air flow.
Benzene hydrogenation engineering heat resisting steel method for welding pipeline of the present invention can also be further achieved by the following technical measures.
Aforesaid method, in wherein said step a, the diameter of welding pipeline section is
and pipe thickness is 3mm ~ 7mm.
Aforesaid method, in wherein said step a, the pipe joint of more than the pipe thickness 3mm of pipeline section adopts machined finished edge, and α=35 °, p=0, b=2.0 ~ 2.4, b are the gap between the banjo fixing butt jointing root of heat resisting steel pipeline.
Aforesaid method, in wherein said step a, the arm pipe joint of more than the pipe thickness 3mm of pipeline section adopts machined finished edge, and α=50 °, p=0, b=2.0 ~ 2.4, b are the gap between the banjo fixing butt jointing root of heat resisting steel pipeline.
Aforesaid method, in wherein said steps d, during welding, the TIG welding parameter of pearlite heatproof steel is:
Aforesaid method, in wherein said steps d, uses purity >=99.99% argon gas during welding, to prevent gaseous impurity to the pollution of welding region.
Aforesaid method, in wherein said steps d, leads to argon gas a period of time in advance before weldering, heat-resisting steel sheet and plate testpieces carries out test weld, and adjustment welding gun argon flow amount.
Aforesaid method, in wherein said steps d, in welding process, welding wire termination can not depart from arc protection region, and finds that the phenomenon of welding wire termination aerobic cuts off immediately and could continue to weld.
Aforesaid method, in wherein said steps d, in welding process, welding current gets the lower limit of applicable norm, reduces the scope of welding heat affected zone as far as possible.
Aforesaid method, in wherein said steps d, in welding process, delayed gas is adjusted to more than 15 seconds, must not weld an end, move welding gun at once.
Aforesaid method, wherein said steps d, in (2), must not impact with iron hammer in assembling tack welding process on pipe test specimen.
Aforesaid method, wherein said step e, in (3), post weld heat treatment programming rate is: 6250/ δ, and unit DEG C/h, δ are pipe thickness; Temperature retention time: 0.75h; Cooling rate is: 6250/ δ, δ are pipe thickness, unit DEG C/h.
After adopting technique scheme, benzene hydrogenation engineering heat resisting steel method for welding pipeline 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, Construction Cost is reduced.
Accompanying drawing explanation
Fig. 1 is the tube and tube banjo fixing butt jointing divided edge structure schematic diagram of the embodiment of the present invention;
Fig. 2 is the tube and tube banjo fixing butt jointing bevel angle schematic diagram of the embodiment of the present invention;
Fig. 3 is pipe and the bump joint bevel angle schematic diagram of the embodiment of the present invention;
Fig. 4 be the embodiment of the present invention tube and tube banjo fixing butt jointing pipeline in protective device schematic diagram;
Fig. 5 is the pipe of the embodiment of the present invention and the protective device schematic diagram of Flange joint weld bond;
Fig. 6 is the post weld heat treatment curve map of the embodiment of the present invention.
In figure: 1 rubber seal ring, 2 clamping plate, 3 joints, 4 air guide steel pipes, 5 argon inlet holes, 6 rubber gasket sheets, 7 blind plates.
Detailed description of the invention
The present invention is further illustrated below by way of specific embodiment and accompanying drawing thereof.
Embodiment 1
Benzene hydrogenation engineering heat resisting steel method for welding pipeline of the present invention, with TIG pulsating welder with GTAW welding 12Cr2Mo trade mark pearlite heatproof steel, the supply of material state of described heat resisting steel is 730 ~ 750 DEG C of tempering, it is characterized in that comprising the following steps:
Fig. 1 is the tube and tube banjo fixing butt jointing divided edge structure schematic diagram of the embodiment of the present invention, and Fig. 2 is the tube and tube banjo fixing butt jointing bevel angle schematic diagram of the embodiment of the present invention, carries out the tube and tube banjo fixing butt jointing welding of heat resisting steel pipeline.
The cutting of a, pipeline section and retaining wall on slope
Adopt plasma arc or gas flame cuttiug pipeline section, and cut out portion leaves machine-finish allowance, so that removing quench-hardened case and over-heat metal; The diameter of welding pipeline section is
and pipe thickness is 3mm ~ 7mm; The pipe joint of more than the pipe thickness 3mm of pipeline section adopts machined finished edge, α=35 °, p=0, b=2.0 ~ 2.4; The arm pipe joint of more than the pipe thickness 3mm of pipeline section adopts machined finished edge, α=50 °, p=0, b=2.0 ~ 2.4.
B, provide argon protective device
Fig. 4 be the embodiment of the present invention tube and tube banjo fixing butt jointing pipeline in protective device schematic diagram, the protective device of argon filling in swollen centering rubber seal ring in adopting.
C, weld preheating
Weld preheating: consider site environment, preheating method adopts oxy-acetylene flame local heat, and the width of preheating is centered by weld seam, and every hem width degree is 3 times of pipeline wall thickness, and is not less than 100mm; During tubing wall thickness >=6mm, preheat temperature is 250 ~ 350 DEG C, according to site operation situation, adopts TIG bottoming, can reduce by 50 DEG C of preheatings by lower limit; Be less than 60mm for external diameter, wall thickness is less than the pipe of 6mm, and when adopting TIG, preheat temperature is 50 ~ 100 DEG C;
D, welding, comprise the following step:
(1) preweld cleaning: adopt steel-wire sanding wheel or wire brush to be removed by groove Ji Jinfeng district 30mm both side surface dirt to pipe joint, keep argon protective device to clean;
(2) weld bond assembling is not taked 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 is complete, and carry out interlayer cleaning before second layer welding, second layer welding point will stagger 20 ~ 30mm, keeps interlayer temperature to be not less than preheat temperature in welding process; During multi-pass welding, the thickness of every layer of deposited metal is 3mm;
(4), when carrying out argon arc welding welding at low ambient temperatures, welding protection gas need be adjusted to more than 15 seconds lag time, an end must not be welded, move welding gun at once;
During welding, the TIG weldering standard parameter of pearlite heatproof steel is:
Purity >=99.99% argon gas is used, to prevent gaseous impurity to the pollution of welding region during welding; Lead to argon gas a period of time in advance before weldering, heat-resisting steel sheet and plate testpieces carries out test weld, and adjustment welding gun argon flow amount; In welding process, welding wire termination can not depart from arc protection region, and finds that the phenomenon of welding wire termination aerobic cuts off immediately and could continue to weld; In welding process, welding current gets the lower limit of applicable norm, reduces the scope of welding heat affected zone as far as possible; In welding process, delayed gas is adjusted to more than 15 seconds, must not weld an end, move welding gun at once; Must not impact with iron hammer on pipe test specimen in assembling tack welding process.
E, post weld heat treatment
Fig. 6 is the post weld heat treatment curve map of the embodiment of the present invention, and concrete heat treatment step is as follows:
(1) after welding job stops, post weld heat treatment is carried out immediately; If can not carry out post weld heat treatment immediately, carry out after heat, its width of heating is not less than width during preheating; Wherein: right
pipeline, according to the pipe welding port of full argon arc welding and weld preheating and postweld heat preservation measure, can not post weld heat treatment be done; Right
with
pipeline, do post weld heat treatment;
(2) pearlite heatproof steel post weld heat treatment temperature is 715 DEG C;
(3) the post weld heat treatment temperature of weld bond is 715 ± 15 DEG C, and intensification, insulation, cooling form are shown in heat treatment cycle curve Fig. 6.Heat treatment programming rate is: 6250/ δ, 6250/ δ, and unit DEG C/h, δ are pipe thickness; Temperature retention time: 0.75h; Cooling rate is: 6250/ δ, δ are pipe thickness, unit DEG C/h;
(4), when welding point is heat-treated, below 500 DEG C, slowly heating, will be rapidly heated after being heated to more than 500 DEG C, dangerous temperature district, avoid in dangerous temperature district temperature retention time long as far as possible;
(5) when temperature drops to 300 DEG C, can direct Air flow.
Embodiment 2
Fig. 3 is pipe and the bump joint bevel angle schematic diagram of the embodiment of the present invention, carries out pipe and the bump joint straddling type weld of heat resisting steel pipeline.Adopt plasma arc or machine cuts, bevel for welding Ji Jinfeng district adopts mechanical means removing oxidation stain floor; The arm pipe joint of more than pipe thickness 3mm adopts machined finished edge α=50 °, p=0, b=2.0 ~ 2.4.
Fig. 5 is the pipe of the embodiment of the present invention and the protective device schematic diagram of Flange joint weld bond, provides adopt blind plate and the protective device of managing interior local argon filling on flange with bump joint.The present embodiment other technologies feature is identical with embodiment 1.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, can also make various conversion or change.Therefore, all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.
Claims (12)
1. a benzene hydrogenation engineering heat resisting steel method for welding pipeline, with TIG pulsating welder with GTAW welding 12Cr2Mo trade mark pearlite heatproof steel, the supply of material state of described heat resisting steel is 730 ~ 750 DEG C of tempering, it is characterized in that comprising the following steps:
The cutting of a, pipeline section and retaining wall on slope
Adopt plasma arc or gas flame cuttiug pipeline section, and cut out portion leaves machine-finish allowance, to remove quench-hardened case and over-heat metal;
B, provide argon protective device
The protective device of argon filling in the interior swollen centering rubber seal ring of employing, or the protective device adopting blind plate and the interior locally argon filling of pipe on flange;
C, weld preheating
Adopt oxy-acetylene flame local heat preheating method, the width of preheating is centered by weld seam, and every hem width degree is 3 times of pipeline wall thickness, and is not less than 100mm; During tubing wall thickness >=6mm, preheat temperature is 250 ~ 350oC, adopts TIG bottoming, reduces 50oC preheating by lower limit; Be less than for external diameter the pipe that 60mm wall thickness is less than 6mm, when adopting TIG, preheat temperature is 50 ~ 100oC;
D, welding, comprise the following step:
(1) preweld cleaning: adopt steel-wire sanding wheel or wire brush to be removed by groove Ji Jinfeng district 30mm both side surface dirt to pipe joint, keep argon protective device to clean;
(2) weld bond assembling is not taked to force counterpart tack welding, avoids the residual stress of toe of the weld;
(3) the disposable welding of per pass weld bond is complete, carries out interlayer cleaning before second layer welding; Second layer welding point will stagger 20 ~ 30mm, keeps interlayer temperature to be not less than preheat temperature in welding process; During multi-pass welding, the thickness of every layer of deposited metal is 3mm;
(4), when carrying out argon arc welding welding at low ambient temperatures, welding protection gas need be adjusted to more than 15 seconds lag time, an end must not be welded and move welding gun at once;
E, post weld heat treatment
(1), after welding job stops, post weld heat treatment is carried out immediately; If can not carry out post weld heat treatment immediately, carry out after heat, its width of heating is not less than width during preheating; Wherein: to the pipeline of 45 × 4mm, the pipe welding port of full argon arc welding and weld preheating and postweld heat preservation measure is adopted not do post weld heat treatment; 108 × 5mm and 159 × 6mm pipeline will do post weld heat treatment;
(2) pearlite heatproof steel post weld heat treatment temperature is 715 DEG C;
(3) the post weld heat treatment temperature of weld bond is 715 ± 15 DEG C;
(4), when welding point is heat-treated, below 500 DEG C, slowly heating, will be rapidly heated after being heated to more than 500 DEG C, dangerous temperature district, avoid in dangerous temperature district temperature retention time long as far as possible;
(5) when temperature drops to 300 DEG C, direct Air flow.
2. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, it is characterized in that, in described step a, the diameter of welding pipeline section is 32 ~ 273mm, and pipe thickness is 3mm ~ 7mm.
3. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, it is characterized in that, in described step a, the pipe joint of more than the pipe thickness 3mm of pipeline section adopts machined finished edge, α=35 °, p=0, b=2.0 ~ 2.4mm, wherein: α is the angle between the vertical plane on weldment surface and groove face, p is the width of root face, and b is the gap between the tube and tube banjo fixing butt jointing root of heat resisting steel pipeline.
4. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, it is characterized in that, in described step a, the arm pipe joint of more than the pipe thickness 3mm of pipeline section adopts machined finished edge, α=50 °, p=0, b=2.0 ~ 2.4mm, wherein: α is the angle between the vertical plane on weldment surface and groove face, p is the width of root face, and b is the gap between the tube and tube banjo fixing butt jointing root of heat resisting steel pipeline.
5. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, it is characterized in that, in described steps d, during welding, the TIG welding parameter of pearlite heatproof steel is:
。
6. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, is characterized in that, in described steps d, uses purity >=99.99% argon gas, to prevent gaseous impurity to the pollution of welding region during welding.
7. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, is characterized in that, in described steps d, leads to argon gas a period of time in advance, heat-resisting steel sheet and plate testpieces carries out test weld before weldering, and adjustment welding gun argon flow amount.
8. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, it is characterized in that, in described steps d, in welding process, welding wire termination can not depart from arc protection region, and finds that the phenomenon of welding wire termination aerobic cuts off immediately and could continue to weld.
9. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, it is characterized in that, in described steps d, in welding process, welding current gets the lower limit of applicable norm, reduces the scope of welding heat affected zone as far as possible.
10. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, it is characterized in that, in described steps d, in welding process, delayed gas is adjusted to more than 15 seconds, must not weld an end, move welding gun at once.
11. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, is characterized in that, described steps d, in (2), must not impact in assembling tack welding process on pipe test specimen with iron hammer.
12. benzene hydrogenation engineering heat resisting steel method for welding pipeline as claimed in claim 1, it is characterized in that, described step e, in (3), post weld heat treatment programming rate is: 6250/ δ, and unit DEG C/h, δ are pipe thickness; Temperature retention time: 0.75h; Cooling rate is: 6250/ δ, δ are pipe thickness.
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| 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 |
| 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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