CN117680872A - Control method for improving quality of ERW welded pipe welding seam - Google Patents
Control method for improving quality of ERW welded pipe welding seam Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000001125 extrusion Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000007664 blowing Methods 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 230000001681 protective effect Effects 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 35
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 32
- 229910052786 argon Inorganic materials 0.000 description 16
- 238000010438 heat treatment Methods 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000003801 milling Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a control method for improving the quality of an ERW welded pipe welding seam, and belongs to the technical field of welding. According to the invention, two groups of air outlet pipelines are arranged in a welding area, a plurality of air outlet holes are arranged on each group of air outlet pipelines along the axial direction of each group of air outlet pipelines, and the distance h= (2.0-2.5) a between each air outlet pipeline and the welding area is equal to the distance h= (2.0-2.5) a, and the first air outlet hole is opposite to the welding starting point of the welding area. According to the invention, the distance between the air outlet pipeline and the welding area is strictly controlled, so that the influence of burrs generated in the extrusion process on the coverage area of the shielding gas is effectively eliminated, and the welding area can be covered by the shielding gas; but also can prevent the waste of air source caused by the too wide coverage range of the protective air. In addition, through the welding starting point of the first vent hole right opposite to the welding area, the position can be ensured to obtain larger gas flow so as to meet the oxidation prevention requirement under the maximum extrusion amount.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a control method for improving the quality of an ERW welded pipe welding seam.
Background
Welding, in particular high-frequency resistance welding (Electric Resistance Welding, ERW for short), is realized by using a forming machine to form a hot rolled coil, heating the edge of a tube blank to a molten state by using the proximity effect and the skin effect of high-frequency current, and then extruding the steel tube formed by the row roller by using an extruding roller. The forming mode and the welding process of the ERW pipe manufacturing technology determine that the ERW pipe has the advantages of high dimensional accuracy, uniform wall thickness, strong anti-collapse capability and the like, and the quality of a welding seam is a key index for determining the service safety of the steel pipe.
In the ERW welding process, the hot rolled coiled plate edge is heated to the welding temperature, the molten metal and inclusions on the plate edge are extruded under the action of the strong pressure of the extrusion roller, and the two plate edges are recrystallized and combined together at a high temperature. However, during the welding process, the metal in a molten state is exposed to air and inevitably oxidized by air to form a metal oxide. If the part of metal oxide cannot be completely extruded to form a welding line, the impact energy of the welding line cannot meet the corresponding requirement, so that a plurality of unsafe influences are caused to the steel pipe in the service process. Particularly, in the ERW steel pipe welding process with the limit specification (the wall thickness is more than or equal to 16 mm) and the large caliber (the diameter is more than or equal to 600 mm), the probability of metal oxide remaining in the welding line can be greatly improved because the wall thickness and the pipe diameter specification are close to the limit of a unit.
Through searching, the application with the Chinese patent publication number of CN 104842128A discloses a manufacturing method of an ultra-large diameter-thickness ratio high-frequency straight welded pipe. The application includes the steps of: firstly, milling edges of a raw material hot rolled coil by adopting an edge milling machine, controlling the tolerance of the forming width of a round tube, and ensuring the cleanness and shape of the plate edges; step two, a crimping machine is adopted to crimp two side edge parts of the strip steel, so that the roundness of a welding part is ensured; step three, adopting a rolling bottom line to perform mountain-down forming, wherein the mountain-down amount is controlled to be 30-100% of the pipe diameter; step four, realizing flexible linear molding by adopting a plurality of row roller molding frames which are arranged at short intervals; fifthly, adopting high-frequency resistance welding to the pipe blank, wherein the welding extrusion amount is controlled to be 0.2-1.0 times of the wall thickness; and step six, sizing and rounding after planing the inner and outer burrs. The method solves the quality problems of forming and welding of the ultra-large diameter-thickness ratio high-frequency welding round tube, eliminates the defects of corrugated welding edge, welding misalignment, poor welding quality and the like, and can be widely applied to the field of steel tube manufacturing.
For another example, chinese patent publication No. CN 103240515A discloses a quality control method for a welded zone of a high frequency resistance welded pipe. The application comprises the following steps: firstly, heating the surface to be welded to T (DEG C) =1538-113 wc by using an induction heating mode, wherein the heating time is 5-10 s; secondly, arranging an inert gas nozzle at the positions of the surfaces to be welded on the two sides of the welding line of the welded pipe respectively, wherein the gas flow is 5-10L/min; thirdly, during welding, the nozzle sprays inert gas to the surface to be welded until the welding line is completely fused under the action of pressure, so that nonmetallic inclusion of the welding line is effectively reduced; fourthly, after welding, carrying out local heat treatment on the welding seam, wherein the heating mode is induction heating, the heating temperature is controlled to be 920-940 ℃, and air cooling is adopted to obtain a uniform welding seam structure; fifth, after the local heat treatment, the whole heat treatment is carried out on the welding seam, so that the internal stress and stable structure of the welding area are reduced, a high-quality resistance welding joint is obtained, and the sensitivity of the welding seam to stress corrosion and groove corrosion is reduced.
All the above applications relate to improvement of welding seam quality control technology, but still have a certain optimization space, and technical researches for improving welding seam quality in the industry have not been stopped all the time.
Disclosure of Invention
1. Problems to be solved
Aiming at the defects that in the existing ERW welding process, metal in a molten state is exposed in the air to easily form metal oxide, so that the quality of a welding seam is difficult to ensure. The invention provides a control method for improving the quality of an ERW welded pipe welding seam, which can effectively prevent the oxidation of metal in a welding fusion area and ensure the quality of the welding seam by adopting the technical scheme of the invention.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the control method for improving the welding seam quality of the ERW welded pipe comprises arranging an air outlet pipeline above the welding area in parallel, arranging an air outlet hole on the air outlet pipeline for blowing air into the welding area,
the distance h= (2.0-2.5) ·a between the air outlet pipe and the welding area is single-side extrusion quantity, and the unit is mm.
Further, two groups of air outlet pipelines are arranged, and the included angle between the two groups of air outlet pipelines is the same as the welding opening angle; the gas outlet pipeline is provided with a plurality of gas outlet holes, and the first gas outlet hole is opposite to a welding starting point of the welding area.
Further, two groups of air outlet pipelines are communicated with the same air inlet pipeline, and D 1 ＝(1.5～2)D 2 Wherein D is 1 Is the pipe diameter of the air inlet pipe D 2 Is the pipe diameter of the air outlet pipe.
Further, the method comprises the steps of,
wherein kv is 2 Is the expected weld impact value;
Q i the air outlet quantity of the corresponding air outlet hole;
Q feeding in Is the total flow of the air inlet pipeline;
l2 is the total length of the air outlet pipeline;
l1 is the vertical distance between the first air outlet hole and the air inlet pipeline;
l is the interval between two adjacent air outlet holes.
Further, said Q Feeding in 128-320 mm 3 80-150 mm for L2 and 5-15 mm for L。
Further, said D 1 15-20 mm, D 2 The aperture D of the air outlet hole is 6-10 mm 3 Is 1-3 mm.
Further, the welding opening angle is controlled to be 4-7 degrees.
Further, during the welding process, when the power of the squeeze rolls during the welding process reaches a threshold of 85% of the equipment limit power, the shielding gas is turned on.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the control method for improving the welding quality of the ERW welded pipe, the welding area is protected by blowing out the protective gas through the gas outlet hole on the gas outlet pipeline, so that the oxidation of metal in the welding fusion area can be effectively prevented, and the welding quality is ensured. Meanwhile, by strictly controlling the distance between the air outlet pipeline and the welding area, the influence of burrs generated in the extrusion process on the coverage area of the shielding gas is effectively eliminated, so that the welding area can be covered by the shielding gas; but also can prevent the waste of air source caused by the too wide coverage range of the protective air.
(2) According to the control method for improving the welding seam quality of the ERW welded pipe, two groups of air outlet pipelines are arranged, and each group is provided with a plurality of air outlet holes, so that the whole welding area can be completely covered by the protective gas; in addition, as the welding starting point is used as the starting point of the welding operation, the extrusion amount of the position is the largest at the moment, and the first air outlet is opposite to the welding starting point of the welding area, so that the position can obtain larger air flow to meet the oxidation prevention requirement under the maximum extrusion amount.
(3) According to the control method for improving the quality of the ERW welded pipe weld, the flow of the shielding gas and the corresponding pipeline can be flexibly designed according to the target weld impact value through the research between the expected weld impact value of the welding area, the shielding gas flow and the pipeline diameter, so that guidance is provided for enterprises.
Drawings
FIG. 1 is a schematic view of a gas protection device according to the present invention;
FIG. 2 is a schematic diagram of the distribution of the gas outlet holes in the present invention;
fig. 3 is a schematic view of the welding state of the present invention.
FIG. 4 is an enlarged view of a portion of a weld area according to the present invention;
FIG. 5 is a graph of weld energy spectrum without argon protection in the present invention.
In the figure: 1. an air outlet pipe; 11. an air outlet hole; 2. an air intake duct; 3. a welding region; 31. a welding starting point; 4. a tube blank; 5. squeeze rolls.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings.
The invention is further described below in connection with specific embodiments.
Example 1
According to the control method for improving the welding quality of the ERW welded pipe, the gas protection device is adopted for protection welding in the welding process, so that the welding quality is ensured.
Referring to fig. 1 and 2, the gas protection device comprises an air outlet pipeline 1 and an air inlet pipeline 2 which are communicated with each other. Wherein, the air outlet pipeline 1 is provided with an air outlet hole 11, and the air inlet pipeline 2 is communicated with a protective air source.
The shielding gas is inert gas, preferably argon. Firstly, the argon ratio is higher than that of air, and the argon falls on a welding area after being purged; and secondly, argon is nontoxic and harmless gas, and has high safety. In addition, because of the high-temperature and humid environment of the welding area, the air inlet pipeline 2 and the air outlet pipeline 1 are both copper steel pipes.
According to the control method for improving the quality of the welding seam of the ERW welded pipe, the air outlet pipeline 1 is arranged above the welding area 3 in parallel, the welding area is protected by the argon gas blown out through the air outlet hole 11, oxidation of metal in a welding fusion area can be effectively reduced, and the quality of the welding seam is guaranteed.
In order to ensure that the argon gas can completely cover the whole welding area 3, a plurality of air outlet holes 11 can be arranged along the axial direction of the air outlet pipeline 1.
Referring to fig. 3, due to the extrusion of the tube blank 4 by the extrusion roll 5, the molten metal in the welding region 3 is extruded from the weld joint, so that burrs are easily generated, and the existence of the burrs affects the coverage of argon gas, thereby affecting the protection effect on the molten metal.
For this purpose, the distance h between the gas outlet pipe 1 and the welding region 3 is set to 2.0 to 2.5 times the single-side extrusion amount, i.e., h= (2.0 to 2.5) ·a, where a is the single-side extrusion amount in mm.
On one hand, the design eliminates the influence of burrs on the argon coverage area so as to ensure that the welding area 3 can be completely covered by shielding gas; on the other hand, the waste of air sources caused by the too wide coverage of argon can be prevented.
Example 2
In order to further improve the oxidation resistance of the welded region 3.
In this embodiment, the air outlet pipe 1 is provided with 2 groups, which are parallel to the corresponding hot rolled edge portions respectively; the angle between the two gas outlet pipes 1 is the same as the welding opening angle, and the flow direction of the shielding gas in the gas outlet pipe 1 is opposite to the moving direction of the pipe blank 4 (as the arrow direction in fig. 3).
Two air outlet pipelines 1 are communicated with the same air inlet pipeline 2, and D 1 ＝(1.5～2)D 2 Wherein D is 1 Is the pipe diameter of the air inlet pipe D 2 Is the pipe diameter of the air outlet pipe. The design is beneficial to ensuring the relative balance of the flow of the gas in the two gas outlet pipelines 1, and the selection of the pipe diameter is beneficial to ensuring the gas pressure in the gas inlet pipeline 1.
The first air outlet hole 11 close to the air inlet pipeline 2 is required to be opposite to the welding starting point 31 of the welding area 3, so as to ensure that the protection air blown out of the air outlet hole 11 can completely cover the welding starting point 31.
This is because the welding start point 31 serves as a start point of the welding operation, and the extrusion amount at this point is also the largest, and by facing the first gas outlet holes 11 on the two gas inlet pipes 2 to the welding start point 31 of the welding area, it is ensured that a larger gas flow can be obtained at this point to meet the oxidation prevention requirement under the maximum extrusion amount.
In particular in this embodiment, the welding opening angle is controlled to be 4-7 °, preferably 5 °.
Example 3
Because of different blowing amounts, the welding area (3) has different protection effects, so that the performance requirements of corresponding welding impact work can be met, and the waste of argon can not be caused.
In the embodiment, through the research between the expected weld impact value of the welding area and the protection air flow and the pipe diameter of the pipeline, the flow of the protection air and the corresponding pipeline can be flexibly designed according to the target weld impact value, so that guidance is provided for enterprises.
In particular, the method comprises the steps of,
wherein kv is 2 Is the expected weld impact value;
Q i the air outlet quantity of the corresponding air outlet hole;
Q feeding in The value range is 128-320 mm for the total flow of the air inlet pipeline 3 /s；
L2 is the total length of the air outlet pipeline, and the value range is 80-150 mm;
l1 is the vertical distance between the first air outlet hole and the air inlet pipeline;
l is the interval between two adjacent air outlet holes, and the value range is 5-15 mm;
D 1 the pipe diameter of the air inlet pipe is 15-20 mm;
D 2 the pipe diameter of the air outlet pipe is 6-10 mm;
n is the number of the air outlet holes, and the value range is 3-10;
the aperture of the air outlet hole is 1-3 mm.
Example 4
To further increase the utilization rate of argon, unnecessary waste is avoided.
In this embodiment, when the power of the squeeze roller 5 reaches the 85% threshold of the device limit power in the welding process, the gas protection device is turned on, and according to different requirements, the intake valve of the intake pipe is turned on to different extents, specifically see table 1.
Table 1: inlet valve opening degree design table
Example 5
By using the control method for the quality of the ERW welded pipe weld joint in the embodiment, a steel pipe with the limit specification of phi 610 multiplied by 20.6mm is prepared, and the chemical components of the raw materials are as follows: c:0.020% -0.070%, si: less than or equal to 0.30 percent, mn:1.0% -1.70%, P: less than or equal to 0.015 percent, S: less than or equal to 0.0050%, less than or equal to 0.06% Nb, less than or equal to 0.025% Ti, less than or equal to 0.06% V, less than or equal to 0.20% Mo, less than or equal to 0.25% Cu, and Ni:0.10 to 0.30 percent, cr is less than or equal to 0.25 percent, and N is less than or equal to 0.008 percent.
The width of the edge milling machine after edge milling is 1884mm, the edge milling quantity of a single edge is 5mm, and the sum of the maximum edge milling width is less than or equal to 12mm in order to ensure that the edge milling machine is not damaged. The welding power is set to 950KW, the welding speed is 7m/min, the welding opening angle is 5 degrees, the single-side extrusion amount of welding is 5mm, and the angle of a metal streamline is controlled to be 70 degrees.
Under the conditions of the specification and the steel grade, the switch of the argon protection device is in a full-open state.
Wherein the total flow is 160mm 3 /s, diameter of intake duct D 1 Is 16mm in diameter D of the air outlet pipeline 2 9mm, and the length of the air outlet pipeline is 100mm; 7 air outlet holes with the diameter of 2mm are uniformly distributed on the air outlet pipeline, and the distance between the air outlet holes is 10mm.
After welding, carrying out heat treatment on the welding seam, wherein the temperature of the intermediate frequency heat treatment 4 frames is respectively as follows: 1#900.+ -. 20 ℃, 2#1000.+ -. 20 ℃, 3#1000.+ -. 20 ℃, 4#1000.+ -. 20 ℃.
Finally butt weldingThe base metal and weld impact properties of the gauge steel pipe were compared with those without argon protection, as shown in Table 2.
TABLE 2 Steel tube impact data table (0 ℃ C.)
As can be seen from the above table, at level X65According to the steel pipe implementation case of the specification, when ERW welding meets the limit strength of the limit specification, the welding is performed through argon protection, and finally, the stable impact value of the welding line of the steel pipe is more than or equal to 300J, so that high-quality welding is realized.
As shown in FIG. 5, the weld joint has larger unfused cracks at the defect part of the weld joint without argon protection, the crack content is mainly oxide inclusion, and the oxides are SiO and Al 2 O 3 、MnO、Fe 2 O 3 . Fe with tight combination between crack gap area and steel matrix 2 O 3 Inclusions. It can be seen that there are a large number of oxide inclusions in the cracks that are not squeezed out, which is a key factor that causes instability in the impact value of the weld. Thus, the impact power of the welding line is sporadically low in value (less than 50J), and a plurality of unsafe influences can be given to the steel pipe in the service process.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (9)
1. A control method for improving the quality of an ERW welded pipe weld joint is characterized in that shielding gas is adopted for shielded welding in the welding process of a steel pipe, and the control method is characterized in that: an air outlet pipeline (1) is arranged above the welding area (3) in parallel, an air outlet hole (11) for blowing air to the welding area (3) is arranged on the air outlet pipeline (1),
the distance h= (2.0-2.5) ·a between the air outlet pipe (1) and the welding area (3) is a single-side extrusion amount, and the unit is mm.
2. The method for controlling the quality of an ERW welded pipe weld according to claim 1, wherein: the two groups of the air outlet pipelines (1) are arranged, and the included angle between the two groups of the air outlet pipelines (1) is the same as the welding opening angle; the gas outlet pipeline (1) is provided with a plurality of gas outlet holes (11), and the first gas outlet hole (11) is opposite to a welding starting point (31) of the welding area (3).
3. The control method for improving the weld quality of the ERW welded pipe according to claim 2, wherein the control method comprises the following steps: two groups of air outlet pipelines (1) are communicated with the same air inlet pipeline (2), and D 1 ＝(1.5～2)D 2 Wherein D is 1 Is the pipe diameter of the air inlet pipe D 2 Is the pipe diameter of the air outlet pipe.
4. A control method for improving the weld quality of an ERW welded pipe according to claim 3, characterized by:
wherein kv is 2 For the expected weld impact value, qi is the air output for the corresponding air outlet aperture (11).
5. The control method for improving the weld quality of the ERW welded pipe according to claim 4, wherein the control method comprises the following steps:
wherein Q is Feeding in Is the total flow of the air inlet pipeline; l2 is the total length of the air outlet pipeline; l1 is the vertical distance between the first air outlet hole and the air inlet pipeline; l is the interval between two adjacent air outlet holes.
6. The control method for improving the weld quality of the ERW welded pipe according to claim 5, wherein the control method comprises the following steps: said Q Feeding in 128-320 mm 3 And/s, L2 is 80-150 mm, and L is 5-15 mm.
7. The control method for improving the weld quality of the ERW welded pipe according to claim 6, wherein the control method comprises the following steps: said D 1 15-20 mm, D 2 The aperture D of the air outlet hole is 6-10 mm 3 Is 1-3 mm.
8. A control method for improving the weld quality of an ERW welded pipe according to any one of claims 1 to 7, characterized by: the welding opening angle is controlled to be 4-7 degrees.
9. The control method for improving the weld quality of the ERW welded pipe according to claim 8, wherein: during the welding process, when the power of the squeeze roller (5) reaches a threshold of 85% of the device limit power during the welding process, the shielding gas is turned on.
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