CN106624411B - The method of reinforcement plate is welded between two big workpiece of the heat treatment temperature difference - Google Patents
The method of reinforcement plate is welded between two big workpiece of the heat treatment temperature difference Download PDFInfo
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- CN106624411B CN106624411B CN201611169125.2A CN201611169125A CN106624411B CN 106624411 B CN106624411 B CN 106624411B CN 201611169125 A CN201611169125 A CN 201611169125A CN 106624411 B CN106624411 B CN 106624411B
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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Abstract
The invention discloses the methods that reinforcement plate is welded between two big workpiece of the heat treatment temperature difference, this method is the preposition process of butt welding workpiece A and workpiece B, wherein the post weld heat treatment temperature of workpiece A is greater than workpiece B, comprising steps of S1: carrying out the preheating before built-up welding wait the place of docking to workpiece A and workpiece B, built-up welding is carried out after preheating, in weld deposit process, using the preheating temperature of overlay cladding, the preparatory composition backing on workpiece A and workpiece B；S2: to the overlay cladding progress post weld heat treatment on workpiece A and workpiece B, the fillet weld of backing plate and workpiece is also heat-treated together；S3: workpiece A and workpiece B are placed in after docking location, the both ends of reinforcement plate are respectively welded on the backing plate of workpiece A and workpiece B；S4: backing welding is carried out between workpiece A and workpiece B；S5: reinforcement plate is removed.Since the weld seam between reinforcement plate and backing plate is without heat treatment, when avoiding heat treatment, the heat treatment temperature of workpiece A has an adverse effect to the performance of workpiece B.
Description
Technical field
The invention belongs to welding technology fields, are related to the product that product group clock synchronization uses reinforcement plate fixed, can be used for boiler
And the group pair of the products such as pressure vessel.
Background technique
With the raising of power plant auxiliary machine parameter, shell ring material is being continuously improved, current No. 0 high adduction double reheat steam
In the products such as cooler, superheat section shell ring has used the high grade material such as 9Cr1MoV, 2.25Cr1MoV, in order to solve superheat section
The problem that shell ring can not be heat-treated after docking with tube sheet, the means mainly used at present are respectively in superheat section shell ring and tube sheet side
Built-up welding austenite material is docked again after being heat-treated respectively, is no longer heat-treated after docking.
When tube sheet is docked with shell ring, motor-driven submerged arc soldering method is mainly used at present, this method is by superheat section shell ring and pipe
Plate is individually positioned on two idler wheels of turning rolls 4, by idler wheel driving start building part rotation complete welding, since two workpiece are located at
On two idler wheels, when bottom welding, it is difficult to ensure that the fully synchronized rotation of two workpiece, in this case very due to backing weld seam
It is thin, it can be by drawing crack.Two workpiece can rotate synchronously when therefore, in order to guarantee bottom welding, can generally use welding equipment reinforcement plate at present
Mode two workpiece (workpiece A 1, workpiece B 2) are first connected as one (as shown in Figure 1), workpiece is again in turning rolls 4 later
Upper synchronous rotation completes manual welding bottom welding, after bottoming to certain thickness (generally 10-20mm) has enough bonding strengths,
Reinforcement plate is removed again, and entire weld seam is completed using motor-driven submerged arc welding.
But currently, can often cause following problems in such a way that welding reinforcement plate connects two workpiece: (1) due to tube sheet and
Shell ring has biggish cool attenuation, therefore while welding reinforcement plate has to first preheat, otherwise it is easy to appear crackle, by
It is one piece of welding spaced apart in reinforcement plate, preheats typically to welding region local preheating, but since workpiece is too big,
Rapid heat dissipation when preheating, local preheating tend not to guarantee preheating temperature in place, in this way will be it is easy to appear crackle, if whole preheating
Then the period is long, at high cost；(2) since shell ring and tube sheet have been completed heat treatment before assembling butt weld, it is subsequent no longer into
Row heat treatment, and if reinforcement plate is heat-treated directly with shell ring and Tube-sheet Welding by standard regulation, and reinforcement plate removal
Pit generally all can locally occur in workpiece surface afterwards, need to carry out repair welding to the pit of shell ring and tube sheet surface, repair welding weld seam is same
Sample is also required to be heat-treated, and considerably increases cost and production cycle in this way；(3) due to the heat treatment temperature of superheat section shell ring compared with
Height, and the heat treatment temperature of tube sheet is lower, the heat treatment temperature region that the two is not overlapped, and reinforcement plate welding position distance
Weld seam is close, causes to influence whether tube sheet when the reinforcement plate welding position on superheat section shell ring carries out above-mentioned heat treatment in this way
The performance of material.
Summary of the invention
Current reinforcement plate welding manner there are aiming at the problem that, i.e., 1) lacing wire plate welding seams are easy to appear crackle, and whole
Preheating causes the reinforcement plate weld preheating period long, at high cost again；2) the lacing wire plate welding seams (repair welding including workpiece after dismounting reinforcement plate
Weld seam) heat treatment is at high cost, the period is long；3) heat treatment of the higher workpiece of heat treatment temperature can be to the lower work of heat treatment temperature
The performance of part adversely affects.It is pre- between the workpiece docked by welding that the object of the present invention is to provide a kind of
The new method of reinforcement plate is welded, to overcome the problems of above-mentioned current reinforcement plate welding manner.
The technical solution adopted by the present invention to solve the technical problems is: welding and draws between two big workpiece of the heat treatment temperature difference
The method of gusset, this method are the preposition process of butt welding workpiece A and workpiece B, and wherein the post weld heat treatment temperature of workpiece A is big
The heat treatment temperature in section is not overlapped in the post weld heat treatment temperature and the two of workpiece B, comprising the following steps:
S1: the preheating before built-up welding is carried out wait the place of docking to workpiece A and workpiece B, in pair of workpiece A and workpiece B after preheating
Meeting place, built-up welding is Ni-based or the overlay cladding of austenite material, during built-up welding overlay cladding, using the preheating temperature of overlay cladding,
The preparatory composition backing in position of reinforcement plate to be welded on workpiece A and workpiece B；
S2: after the completion of above-mentioned built-up welding and backing plate welding, postwelding heat is carried out to the overlay cladding on workpiece A and workpiece B
Processing, during the heat treatment, the fillet weld of backing plate and workpiece is also heat-treated together；
S3: workpiece A and workpiece B are placed in after docking location, reinforcement plate one end are welded on the backing plate of workpiece A, separately
One end is welded on the backing plate of workpiece B, and when welding need to guarantee that joint environment temperature is more than or equal to 0 DEG C；
S4: between workpiece A and workpiece B after the complete all reinforcement plates of welding equipment, in the groove between workpiece A and workpiece B
Carry out backing welding；
S5: after the completion of backing welding, the reinforcement plate is removed, and remove remaining weld seam on backing plate；
S6: repair welding or polishing are carried out to the pit formed on backing plate when removing reinforcement plate, wherein be not necessarily at heat after repair welding
Reason；
The material and thickness of the backing plate are not necessarily to be heat-treated after can guarantee backing plate and reinforcement plate welding, i.e. the material of backing plate
Matter and thickness meet the regulation for exempting post weld heat treatment standard, it is seen that GB 150-2011 " pressure vessel " Part IV page 331
8.2.2.1 table 5 need to carry out the welding point thickness of post weld heat treatment, and the material and thickness of backing plate of the present invention are not wanted in the table
Within the scope of the heat treatment asked.
This method is by the composition backing on workpiece, then welding equipment reinforcement plate on backing plate (without being directly welded on workpiece)
Workpiece A and workpiece B are linked together in advance, then carry out backing welding between workpiece A and workpiece B, is removed again after the completion of backing welding
The reinforcement plate has the following beneficial effects: since reinforcement plate is welded on backing plate, the welding ring of reinforcement plate and backing plate
Border temperature only needs to guarantee that postwelding is without the repair welding weld seam on backing plate after heat treatment and dismounting reinforcement plate at 0 DEG C or more
Without heat treatment, solve current lacing wire plate welding seams (including remove reinforcement plate after workpiece repair welding weld seam) heat treatment it is at high cost,
Period long problem, that is, solve the problems, such as it is described above 2), achieve and substantially reduce the production cycle and significantly reduce system
Cause this beneficial effect.In addition, due to being not necessarily to the heat treatment (benefit including workpiece after dismounting reinforcement plate after reinforcement plate and welding with backing
Welding line), when so as to avoid heat treatment, the workpiece (workpiece A) of the higher side of heat treatment temperature lower to heat treatment temperature one
Adversely affected caused by the performance of the workpiece (workpiece B) of side, that is, solve the problems, such as it is described above 3).Furthermore due to backing plate
Welding is carried out during workpiece end built-up welding overlay cladding, and the weldering of backing plate and workpiece is completed using the preheating temperature of overlay cladding
It connects, therefore, without individually preheating before backing plate and workpiece welding, makes full use of the preheating temperature of built-up welding, not only ensure that welding with backing
Preceding preheating, also effectively prevents the generation of welding cold cracking between backing plate and workpiece, and has saved independent preheating backing plate
Cost and the period, that is, solve the problems, such as it is described above 1)；Similarly, the post weld heat treatment of backing plate and workpiece is at overlay cladding heat
It is handled together when reason, for being individually heat-treated compared with backing plate, had not only reduced thermal energy cost, but also shorten the production cycle.
The method that the present invention also provides another kinds to weld reinforcement plate between two big workpiece of the heat treatment temperature difference, this method are
The preposition process of butt welding workpiece A and workpiece B, wherein the post weld heat treatment temperature of workpiece A is greater than the post weld heat treatment of workpiece B
The heat treatment temperature section that temperature and the two are not overlapped, comprising the following steps:
S1: the preheating before built-up welding is carried out wait the place of docking to workpiece A and workpiece B, in pair of workpiece A and workpiece B after preheating
Meeting place, built-up welding is Ni-based or the overlay cladding of austenite material, during built-up welding overlay cladding, using the preheating temperature of overlay cladding,
The preparatory composition backing in position of reinforcement plate to be welded on workpiece A；
S2: after the completion of above-mentioned built-up welding and backing plate welding, postwelding heat is carried out to the overlay cladding on workpiece A and workpiece B
Processing, wherein the fillet weld of backing plate and workpiece A is also heat-treated together during being heat-treated to workpiece A；
S3: workpiece A and workpiece B are placed in after docking location, reinforcement plate one end are welded on the backing plate of workpiece A, weldering
It need to guarantee that joint environment temperature is more than or equal to 0 DEG C when connecing；
S4: the other end of reinforcement plate is directly welded on workpiece B, needs to carry out the position to be welded of workpiece B before welding pre-
Heat needs to be heat-treated weld seam after welding；
S5: between workpiece A and workpiece B after the complete all reinforcement plates of welding equipment, in the groove between workpiece A and workpiece B
Carry out backing welding；
S6: after the completion of backing welding, removing the reinforcement plate, and removes on backing plate and remaining weld seam on workpiece B；
S7: when to removing reinforcement plate, the pit formed on backing plate carries out repair welding or polishing, the formation on workpiece B
Pit carries out being polishing to rounding off or repair welding, if on workpiece B pit carry out repair welding, after repair welding to the repair welding weld seam into
Row heat treatment；
The material and thickness of the backing plate are not necessarily to be heat-treated after can guarantee backing plate and reinforcement plate welding, i.e. the material of backing plate
Matter and thickness meet the regulation for exempting post weld heat treatment standard, equally visible GB 150-2011 " pressure vessel " Part IV the
The 8.2.2.1 tables 5 of page 331 need to carry out the welding point thickness of post weld heat treatment, and the material and thickness of backing plate of the present invention do not exist
The table requires in the range of heat treatment.
The beneficial effect of above-mentioned technical proposal is: on workpiece A, since reinforcement plate is welded on backing plate, and reinforcement plate
It only needs to guarantee that postwelding is without backing plate after heat treatment and dismounting reinforcement plate at 0 DEG C or more with the joint environment temperature of backing plate
On repair welding weld seam without heat treatment, i.e., solved on workpiece A current lacing wire plate welding seams (including remove reinforcement plate after workpiece
Repair welding weld seam) heat treatment at high cost, period long problem, that is, problem 2 described above), achieve and shorten production
Period simultaneously significantly reduces the beneficial effect of manufacturing cost.
In addition, though weld preheating, post weld heat treatment are still needed to when welding reinforcement plate on workpiece B, but due to workpiece B's
Post weld heat treatment temperature of the post weld heat treatment temperature less than workpiece A therefore, can't be to work when being heat-treated on workpiece B
The performance of part A adversely affects, that is, solve the problems, such as it is described above 3).Ibid a technical solution is the same, due to backing plate and work
The welding of part is carried out during workpiece end built-up welding overlay cladding, heat treatment again overlay cladding heat treatment when together everywhere
Reason, therefore prevent the generation of welding cold cracking between backing plate and workpiece, reduce thermal energy cost, shorten the production cycle, i.e.,
Solve the problems, such as it is described above 1).
In summary the first and second method, that is to say, that in order to avoid lacing wire plate welding seams are heat-treated in the prior art
When, the performance of workpiece B (the lower workpiece of heat treatment temperature) is adversely affected, in workpiece A (the higher work of heat treatment temperature
Part) on must composition backing, welding or not composition backing may be selected on workpiece B.
In the above described two methods, the backing plate is low-carbon steel material, with a thickness of 6-30mm.The backing plate of the material and drawing
Without preheating before gusset welding, the weld seam (the repair welding weld seam including workpiece after dismounting reinforcement plate) after welding is without heat treatment.
Further, the backing plate with a thickness of 6-15mm.
In the above described two methods, it after completing step S1, need to detect a flaw to the weld dimensions of backing plate.
In the above described two methods, in step S1, most low coverage of the backing plate of welding apart from associated workpiece butting grooves edge
From not less than 20mm.
Further, minimum distance of the backing plate of welding apart from associated workpiece butting grooves edge is 30-150mm.
In the above described two methods, in step S1, minimum distance of the backing plate of welding apart from the overlay cladding edge be not small
In 10mm.
Further, minimum distance of the backing plate of welding apart from the overlay cladding edge is 20-150mm.
In the above described two methods, the reinforcement plate is low-carbon steel material.
In the above described two methods, there is enough pre- fillet weld when the backing plate width and length can guarantee welding reinforcement plate
Spacing is welded on workpiece to avoid weld seam.
Further, the width of backing plate and length are not less than 50mm.
Further, the width and length range of backing plate are as follows: 50-200mm.
In the above described two methods, arrangement spacing of each backing plate on workpiece is determined according to the position of subsequent reinforcement plate.
It should be noted that without dismantling again, that is, forming permanent backing plate after above-mentioned backing plate is welded on workpiece.
In conclusion welding permanent backing plate in advance on workpiece in two methods of the invention, the permanent backing plate is in work
It welds during the built-up welding of part end, is heat-treated together with overlay cladding later, the preheating and heat treatment of backing plate are during overlay cladding
Carry out, can saving heat energy and period and pre- thermal mass avoid the generation of cold crack.Next two workpiece are carried out again
Then reinforcement plate welding equipment is carried out backing welding, removes reinforcement plate again later and beat by group pair before the welding organized pair between two workpiece
It grinds permanent pad surfaces and carries out repair welding to rounding off or to the pit on backing plate, postwelding is no longer carried out to permanent backing plate after repair welding
Heat treatment, due to not preheating before backing plate and reinforcement plate weldering, postwelding is not heat-treated, therefore has not only saved thermal energy and period, but also is avoided
Influence of the high heat treatment temperature workpiece to the performance of low heat-treatment temperature workpiece.
Detailed description of the invention
Fig. 1 is the schematic diagram that currently used prewelding reinforcement plate connects two workpiece；
Fig. 2 is the schematic diagram that reinforcement plate welds in embodiment 1；
Fig. 3 is the schematic diagram that reinforcement plate welds in embodiment 2；
In the figure, it is marked as 1- workpiece A, 2- workpiece B, 3- reinforcement plate, 4- turning rolls, 5- superheat section shell ring, 6- tube sheet, 7- nickel
Base overlay cladding, 8- backing plate.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below, but embodiments of the present invention are not limited to
This.
By taking certain high-pressure heater as an example, in the high-pressure heater, the material of height plus superheat section shell ring 5 is 12Cr2Mo1VR,
Wall thickness is 88mm；The material of tube sheet 6 be IV forging of 20MnMoNb, docking location with a thickness of 88mm, product is needed superheat section
Shell ring 5 is docked with tube sheet 6.Because the heat treatment temperature difference of IV forging of 12Cr2Mo1VR and 20MnMoNb is larger, if directly
It can not be directly heat-treated after docking, then require the Ni-based overlay cladding of first built-up welding in the end of superheat section shell ring 5 and tube sheet 6
7, the two docking is got up again after being heat-treated respectively, does not have to be heat-treated again after docking.
Preparatory welding equipment reinforcement plate 3 (material is mild steel) is needed in docking operation, then carries out backing welding therebetween, it should
The welding of reinforcement plate 3 is i.e. using the method for this patent, and the material of used backing plate 8 is mild steel, with a thickness of 20mm.
Embodiment 1:
This approach includes the following steps；
S1: it needs to weld the position scribing line of reinforcement plate 3 on superheat section shell ring 5 and tube sheet 6, marks；
S2: the groove surface build-up welding Ni-based overlay cladding 7 in 5 end of superheat section shell ring needs before first layer built-up welding to superheat section
Shell ring 5 is preheated to heap welding zone and surrounding, and after heap is soldered first layer, the temperature of 5 end of superheat section shell ring is higher, reaches completely
The preheating temperature needed to the welding of backing plate 8, the welding of mark progress backing plate 8 in step sl at this time, in superheat section after welding
Permanent backing plate 8 is formed on shell ring 5, entire Ni-based overlay cladding 7 is completed in built-up welding on superheat section shell ring 5 later；
S3: 100%MT flaw detection is carried out to the fillet weld of the backing plate 8；
S4: after flaw detection is qualified, post weld heat treatment is carried out to the Ni-based overlay cladding 7 of superheat section shell ring 5, while together to thereon
The fillet weld of backing plate 8 be also heat-treated；
S5: to being preheated to heap welding zone and surrounding for 6 end of tube sheet, in the Ni-based overlay cladding of bevel end surface build-up welding after preheating
7, post weld heat treatment is carried out to Ni-based overlay cladding 7 after the completion；
S6: superheat section shell ring 5 and tube sheet 6 are placed in docking location, and one end of reinforcement plate 3 is welded on superheat section shell ring
On 5 backing plate 8, the other end is directly welded on tube sheet 6 (as shown in Figure 2)；It only needs to guarantee ring when welding reinforcement plate on backing plate 8
Border temperature is more than or equal to 0 DEG C, and without preheating before weldering, postwelding is without heat treatment；It is needed when welding reinforcement plate 3 on tube sheet 6
The place to be welded of tube sheet 6 is preheated in advance, postwelding also needs to be heat-treated weld seam；
S7: after reinforcement plate 3 is welded, backing welding is carried out between superheat section shell ring 5 and tube sheet 6, backing welding is with a thickness of 10-
20mm；
S8: removing reinforcement plate 3, and removes and remain on the remaining weld seam and tube sheet 6 on the backing plate 8 of superheat section shell ring 5
Weld seam；
S9: due to that can leave pit in backing plate 8 and 6 surface of tube sheet when removing reinforcement plate 3 in step S8, this step is to backing plate
8 surface craters carry out repair welding or are polishing to rounding off, without being heat-treated after repair welding or polishing；To the recessed of 6 surface of tube sheet
Hole carries out repair welding, needs to be heat-treated repair welding weld seam after repair welding.
In the above method, need to guarantee distance of the backing plate 8 apart from 5 bevelled edge of superheat section shell ring not less than 20mm, backing plate 8 away from
It is not less than 10mm with a distance from Ni-based 7 edge of overlay cladding.
Embodiment 2:
This approach includes the following steps；
S1: it needs to weld the position scribing line of reinforcement plate 3 on superheat section shell ring 5 and tube sheet 6, marks；
S2: the groove surface build-up welding Ni-based overlay cladding 7 in 5 end of superheat section shell ring needs before first layer built-up welding to superheat section
Shell ring 5 is preheated to heap welding zone and surrounding, and after heap is soldered first layer, the temperature of 5 end of superheat section shell ring is higher, reaches completely
The preheating temperature needed to the welding of backing plate 8, the welding of mark progress backing plate 8 in step sl at this time, in superheat section after welding
Permanent backing plate 8 is formed on shell ring 5, entire Ni-based overlay cladding 7 is completed in built-up welding on superheat section shell ring 5 later；
S3: 100%MT flaw detection is carried out to the fillet weld of the permanent backing plate 8；
S4: after flaw detection is qualified, post weld heat treatment is carried out to the Ni-based overlay cladding 7 of superheat section shell ring 5, while together to thereon
The fillet weld of permanent backing plate 8 be also heat-treated；
S5: to being preheated to heap welding zone and surrounding for 6 end of tube sheet, in the Ni-based overlay cladding of bevel end surface build-up welding after preheating
7, backing plate 8 is welded on the mark of tube sheet 6 using the preheating temperature afterwards in place, forms permanent pad after welding on tube sheet 6
Plate 8, entire Ni-based overlay cladding 7 is completed in built-up welding on tube sheet 6 later；
S6: 100%MT flaw detection is carried out to the fillet weld of the backing plate 8；
S7: after flaw detection is qualified, post weld heat treatment is carried out to the Ni-based overlay cladding 7 of tube sheet 6, while together to backing plate thereon
8 fillet weld is also heat-treated；
S5: superheat section shell ring 5 and tube sheet 6 are placed in docking location, and one end of reinforcement plate 3 is welded on superheat section shell ring
On 5 backing plate 8, the other end is welded on the backing plate 8 of tube sheet 6 (as shown in Figure 3), and when welding need to guarantee that environment temperature is more than or equal to
0 DEG C, without preheating before weldering, postwelding is without being heat-treated；
S6: after reinforcement plate 3 is welded, backing welding is carried out between superheat section shell ring 5 and tube sheet 6, backing welding is with a thickness of 10-
20mm；
S7: removing reinforcement plate 3, and removes remaining weld seam on the backing plate 8 of superheat section shell ring 5 and tube sheet 6；
S8: due to that can leave pit on 8 surface of backing plate when removing reinforcement plate 3 in step S7, this step is recessed to 8 surface of backing plate
Hole carries out repair welding or is polishing to rounding off, without being heat-treated after repair welding or polishing.
In the above method, it need to guarantee that distance of the backing plate 8 apart from 6 bevelled edge of superheat section shell ring 5 or tube sheet is not less than 20mm,
Distance of the backing plate 8 apart from Ni-based 7 edge of overlay cladding is not less than 10mm.
In embodiment 1 and embodiment 2, due to increasing the permanent backing plate for welding reinforcement plate on workpiece, due to forever
The material of long backing plate is mild steel, and the material of reinforcement plate is also mild steel, therefore without pre- when reinforcement plate and the welding of permanent backing plate
Heat, lacing wire plate welding seams (the repair welding weld seam including workpiece after dismounting reinforcement plate) are solved without heat treatment due to superheat section cylinder
It is much larger compared with tube sheet to save heat treatment temperature, after leading to welding equipment reinforcement plate, when being heat-treated on superheat section shell ring to lacing wire plate welding seams
The problem of tube sheet performance being impacted, and also substantially reduced without preheating, postwelding without heat treatment before reinforcement plate weldering
Production cycle significantly reduces manufacturing cost.In addition, since the welding of backing plate is carried out during the Ni-based layer of workpiece end built-up welding
, post weld heat treatment is also to carry out together with overlay cladding heat treatment, takes full advantage of the preheating temperature of the Ni-based layer of built-up welding, not only
Preheating temperature before ensure that welding with backing, effectively prevents the generation of cold crack, and thermal energy cost and life is greatly saved
Produce the period.
Claims (9)
1. the method for welding reinforcement plate between two big workpiece of the heat treatment temperature difference, this method are butt welding workpiece A's and workpiece B
Preposition process, wherein the post weld heat treatment temperature of workpiece A is greater than the post weld heat treatment temperature of workpiece B, and the two is not overlapped
Heat treatment temperature section, which comprises the following steps:
S1: the preheating before built-up welding is carried out wait the place of docking to workpiece A and workpiece B, after preheating at the docking of workpiece A and workpiece B
Built-up welding is Ni-based or the overlay cladding of austenite material, during built-up welding overlay cladding, using the preheating temperature of overlay cladding, in workpiece
The preparatory composition backing in position of reinforcement plate to be welded on A and workpiece B；
S2: after the completion of above-mentioned built-up welding and backing plate welding, carrying out post weld heat treatment to the overlay cladding on workpiece A and workpiece B,
During the heat treatment, the fillet weld of backing plate and workpiece is also heat-treated together；
S3: workpiece A and workpiece B are placed in after docking location, reinforcement plate one end are welded on the backing plate of workpiece A, the other end
It is welded on the backing plate of workpiece B, when welding need to guarantee that joint environment temperature is more than or equal to 0 DEG C；
S4: it between workpiece A and workpiece B after the complete all reinforcement plates of welding equipment, is carried out in the groove between workpiece A and workpiece B
Backing welding；
S5: after the completion of backing welding, the reinforcement plate is removed, and remove remaining weld seam on backing plate；
S6: repair welding or polishing are carried out to the pit formed on backing plate when removing reinforcement plate；
The material and thickness of the backing plate are not necessarily to be heat-treated after can guarantee backing plate and reinforcement plate welding.
2. the method for welding reinforcement plate between two big workpiece of the heat treatment temperature difference, this method are butt welding workpiece A's and workpiece B
Preposition process, the heat that wherein post weld heat treatment temperature of the post weld heat treatment temperature of workpiece A greater than workpiece B and the two are not overlapped
Treatment temperature section, which comprises the following steps:
S1: the preheating before built-up welding is carried out wait the place of docking to workpiece A and workpiece B, after preheating at the docking of workpiece A and workpiece B
Built-up welding is Ni-based or the overlay cladding of austenite material, during built-up welding overlay cladding, using the preheating temperature of overlay cladding, in workpiece
The preparatory composition backing in position of the upper reinforcement plate to be welded of A；
S2: after the completion of above-mentioned built-up welding and backing plate welding, carrying out post weld heat treatment to the overlay cladding on workpiece A and workpiece B,
Wherein during being heat-treated to workpiece A, the fillet weld of backing plate and workpiece A is also heat-treated together；
S3: workpiece A and workpiece B are placed in after docking location, reinforcement plate one end are welded on the backing plate of workpiece A, when welding
It need to guarantee that joint environment temperature is more than or equal to 0 DEG C；
S4: the other end of reinforcement plate is directly welded on workpiece B, needs to preheat the position to be welded of workpiece B before welding, weldering
It needs to be heat-treated weld seam after connecing；
S5: it between workpiece A and workpiece B after the complete all reinforcement plates of welding equipment, is carried out in the groove between workpiece A and workpiece B
Backing welding；
S6: after the completion of backing welding, removing the reinforcement plate, and removes on backing plate and remaining weld seam on workpiece B；
S7: when to removing reinforcement plate, the pit formed on backing plate carries out repair welding or polishing, the pit of the formation on workpiece B
It carries out being polishing to rounding off or repair welding, if carrying out repair welding to the pit on workpiece B, heat is carried out to the repair welding weld seam after repair welding
Processing；
The material and thickness of the backing plate are not necessarily to be heat-treated after can guarantee backing plate and reinforcement plate welding.
3. the method for welding reinforcement plate between two workpiece big in the heat treatment temperature difference according to claim 1 or 2, feature exist
In: the backing plate is low-carbon steel material, with a thickness of 6-30mm.
4. welding the method for reinforcement plate between two workpiece big in the heat treatment temperature difference according to claim 3, it is characterised in that:
The backing plate with a thickness of 6-15mm.
5. the method for welding reinforcement plate between two workpiece big in the heat treatment temperature difference according to claim 1 or 2, feature exist
In: after completing step S1, detect a flaw to the weld dimensions of backing plate and workpiece.
6. the method for welding reinforcement plate between two workpiece big in the heat treatment temperature difference according to claim 1 or 2, feature exist
In: in step S1, minimum distance of the backing plate of welding apart from associated workpiece butting grooves edge is not less than 20mm.
7. welding the method for reinforcement plate between two workpiece big in the heat treatment temperature difference according to claim 6, it is characterised in that:
Minimum distance of the backing plate of welding apart from associated workpiece butting grooves edge is 30-150mm.
8. the method for welding reinforcement plate between two workpiece big in the heat treatment temperature difference according to claim 1 or 2, feature exist
In: in step S1, minimum distance of the backing plate of welding apart from the overlay cladding edge is not less than 10mm.
9. welding the method for reinforcement plate between two workpiece big in the heat treatment temperature difference according to claim 8, it is characterised in that:
Minimum distance of the backing plate of welding apart from the overlay cladding edge is 20-150mm.
Priority Applications (1)
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