CN1199755C - Process for improving weld metal toughness of submerged arc welding - Google Patents
Process for improving weld metal toughness of submerged arc welding Download PDFInfo
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- CN1199755C CN1199755C CN 01133306 CN01133306A CN1199755C CN 1199755 C CN1199755 C CN 1199755C CN 01133306 CN01133306 CN 01133306 CN 01133306 A CN01133306 A CN 01133306A CN 1199755 C CN1199755 C CN 1199755C
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- weld metal
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- 239000002184 metal Substances 0.000 title claims abstract description 59
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 59
- 238000003466 welding Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 102
- 229910052786 argon Inorganic materials 0.000 claims abstract description 51
- 230000004907 flux Effects 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 abstract description 12
- 238000010891 electric arc Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 6
- 229910000679 solder Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000006104 solid solution Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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- Nonmetallic Welding Materials (AREA)
Abstract
The present invention relates to the manufacturing technology of submerged arc weld, particularly to a process for improving the weld joint metal toughness of submerged arc weld. Argon shield is adopted in the welding process of the submerged arc weld. The toughness of weld joint metal is improved by reducing the total N content of the weld joint metal. The argon shield is applied in front of an electric arc or around the electric arc along a welding direction. An argon flow rate is from 5 to 15 ml/min. The present invention can be used for reducing the total N content of the weld joint metal to 10 to 55 ppm; the low temperature impact toughness of a joint is enhanced by 30 to 50%.
Description
Technical field
The present invention relates to the submerged-arc welding manufacturing technology, a kind of specifically technology of improving weld metal toughness of submerged arc welding.
Background technology
The smelting of steel and the development of manufacturing technology at present obtains significant progress, makes the degree of purity of steel reach very high level, and the especially use of controlled rolling and controlled cooling technology makes the intensity of steel and toughness levels be higher than weld metal far away by working hardening.By contrast, the degree of purity of weld metal and toughness then are difficult to match.So be necessary to improve the toughness of weld metal, improve the toughness and the degree of purity of weld metal as much as possible by taking the degree of purity of some technological measures raising weld metals.
In general, the N in the submerged-arc welding seam metal has two kinds of forms to exist, i.e. the N of chemical combination attitude and solid solution N, and that worsen weld metal toughness mainly is solid solution N, and the N major part in the submerged-arc welding seam metal exists with the solid solution form.N in the submerged arc welding process mainly contains following several mode that enters weld metal, enters weld seam by welding material on the one hand, such as solder flux and welding wire; N in the mother metal also can enter weld metal by dilution in addition; Enter weld metal by airborne N in the welding process exactly in addition.Because the progress of modern smelting level, N content in welding wire and the mother metal is very low, so the N content of bringing into therefrom in the weld metal should be few, because the N content in the weld metal is 10～100 times of N content in welding wire or the mother metal, and do not do research so far by the N content that solder flux enters weld seam, so not clear.But what can know is, though the protection that welding arc is melted solder flux in the welding process enters electric arc and the pollution that makes weld metal be subjected to N is inevitably by air, so that the N content of weld metal far above the N content in the mother metal.
The interstitial site that the N that the solid solution form exists is in parent metal makes the atom of parent metal produce distortion, and perhaps N gathers partially near dislocation, forms the Ke Shi air mass and makes dislocation be difficult to move, thereby make METAL EMBRITTLEMENT, has reduced the toughness of material.At present, though take the microalloying measure to reduce solid solution N content in the weld metal, can not reduce the total N content in the weld metal.
Summary of the invention
The purpose of this invention is to provide a kind of technology of improving weld metal toughness of submerged arc welding that reduces N content total in the submerged-arc welding seam metal.
To achieve these goals, technical scheme of the present invention is: reduce the toughness that total N content in the submerged-arc welding seam improves weld metal by adopt argon shield in submerged arc welding process;
Described argon shield is for applying argon shield in the place ahead along welding direction, electric arc; Described argon shield is for applying argon shield around electric arc; The argon flow amount of described argon shield is 5～15ml/min; The solder flux that uses is sintered flux in described submerged-arc welding welding process.
The present invention has following advantage:
1. can effectively reduce N content total in the submerged-arc welding seam metal.Adopt the present invention, reduce total N content in the submerged-arc welding seam metal by adopting argon shield, its reduction reaches as high as 55ppm, thereby improves the weld metal low-temperature flexibility, makes the toughness of weld metal improve nearly 30～50%.
2. adopt simple, the easy row of the inventive method, can be applicable to easily in the submerged-arc welding welding process.
Description of drawings
Fig. 1 applies the argon shield schematic diagram of argon shield along welding direction, in the place ahead of electric arc for one embodiment of the invention.
Fig. 2 applies the argon shield schematic diagram of argon shield around electric arc for another embodiment of the present invention.
The specific embodiment
Below in conjunction with embodiment in detail the present invention is described in detail.
Embodiment 1
In the submerged-arc welding welding process, adopt argon shield, by reducing the toughness that the total N content of weld metal improves weld metal, be specially: described argon shield mode is for applying argon gas along welding direction, in the place ahead of electric arc, carry out argon shield, as shown in Figure 1, wherein: 1 is ignition tip, and 2 is welding wire, and 3 for applying the conduit of argon gas; The argon flow amount of described argon shield is respectively 7.5,11,14ml/min; a kind of X60 pipe line steel that in described submerged-arc welding welding process, adopts Baosteel to produce; the solder flux that uses is sintered flux SJ102; select submerged-arc welding wire E1 for use; the chemical composition of its submerged-arc welding wire E1 deposited metal sees Table 1, and it is as shown in table 2 to weld the total N content of gained deposited metal.
The chemical composition of table 1 E1 welding wire deposited metal (mass fraction, %)
| Welding wire | C | Mn | Si | Mo | Ti | B | Ni | Cu |
| E1 | .040 | 1.54 | .35 | .30 | .01 | .002 | .77 | .27 |
Table 2 argon flow amount is to the influence of deposited metal O, N content
Argon flow amount/ml/min [O]/% (mm) [N]/% (mm)
0 0.030 0.011
7.5 0.041 0.0073
11 0.039 0.0064
14 0.040 0.0056
Data by table 2 adopt argon protection technology as can be known, and along with the increase of argon flow amount, N content total in the deposited metal reduces.And O content remains unchanged substantially, this mainly be because the O in the deposited metal from welding material, and argon shield has mainly reduced by air and has entered the total N content of deposited metal, adopts technology of the present invention to make N content reduction total in the deposited metal be up to 55ppm.
In order to guarantee the repeatability of this technology; a kind of X60 pipe line steel that present embodiment adopts Baosteel to produce; with E2 welding wire (composition of its deposited metal is as shown in table 3) coupling sintered flux SJ102; described argon shield mode is for applying argon gas around electric arc; electric arc is in carries out argon shield in the argon gas atmosphere, as shown in Figure 2, wherein: 1 is ignition tip; 2 is welding wire, and 3 is the conduit of argon gas.
The chemical composition of table 3 E2 welding wire deposited metal (mass fraction, %)
| Welding wire | C | Mn | Si | Mo | Ti | B | Ni | Cu |
| E2 | .049 | 1.56 | .18 | .24 | .014 | .0017 | .26 | .25 |
The argon flow amount of described argon shield is respectively 5,8,11ml/min, and to reduce the total content of the N in the deposited metal, the influence of argon flow amount butt welded seam metal O, N content sees Table 4.
Table 4 argon flow amount is to the influence of deposited metal O, N content
Argon flow amount/ml/min [O]/% (mm) [N]/% (mm)
0 0.036 0.0072
5 0.036 0.0065
8 0.033 0.0061
11 0.036 0.0059
By the data of table 4 as can be known, adopt another kind of argon protection technology, along with the increase of argon flow amount, N content total in the deposited metal also reduces.
A kind of X60 pipe line steel that adopts Baosteel to produce mates the impact flexibility of SJ102 solder flux welding gained weld metal under different temperatures respectively with E1 and E2 welding wire, shown in table 5,6, makes the toughness of weld metal improve nearly 30～50% respectively.
The submerged welding process joint performance result of the test of table 5 argon shield
[O]/％(mm) [N]/％(mm) a
KV-10℃/J·cm
-2
175.7，110.4，165.9
Do not add argon shield 0.037 0.0091 mean value 150.7
215.6，179.7，181.4
Add argon shield 0.031 0.0050 mean value 192.2
The submerged welding process joint performance result of the test of table 6 argon shield
[O]/％(mm) [N]/％(mm) a
KV-40℃/J·cm
-2
130.7，158.7，74
Do not add argon shield 0.032 0.0091 mean value 121.1
177.5，204.3，177.3
Add argon shield 0.034 0.0050 mean value 186.4
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133306 CN1199755C (en) | 2001-10-17 | 2001-10-17 | Process for improving weld metal toughness of submerged arc welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133306 CN1199755C (en) | 2001-10-17 | 2001-10-17 | Process for improving weld metal toughness of submerged arc welding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1411939A CN1411939A (en) | 2003-04-23 |
| CN1199755C true CN1199755C (en) | 2005-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01133306 Expired - Fee Related CN1199755C (en) | 2001-10-17 | 2001-10-17 | Process for improving weld metal toughness of submerged arc welding |
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| Country | Link |
|---|---|
| CN (1) | CN1199755C (en) |
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2001
- 2001-10-17 CN CN 01133306 patent/CN1199755C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1411939A (en) | 2003-04-23 |
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