CN101927396A - Method for welding steel plate by multi-layer welding - Google Patents
Method for welding steel plate by multi-layer welding Download PDFInfo
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Abstract
The invention discloses a method for welding a steel plate by multi-layer welding. The method comprises priming welding, filling welding and cosmetic welding, wherein the cosmetic welding comprises the steps of respectively performing first pass welding and second pass welding on the surfaces of two steel plates to be welded so as to form a first-pass weld pass and a second-pass weld pass, then performing third pass welding on the first-pass weld pass and the second-pass weld pass to form a third-pass weld pass connecting the first-pass weld pass and the second-pass weld pass. The method for welding the steel plate by multi-layer welding can play the role of slowing down the cooling of the first-pass weld pass and the second-pass weld pass through the third-pass weld pass, and simultaneously, normalizing is carried out on welding points. After being austenitized, the steel plate tissues in a heat affected zone and a fusion zone slowly cool down, so that the welding points form pearlite tissues with fine pearlites, thereby improving the mechanical properties of the welding points such as toughness and the like.
Description
Technical field
The present invention relates to a kind of method of welding steel plate by multi-layer welding.
Background technology
During welding, the heat of high temperature of molten solder material is concentrated, thereby makes the workpiece metal fusing that contact with welding material and engage formation weld seam and welding point with welding material under molten state.Whole welding joints is made of weld seam, fusion area, heat affected area.Wherein, weld seam melts when welding fully; Does not melt when welding the heat affected area; The fusion area is the transitional region (weld seam and heat affected area are as shown in Figure 1) between weld seam and heat affected area.In the combination, weld seam is to workpiece metal (mother metal) B1 and B2 conduction heat under molten state for welding material and base metals.This metal structure that causes weld seam and heat affected area changes.Because each point is different with the distance at weld seam center on weld seam and the heat affected area, suffered maximum heating temperature difference, therefore welding is equivalent to whole welding joints has been carried out the heat treatment of a different specification, and each position of welding point different tissues can occur and change and performance variation.
Metal works is under the effect of Thermal Cycle, and the Tissue distribution of heat affected area is uneven.When using welding steel plate by multi-layer welding, in bottoming welding and the filling welding operation, when welding adjacent two welding beads (or layer), because the temperature difference between adjacent two welding beads is the effect of interlayer temperature, after welding operation welding point cooling velocity that the welding operation by is formerly obtained slow down, promptly the welding point that welding operation is formerly obtained has played the effect of normalizing.Thereby the steel plate materials of heat affected area is recrystallized fully, and the cooling back is even and tiny normalized structure, and the mechanical performance of welding point is obviously improved.When carrying out cover welding at last, can not carry out normalized treatment to the weld seam and the welding point of cover welding because there is follow-up welding effect, so it is very fast that the fusion area of the welding point that cover welding obtains and heat affected area are heated the back cooling velocity, form bainite even martensitic structure easily, reduce plasticity and toughness greatly.When the bainite of fusion area and heat affected area or martensitic structure are too much, can not satisfy normal use, not reach for example regulation of GB/T 2653-2008 (welding point bend test method) of national standard.
In addition, the steel that alloying elements is more, along with alloying element adds, carbon equivalent raises, and causes the continuous cooling curve (CCT curve) of steel plate to move to right.Because the cooling velocity of welding point is very fast during cover welding, fusion area and heat affected area be easier the tissue that bainite etc. reduces welding point plasticity to occur.For example, in high-strength weather resisting steel (weathering steel) plate, added a large amount of alloying elements, as elements such as Cr, Cu, Ni, Mn.After adopting the welding of traditional multilayer welding, form a large amount of bainite structure (account for greatly heat affected area 20%) in the welding point, and the weld metal zone forms the column crystal that is similar to as-cast structure.According to GBT 2653-2008 this welding point is carried out bend test, welding point ftractures when normal bend test easily, and crack length is greater than the 3mm of GB/T 2653-2008 regulation, and just welding point is defective.
Therefore, in the prior art, when adopting welding steel plate by multi-layer welding, particularly during the higher steel plate of welding alloy composition height and mechanical property requirements, be difficult to avoid to produce in the fusion area of welding point and heat affected area bainite etc. and reduce the tissue of plasticity, the mechanical property of welding point does not reach the regulation of national standard.
Summary of the invention
In order to improve the mechanical property of the welding point that welding steel plate by multi-layer welding forms, avoid producing the tissue that bainite etc. reduces plasticity in the heat affected area, the invention provides a kind of method of welding steel plate by multi-layer welding.
The method of welding steel plate by multi-layer welding of the present invention comprises the bottoming welding, fills welding and cover welding, wherein, described cover welding comprises carries out the welding of first passage, the welding of second passage respectively on the surface of two steel plates to be welded, thereby form the first passage welding bead and the second passage welding bead respectively, and then on described first passage welding bead and the described second passage welding bead, carry out the welding of the 3rd passage, form the 3rd passage welding bead that connects described first passage welding bead and the described second passage welding bead.
The method of welding steel plate by multi-layer welding of the present invention plays the effect that slows down the first passage welding bead and the cooling of the second passage welding bead by described the 3rd passage welding, simultaneously, welding point has been carried out normalized treatment.The steel plate of heat affected area and fusion area can not be as cold as bainite district even martensitic regions because of cooling off fast after organizing austenitizing, and the tissue of welding point is a normalized structure, i.e. the pearlitic structrure of grain refinement.In addition, described cover welding comprises three passage welding, and described the 3rd passage welding bead is between the described first passage welding bead and the second passage welding bead, just weld seam column crystal weak link moved on to the centre of welding point and dwindled the scope of this weak link.Therefore, use the method for welding steel plate by multi-layer welding of the present invention, can eliminate bainite structure basically, improve the toughness of welding point, the requirement that the just curved performance of welding point is up to state standards.
Description of drawings
Fig. 1 shows the weld metal zone of welding point and the schematic diagram of heat affected area;
Fig. 2 is the schematic diagram of welding point when show using a kind of embodiment welding steel of method of welding steel plate by multi-layer welding of the present invention.
The specific embodiment
The method of welding steel plate by multi-layer welding of the present invention comprises the bottoming welding, fills welding and cover welding, wherein, described cover welding comprises carries out the welding of first passage, the welding of second passage respectively on the surface of two steel plates to be welded, thereby form the first passage welding bead and the second passage welding bead respectively, and then on described first passage welding bead and the described second passage welding bead, carry out the welding of the 3rd passage, form the 3rd passage welding bead that connects described first passage welding bead and the described second passage welding bead.
The surface of described two steel plates to be welded can be the surface of the breach on the same block plate or the groove face of the groove that two blocks of steel plates to be welded form.
The first passage welding bead and the second passage welding bead that described first passage welding and the welding of second passage are formed by described the 3rd passage welding slowly cool off, simultaneously, welding point is played positive fire action, the organizing basically of welding point of using multilayer welding welding method of the present invention to obtain is made up of pearlite and ferrite, can occur the tissue that bainite etc. reduces steel plate plasticity hardly, thereby can significantly improve the just curved performance of welding point and meet the regulation of national standard.
In addition, by described the 3rd passage welding the part of not accepting normalized treatment on the welding point is moved on to described the 3rd passage welding bead, thereby dwindled the scope of this weak link.
In order further to improve the positive fire action of described the 3rd passage welding, preferably, when carrying out described the 3rd passage welding, interlayer temperature is 180-200 ℃.That is to say, when the temperature of the described first passage welding bead and the second passage welding bead is reduced to 180-200 ℃, carry out described the 3rd passage welding.In this interlayer temperature scope, can make welding point with the cooling of suitable speed, avoid cooling velocity too fast and the relatively poor tissues of plasticity such as bainite or martensite occur, just can maximally utilise the positive fire action of described the 3rd passage welding.
In addition, fusion area and heat affected area that described the 3rd passage welding produces the described first passage welding bead and the second passage welding bead are the middle skew of described welding point towards described the 3rd passage welding bead, thereby the positive fire action that has made full use of the welding of the 3rd passage makes also slowly cooling of fusion area, the crystal grain of whole welding joints is fined, thereby can either improve tensile strength, also can improve toughness, plasticity.
When carrying out described bottoming welding and filling welding, interlayer temperature can be to well known to a person skilled in the art numerical value commonly used, for example 100-150 ℃.This interlayer temperature can guarantee that each the passage welding point before the described cover welding obtains suitable cooling velocity.
Described cover welding at least welding steel thickness 1/8, thereby when whole welding joints is played positive fire action, can reduce the heat input of cover welding, thereby the weld metal zone that guarantees welding point can not form the thick column crystal of too many crystal grain, crystal grain that can also the refinement heat affected area further improves the mechanical property of described welding point.Because described cover welding will be welded to the front (upper surface of Fig. 2 light plate B1 and B2) of steel plate at least, so carry out before the described cover welding, should guarantee that the distance along thickness direction is at least 1/8 of steel plate thickness between the front of deposited metal and steel plate, be preferably 1/8-1/6.
The thickness of the first passage welding bead that described cover welding obtains, the second passage welding bead and the 3rd passage welding bead is preferably basic identical, and this thickness is preferably the 1/8-1/6 of the thickness of steel plate to be welded.Promptly by the described cover welding 1/8-1/6 of welding steel thickness at least.
As mentioned above, the thickness of described cover welding deposited metal is the 1/8-1/6 of the thickness of steel plate to be welded.In addition, described bottoming welding can be welded for a time, and the thickness that backing welding is connect deposited metal is not particularly limited, and needs only through welding steel plate, back-welding shape, and the thickness of the metal that described bottoming welding is deposited is generally the 1/8-1/6 of the thickness of steel plate to be welded.
And described filling welding can comprise the multi-pass welding, specifically can select the quantity of welding passage according to the thickness of steel plate.Because thickness of every time welding deposited metal depends on welding method and the welding material specification that is adopted to a great extent, therefore, when the thickness of steel plate to be welded is big, can increase the thickness of deposited metal by increasing the passage of filling welding.Under the preferable case, the gross thickness of described filling weld(ing) deposit can be the 3/4-5/6 of the thickness of steel plate to be welded.
Because described bottoming welding is meeting through welding steel plate generally, therefore deposited metal can flow to the back side of steel plate.In addition, after described cover welding was finished, deposited metal will reach the thickness that is welded to steel plate at least.Therefore, whole welding joints runs through the thickness of steel plate, may be a bit larger tham the thickness of steel plate by described bottoming welding, filling welding and cover welding deposited metal.Preferably, the difference of the gross thickness of deposited metal and the thickness of steel plate is 0-2.5mm, more preferably 0.1-2.5mm.
When using multilayer welding welding method of the present invention, can on two steel plates to be welded, leave various types of grooves, for example make the surface of two steel plates to be welded form V-butt or U-shaped groove.The groove face of described groove is needs the surface of welding on the steel plate to be welded, described first passage welding and second passage are welded two groove faces that weld described groove separately.
In one embodiment of the invention, adopt the method for one side welding with back formation.In this case, preferably make two steel plates to be welded form V-butt.Owing to used the method for one side welding with back formation, carry out described bottoming welding along the bottom of V-butt from the one side of steel plate to be welded and can make the complete penetration of described welding point, and deposited mobile metal can be by the another side of steel plate to be welded restriction, thereby described welding point is shaped better.When carrying out described cover welding, two groove faces of described V-butt are welded in described first passage welding and the welding of second passage separately, i.e. the surface of the described V-butt of formation on the steel plate.The bevel angle of described V-butt is preferably the 45-60 degree, and the group of described steel plate is preferably 2-3mm to the gap.Described bevel angle is meant the angle between the welding surface of two steel plates, and described group was meant before carrying out described bottoming welding minimum clearance between two steel plates to be welded to the gap, i.e. distance between the lower surface of two steel plate B1 to be welded and B2 among Fig. 2.
During welding, the welding material that uses when described bottoming welding and filling welding can be same kind of welding material, and the welding material that welding material that described cover welding is used and described bottoming welding and filling welding are used can be identical or different.The principle of choosing welding material is known, and promptly the composition of weld(ing) deposit and welding back mechanical property similar to the composition of steel plate to be welded is similar to steel plate to be welded.
Below by using method welded high-strength atmospheric corrosion resistance steel plate explanation one embodiment of the present invention of the present invention.In the present embodiment, steel plate B1 and B2 all are that thickness h is the Q450NQR1 steel plate of 12mm, and the original structure of steel plate is pearlite and ferrite; It is the MAG weldering that described bottoming welding, filling welding and the cover welding of multilayer welding welding are metal active gas welding, and protective gas is Ar and the 10-30 volume %CO of 70-90 volume %
2Mist.Wherein, the welding current of described bottoming welding is 90-120A, and weldingvoltage is 18-20V, and gas flow is 10-20L/min, preferred 15-18L/min; The welding current of described filling welding and described cover welding is 160-220A, and weldingvoltage is 20-22V, and gas flow is 15-25L/min, preferred 16-20/min.Certainly, also can adopt other welding method, for example MIG weldering or other fusion welding method.
According to the thickness of steel plate, in the present embodiment, described filling welding comprises the welding of 3 passages, and therefore, as shown in Figure 2, in this embodiment, multilayer welding welding of the present invention comprises the welding of 7 passages altogether.Hereinafter, for ease of explanation, with described bottoming welding, filling welding and cover welding serial number, be that described bottoming is welded as the S1 welding, described filling welding comprises that S2 to S4 welds, and first passage welding of described cover welding, the welding of second passage and the 3rd passage are welded the S5 welding of respectively doing for oneself, S6 welding and S7 welding.S5 welding and S6 welding are welded the groove face of the V-butt on two steel plate B1 and the B2 separately and are formed the S5 welding bead and the S6 welding bead, and the S5 welding bead is connected by the S7 welding bead that the S7 welding forms with the S6 welding bead.
During welding, the interlayer temperature of S1-S6 welding is 100-150 ℃, and during welding S7 welding bead, interlayer temperature preferably is controlled at 180-200 ℃.Wherein, the measuring method of interlayer temperature has been conventionally known to one of skill in the art, i.e. the temperature of the surface of steel plate at 50mm place, measuring distance weld seam center.Wherein, described weld seam center is parallel to the width of steel plate to be welded and passes the center line of the upper end open of groove, can obtain interlayer temperature by the temperature of measuring length direction along steel plate to be welded (be among Fig. 2 to the left or to the right) steel plate B1 at distance 50mm place, described weld seam center and the upper surface of B2.Interlayer temperature can be measured by various temperature measuring devices, for example, can use temperature measurer (SKW-2) to measure interlayer temperature.That is to say, when using temperature measurer to measure interlayer temperature, carry out the S7 welding as 180-200 ℃.In addition, during S1 welding (i.e. bottoming welding), 90-120A, weldingvoltage are 18-20V, and protective gas is Ar and the 10-30 volume %CO of 70-90 volume %
2Mist, gas flow is 10-20L/min, preferred 15-18L/min; During S2-S7 welding (promptly filling welding and cover welding), welding current is 160-220A, and weldingvoltage is 20-22V, and protective gas is Ar and the 10-30 volume %CO of 70-90 volume %
2Mist, gas flow is 15-25L/min, preferred 16-20/min.
Preferably, be that the thickness of the deposited metal of described bottoming welding is 1.5-2mm by S1 welding; The thickness of every time deposited metal is 2-3.5mm in the S2-S4 welding; The thickness that welds deposited metal by S5, S6 and S7 is basic identical, is 1.5-2mm.
In addition, it can be with a kind of welding material that S 1-S7 welds employed welding material, TH550-NQ-A for example, composition (quality %) is C 0.06, Si 0.37, Mn 1.30, P 0.014, S 0.009, Cu 0.34, Cr 0.34, Ni 0.52, welding wire specification Φ 1.2mm, the tissue that the composition of described welding material and welding back form is similar to the Q450NQR1 steel plate.
Embodiment
Below, further specify the present invention with reference to the embodiment that the Q450NQR1 steel plate is carried out the multilayer welding welding.
Adopt multilayer welding welding sequence shown in Figure 2 to use MAG weldering that thickness is carried out the multilayer welding welding as the Q450NQR1 steel plate of 12mm, the protective gas of MAG weldering is Ar80%+20%CO
2(volume fraction); Steel plate has V-butt; Adopt the mode of one side welding with back formation to weld.The alloying component of Q450NQR1 steel plate (the content unit of each alloying element is weight %) as shown in table 1; S1-S7 uses with a kind of welding material TH550-NQ-A, and composition (quality %) is C 0.06, Si 0.37, Mn 1.30, P 0.014, S 0.009, Cu 0.34, Cr 0.34, Ni 0.52, welding wire specification Φ 1.2mm; The thickness of the metal that the technological parameter of MAG weldering and each passage are deposited is as shown in table 2.Wherein, the interlayer temperature of S1-S6 welding is 100 ℃, and the interlayer temperature of S7 welding is 180 ℃.The bevel angle of the V-butt of two blocks of Q450NQR1 steel plates is 45 °, and group is 2.2mm to the gap.
Table 1
| Numbering/composition | C | Si | Mn | P | S | Cu | Cr | Ni | Nb |
| |
0.07 | 0.39 | 0.9 | 0.014 | 0.005 | 0.25 | 0.52 | 0.21 | 0.025 |
| |
0.06 | 0.33 | 0.85 | 0.015 | 0.004 | 0.26 | 0.51 | 0.22 | 0.023 |
| Embodiment 3 | 0.06 | 0.31 | 0.91 | 0.016 | 0.005 | 0.24 | 0.51 | 0.21 | 0.021 |
| Comparative Examples 1 | 0.07 | 0.39 | 0.9 | 0.014 | 0.005 | 0.25 | 0.52 | 0.21 | 0.025 |
Table 2
| Passage | Welding current (A) | Weldingvoltage (V) | Gas flow (L/min) | Deposited thickness (mm) |
| S?1 | 90 | 18 | 16 | 1.5 |
| S2 | 160 | 20 | 18 | 2.5 |
| S3 | 200 | 22 | 18 | 3.5 |
| S4 | 220 | 22 | 18 | 3.5 |
| S5 | 160 | 20 | 18 | 2 |
| S6 | 160 | 20 | 18 | 2 |
| S7 | 160 | 20 | 18 | 2 |
Wherein, the gross thickness of (promptly finishing described filling and weld the back) deposited metal after S4 welds is 11mm.Vertical range between the upper surface of S4 welding bead and steel plate (along the distance of steel plate thickness direction) may be less than 1.5mm.In this case, use grinding apparatus for example angle grinding machine (model is 125MMG13SR) the S4 welding bead is polished, make the vertical range between the upper surface of S4 welding bead and steel plate B1 and B2 be 1.5mm at least.
Method throat thickness according to embodiment 1 is the Q450NQR1 steel plate of 12mm, different is, the alloying component of the Q450NQR1 steel plate that uses is as shown in table 1, the thickness of the metal that the technological parameter of MAG weldering and each passage are deposited is as shown in table 3, the interlayer temperature of S1-S6 is 120 ℃, and the interlayer temperature during the S7 welding is 190 ℃.
Table 3
| Passage | Welding current (A) | Weldingvoltage (V) | Gas flow (L/min) | Deposited thickness (mm) |
| S1 | 100 | 20 | 16 | 1.8 |
| S2 | 160 | 20 | 18 | 3 |
| S3 | 200 | 22 | 18 | 3.5 |
| S4 | 200 | 22 | 18 | 3.5 |
| S5 | 180 | 20 | 18 | 2.5 |
| S6 | 200 | 21 | 18 | 2.5 |
| S7 | 160 | 20 | 18 | 2 |
Method throat thickness according to embodiment 2 is the Q450NQR1 steel plate of 12mm, different is, the alloying component of the Q450NQR1 steel plate that uses is as shown in table 1, the thickness of the metal that the technological parameter of MAG weldering and each passage are deposited is as shown in table 4, the interlayer temperature of S1-S6 is 150 ℃, interlayer temperature during the S7 welding is 200 ℃, and the bevel angle of the V-butt of two blocks of Q450NQR1 steel plates is 60 °.
Table 4
| Passage | Welding current (A) | Weldingvoltage (V) | Gas flow (L/min) | Deposited thickness (mm) |
| S1 | 120 | 20 | 16 | 2 |
| S2 | 160 | 20 | 18 | 3 |
| S3 | 200 | 22 | 18 | 3.5 |
| S4 | 200 | 22 | 18 | 3.5 |
| S5 | 220 | 22 | 18 | 2.5 |
| S6 | 220 | 22 | 18 | 2.5 |
| S7 | 160 | 20 | 18 | 2.5 |
Embodiment 4
Method throat thickness according to embodiment 1 is the Q450NQR1 steel plate of 12mm, and different is that the interlayer temperature during the S7 welding is 150 ℃.
Comparative Examples 1
Is that 12 millimeters Q450NQR1 steel plate carries out the multilayer welding welding according to the method for embodiment 3 to thickness, and different is, cover welding is a time welding, and deposited thickness is 2.5mm.
Metallographic structure analysis is carried out in heat affected area to the welding point of embodiment 1-4 and Comparative Examples 1, finds that organize medium pearlite and the ferritic total amount of embodiment 1-4 is 100 volume %, and bainite accounts for 0 volume %, and grain size number is the 10-10.5 level; The organize medium pearlite and the ferritic total amount of Comparative Examples 1 account for 80 volume %, and bainite accounts for 20 volume %, and grain size is 9 grades.As seen, embodiment 1-4 has avoided the formation of tissues such as bainite effectively, and refinement crystal grain.In addition, in order to find out above-mentioned conclusion more intuitively, " welding point bend test method GB/T 2653-2008 " tests embodiment 1-4 and Comparative Examples 1 according to national standard.Table 5 is the main mechanical property parameters after the test, can further specify above-mentioned conclusion.Wherein, each sample is all placed 48 hours with cooling and timeliness after welding is finished.In the table 5 ,-40 ℃ of Akv are that welding point carries out the ballistic work that the low-temperature impact toughness test records at-40 ℃; Rm is the tensile strength of welding point.
Table 5
As shown in table 5, all less than cracking, and the sample of Comparative Examples 1 not only ftractures the sample of embodiment 1-4 after normal bend test, and crackle belongs to substandard product greater than the 3mm of GB regulation.In addition, the low-temperature impact toughness of embodiment 1-4 obviously is better than Comparative Examples 1.
This shows, use the method for welding steel plate by multi-layer welding of the present invention, can eliminate the relatively poor tissues of plasticity such as bainite effectively, and refinement the crystal grain of welding point, the regulation that welding point is up to state standards has improved the comprehensive mechanical property of welding point greatly.
Claims (13)
1. the method for a welding steel plate by multi-layer welding, this method comprises the bottoming welding, fills welding and cover welding, it is characterized in that, described cover welding comprises carries out the welding of first passage, the welding of second passage respectively on the surface of two steel plates to be welded, thereby form the first passage welding bead and the second passage welding bead respectively, and then on described first passage welding bead and the described second passage welding bead, carry out the welding of the 3rd passage, form the 3rd passage welding bead that connects described first passage welding bead and the described second passage welding bead.
2. method according to claim 1, wherein, the condition of described the 3rd passage welding comprises that interlayer temperature is 180-200 ℃.
3. method according to claim 2, wherein, the interlayer temperature of described bottoming welding and filling welding is 100-150 ℃.
4. according to any described method among the claim 1-3, wherein, the thickness of the metal that described cover welding is deposited is the 1/8-1/6 of steel plate thickness.
5. method according to claim 4, wherein, the thickness of the metal that described bottoming welding is deposited is the 1/8-1/6 of steel plate thickness, and the gross thickness of the metal that described multilayer welding welding is deposited is more than or equal to the thickness of steel plate, and the difference of the gross thickness of the metal that described multilayer welding welding is deposited and the thickness of steel plate to be welded is 0-2.5mm.
6. method according to claim 5, wherein, described steel plate to be welded is the high-strength weather resisting steel steel plate.
7. method according to claim 6, wherein, described high-strength weather resisting steel is Q450NQR1, and steel plate thickness is 10-15mm, the thickness of the metal that described bottoming welding is deposited is 1.5-2mm, and the thickness of the metal that described cover welding is deposited is 1.5-2mmmm.
8. method according to claim 7, wherein, described filling welding comprises the multi-pass welding, the thickness of the metal that every time welding is deposited is 2-3.5mm.
9. according to any described method among claim 1-3 and the 5-8, wherein, described bottoming welding, filling welding are used identical welding material with cover welding.
10. method according to claim 9, wherein, described bottoming welding, filling welding and cover welding are metal active gas welding.
11. method according to claim 10, wherein, the welding current of described bottoming welding is 90-120A, and weldingvoltage is 18-20V, and protective gas is Ar and the 10-30 volume %CO of 70-90 volume %
2Mist, gas flow is 10-20L/min; The welding current of described filling welding and described cover welding is 160-220A, and weldingvoltage is 20-22V, and protective gas is Ar and the 10-30 volume %CO of 70-90 volume %
2Mist, gas flow is 15-25L/min.
12. according to any described method among the claim 1-3, wherein, the mode of described multilayer welding welding is the one side welding with back formation mode, the surface of described two steel plates to be welded forms V-butt, and described first passage welding and the welding of second passage are carried out on two groove faces of described V-butt respectively.
13. method according to claim 12, wherein, the bevel angle of described V-butt is the 45-60 degree, and the group of described steel plate is 2-3mm to the gap.
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| DE19944972A1 (en) * | 1999-09-15 | 2001-04-12 | Smb Stahl Und Walzwerk Service | Conducting of heat during metal inert gas or active gas welding for metallic materials esp. low-high alloyed steels and heat treated fine grain structural steel with a 0.2 percent yield strength or larger 900 N per mm2 |
| CN1301825C (en) * | 2003-10-27 | 2007-02-28 | 宝山钢铁股份有限公司 | Weather-resistant gas-shielded solder wire |
| CN100464923C (en) * | 2006-06-09 | 2009-03-04 | 浙江省火电建设公司 | P92 steel welding process |
| CN101214573B (en) * | 2008-01-03 | 2010-12-22 | 湖北省电力试验研究院 | Medium temperature thick-wall WB36/1Cr18Ni9Ti dissimilar steel welding technology |
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