CN114346382A - Single-wire and double-wire combined submerged arc automatic welding method - Google Patents
Single-wire and double-wire combined submerged arc automatic welding method Download PDFInfo
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- CN114346382A CN114346382A CN202111515727.XA CN202111515727A CN114346382A CN 114346382 A CN114346382 A CN 114346382A CN 202111515727 A CN202111515727 A CN 202111515727A CN 114346382 A CN114346382 A CN 114346382A
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Abstract
The invention relates to a single-double wire combined submerged arc automatic welding method, which is used for welding stainless steel plates with the plate thickness within 20mm and comprises the following steps: step 1, cleaning before welding; step 2, assembling and positioning the steel plate, wherein the groove at the butt weld joint of the steel plate is I-shaped; step 3, assembling a welding trolley, adjusting the angle and the distance of welding wires, enabling the front wire to deflect 10-20 degrees towards the welding direction along the direction vertical to the steel plate, enabling the rear wire to deflect 0-5 degrees relative to the direction vertical to the steel plate, enabling the elongation of the front wire to be 25-35mm, enabling the elongation of the rear wire to be 30-40mm, and enabling the distance between the double wires to be 30-40 mm; step 4, double-wire welding is carried out on the front side, and the steel plate is turned over after the welding is finished; and 5, assembling monofilament submerged arc welding equipment, and performing back side monofilament welding. The invention adopts a mode of mixing the twin-wire submerged arc welding and the single-wire submerged arc welding, thereby improving the actual utilization rate of the butt welding machine and improving the working efficiency; the processing workload of the groove of the welding plate is reduced, the submerged-arc welding of the steel plate within the thickness of 20mm can be met, and the construction efficiency is favorably improved.
Description
Technical Field
The invention relates to the technical field of hull seam welding, in particular to a single-double wire combined submerged arc automatic welding method.
Background
The double-wire submerged-arc welding method is further improved, and two independent electric arcs are welded in a common molten pool, so that the purposes of improving the welding speed and the quality of a welding seam are achieved. In twin wire submerged arc welding, the front wire acts directly on the base metal as a leading wire, while the rear wire acts on the molten metal pool formed by the front wire.
The double-wire submerged arc welding adopts double power supplies and double welding wires (electrodes), the front wire is in direct current, the rear wire is in alternating current, the front electrode is in direct current, large welding current and low arc voltage are adopted, the penetrating power of direct current arc is fully exerted, and large melting depth is obtained. The back electrode is AC, which can reduce the mutual influence and magnetic blow between the front wire and the arc, and adopts relatively small welding current and large arc voltage to overcome the accumulation of molten metal caused by large current of the front wire, and high speed welding is matched, thus obtaining beautiful welding seam.
For the I-shaped groove, the conventional process can only weld steel plates with the thickness of less than 16mm, and steel plates with the thickness of more than 16mm are not only grooved (as shown in figure 2), but also have about 8mm roots and need to be subjected to reverse carbon planing. The method not only increases the workload of cutting the groove, reduces the working efficiency, but also increases the usage amount of welding materials to a certain extent.
At present, steel plates with the thickness of about 20mm are mainly spliced in ship construction, and each plate needs to be subjected to welding groove cutting, root reserving and reverse carbon planing according to a conventional process, so that the workload is increased, and the construction period is prolonged.
Disclosure of Invention
In order to solve the technical problems, the invention provides a single-double wire combined submerged arc automatic welding method, and by adopting the welding method, I-shaped grooves can be adopted for welding steel plates with the thickness of less than 20mm, so that the workload is reduced, and the construction speed is increased.
The technical purpose of the invention is realized by the following technical scheme:
a single-double wire combined submerged arc automatic welding method is used for welding stainless steel plates with the plate thickness within 20mm, and comprises the following steps:
step 4, double-wire welding is carried out on the front side, and the steel plate is turned over after the welding is finished;
and 5, assembling monofilament submerged arc welding equipment, and performing back side monofilament welding.
Further, in step 2, the tolerance of the steel plate assembly gap is 0-1 mm.
Further, the assembly positioning adopts CO2And (4) semi-automatic welding, wherein the height of a welding seam of the positioning welding is not more than 3 mm.
Furthermore, the length of the tack welds is greater than 50mm, and defects such as air holes, slag inclusion, cracks and weld penetration are not allowed.
Further, in the step 2, the installation of the arc striking and extinguishing plate is also included, and the groove of the arc striking and extinguishing plate is the same as the groove of the steel plate.
Further, in step 4, during the front-surface double-wire welding, the welding current of the front wire on the front surface is 650-850A, and the welding voltage is 32-38V; the welding current of the front rear wire is 550-650A, and the welding voltage is 32-38V; the speed of front double-wire welding is 60-75 cm/min.
Further, in step 5, the welding current of the back side monofilament is 650-850A, the welding voltage is 32-38V, and the welding speed of the back side monofilament is 40-55 cm/min.
Further, in step 1, oil stain, rust, water and oxides in the gap of the groove and the 20mm regions on both sides of the groove of the steel plate are removed before welding, and the moisture in the gap is dried.
Further, the rear filaments are perpendicular to the steel plate, i.e. the rear filaments are deflected 0 ° with respect to the perpendicular steel plate direction.
Compared with the prior art, the invention has the advantages that the invention adopts a mode of mixing the twin-wire submerged arc welding and the single-wire submerged arc welding, thereby improving the actual utilization rate of the butt welding machine and improving the working efficiency; in addition, the welding method reduces the processing workload of the groove of the welding plate, can meet the submerged arc welding of the steel plate with the thickness within 20mm, and is beneficial to improving the construction efficiency.
Drawings
FIG. 1 is a schematic view of a twin wire welding wire alignment of the present invention.
Fig. 2 is a schematic diagram of the bevel before modification.
FIG. 3 is a schematic diagram of the groove in the present invention.
FIG. 4 is a macroscopic metallographic analysis of a weld seam after welding of a steel plate with a thickness of 20mm by the welding method of the present invention.
FIG. 5 is a macroscopic metallographic analysis of a weld seam after welding of a steel plate having a thickness of 15mm by the welding method of the present invention.
In the figure, 1, anterior filament; 2. back silking; 3. and (3) a steel plate.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments:
a single-double wire combined submerged arc automatic welding method is used for welding stainless steel plates with the plate thickness within 20mm, and comprises the following steps:
step 4, front double-wire welding, wherein when the front double-wire welding is carried out, the welding current of the front wire on the front side is 650-850A, and the welding voltage is 32-38V; the welding current of the front rear wire is 550-650A, and the welding voltage is 32-38V; the speed of front double-wire welding is 60-75 cm/min; turning over the steel plate after welding;
and 5, assembling monofilament submerged arc welding equipment, and welding the back side monofilaments, wherein the welding current of the back side monofilaments is 650 plus 850A, the welding voltage is 32-38V, and the welding speed of the back side monofilaments is 40-55 cm/min.
A steel plate groove with the plate thickness of 20mm is selected to be in an I shape, as shown in figure 3, the steel plate grade is EH36, welding wires produced by China Jiesheng manufacturers are selected as the welding wires, and the diameters of single-wire welding wires and double-wire welding wires are both 4.8 mm. After the equipment is calibrated before welding, as shown in fig. 1, the front wire 1 is deviated by 20 degrees to the welding direction along the direction vertical to the steel plate, and the rear wire 2 is opposite to the vertical steel plate. The welding current of the front wire on the front surface is 850A, the welding voltage is 38V, the welding current set for the rear wire on the front surface is 650A, the welding voltage is 35V, and the speed of the double-wire welding machine is 75 cm/min; the welding current set for the single wire on the back surface is 850A, the welding voltage is 38V, and the welding speed of the single wire is 60 cm/min.
A steel plate groove with the thickness of 15mm is selected to be in an I shape, as shown in figure 3, the steel plate grade is EH36, welding wires produced by China Jiehangwang manufacturers are selected as the welding wires, and the diameters of single-wire welding wires and double-wire welding wires are both 4.8 mm. After the equipment is calibrated before welding, as shown in fig. 1, the front wire 1 deviates by 20 degrees to the welding direction along the direction vertical to the steel plate, and the rear wire 2 is vertical to the steel plate. The welding current of the front wire on the front surface is 650A, the welding voltage is 32V, the welding current set for the rear wire on the front surface is 550A, the welding voltage is 32V, and the speed of the double-wire welding machine is 60 cm/min; the welding current set for the single wire on the back surface is 650A, the welding voltage is 32V, and the welding speed of the single wire is 40 cm/min.
The steel plate with the thickness of 20mm and the steel plate with the thickness of 15cm are welded by the method, the quality of the welding seam is detected after the welding is finished, as shown in figures 4 and 5, the welding seam can be seen to be completely penetrated, no welding defect exists in figures 4 and 5, and the field certification of ABS classification society is obtained.
The consumption of the carbon rod can be reduced by adopting the form of double front filaments and single back filaments without carbon planing, and because a large amount of high-temperature liquid metal and oxides are blown out from the electric arc during carbon planing, fire can be prevented and workers can not be scalded. On the contrary, in the carbon planing process, due to rapid heating and cooling and local chemical reaction, a carburization phenomenon and a heat affected zone are generated on the planing surface and adjacent areas, and the change of the texture property and the hardness is caused. The carbon-planed surface is uneven and the surface is heavily oxidized, and a heat affected zone with the width of 1mm-2mm and a carbon-added layer with the thickness of 0.1mm-0.3mm exist near the planed surface. Therefore, the groove after carbon planing can be welded only after being polished and cleaned.
On the basis of the original welding process, the improved groove form can save welding time, improve working efficiency, save welding wire consumption, steel plate cutting time and gas and electric energy consumption on the premise of ensuring welding quality, and fully exert the characteristics of high efficiency, energy conservation, high quality and economy of the twin-wire submerged arc welding. Generally, double-wire submerged arc welding is adopted, so that equipment for single-wire submerged arc welding is idle, and the method of the invention ensures that the idle single-wire submerged arc welding equipment is fully utilized: in addition, if the front side and the back side are both subjected to twin-wire submerged arc welding, the workload is increased, the front side and the back side are both turned over and corrected when welding is needed, and monofilament welding equipment is adopted in the aspect, so that the welding equipment can be fully utilized, the workload can be reduced, and the back side monofilament welding only needs to turn over the steel plate.
The present invention is further explained and not limited by the embodiments, and those skilled in the art can make various modifications as necessary after reading the present specification, but all the embodiments are protected by the patent law within the scope of the claims.
Claims (9)
1. A single-double wire combined submerged arc automatic welding method is used for welding stainless steel plates with the plate thickness within 20mm, and is characterized by comprising the following steps:
step 1, cleaning before welding;
step 2, assembling and positioning the steel plate, wherein the groove at the butt weld joint of the steel plate is I-shaped;
step 3, assembling a welding trolley, adjusting the angle and the distance of welding wires, enabling the front wire to deflect 10-20 degrees towards the welding direction along the direction vertical to the steel plate, enabling the rear wire to deflect 0-5 degrees relative to the direction vertical to the steel plate, enabling the elongation of the front wire to be 25-35mm, enabling the elongation of the rear wire to be 30-40mm, and enabling the distance between the double wires to be 30-40 mm;
step 4, double-wire welding is carried out on the front side, and the steel plate is turned over after the welding is finished;
and 5, assembling monofilament submerged arc welding equipment, and performing back side monofilament welding.
2. The single and double wire combination submerged arc automatic welding method according to claim 1, wherein in the step 2, the tolerance of the steel plate assembling clearance is 0-1 mm.
3. The automatic submerged arc welding method with single and double combined wires according to claim 1, characterized in that CO is adopted for assembly positioning2And (4) semi-automatic welding, wherein the height of a welding seam of the positioning welding is not more than 3 mm.
4. The single and double wire combination submerged arc automatic welding method according to claim 3, characterized in that the length of the tack weld is more than 50mm, and defects such as air holes, slag inclusion, cracks and weld penetration are not allowed.
5. The automatic single-double wire combined submerged arc welding method according to claim 1, wherein in the step 2, the method further comprises installing a run-on and run-off plate, and the groove of the run-on and run-off plate is the same as the groove of the steel plate.
6. The automatic submerged arc welding method for the combination of the single wire and the double wire as recited in claim 1, wherein in the step 4, during the front-side double-wire welding, the welding current of the front-side front wire is 650-850A, and the welding voltage is 32-38V; the welding current of the front rear wire is 550-650A, and the welding voltage is 32-38V; the speed of front double-wire welding is 60-75 cm/min.
7. The automatic single-double wire combined submerged arc welding method as claimed in claim 1, wherein in said step 5, the welding current of the back side monofilament is 650-.
8. The single and double wire combination submerged automatic arc welding method according to claim 1,
in the step 1, before welding, oil stain, rust, water and oxides in the gap of the groove of the steel plate and the area of 20mm on each side of the groove are removed, and the water in the gap is dried.
9. The single and double wire combination submerged arc automatic welding method according to claim 1, characterized in that the rear wire is perpendicular to the steel plate.
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| CN202111515727.XA CN114346382A (en) | 2021-12-13 | 2021-12-13 | Single-wire and double-wire combined submerged arc automatic welding method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985884A (en) * | 2022-06-01 | 2022-09-02 | 中船黄埔文冲船舶有限公司 | Method for shielding numerical control cutting groove |
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| JPH07314181A (en) * | 1994-05-27 | 1995-12-05 | Nippon Steel Corp | High-speed horizontal fillet gas shielded arc welding method |
| US20030052110A1 (en) * | 2001-09-07 | 2003-03-20 | Gandy David Wayne | Controlled composition welding method |
| CN106825872A (en) * | 2017-03-08 | 2017-06-13 | 武汉天高熔接股份有限公司 | Hardware positive and negative synchronization full penetration technique |
| CN107052539A (en) * | 2017-02-16 | 2017-08-18 | 山东奥太电气有限公司 | A kind of cut deal mariages twin arc submerged arc welding technique for exempting from back chipping |
| CN107322132A (en) * | 2017-08-28 | 2017-11-07 | 上海外高桥造船有限公司 | A kind of welding method more than 38mm thickness hull plates |
| CN107813036A (en) * | 2016-09-13 | 2018-03-20 | 张盘 | A kind of two-sided single track buried arc welding method of cut deal mariages |
| CN110640277A (en) * | 2019-09-30 | 2020-01-03 | 广州黄船海洋工程有限公司 | Q420 high-strength steel thick plate non-preheating double-wire submerged-arc welding process |
-
2021
- 2021-12-13 CN CN202111515727.XA patent/CN114346382A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07314181A (en) * | 1994-05-27 | 1995-12-05 | Nippon Steel Corp | High-speed horizontal fillet gas shielded arc welding method |
| US20030052110A1 (en) * | 2001-09-07 | 2003-03-20 | Gandy David Wayne | Controlled composition welding method |
| CN107813036A (en) * | 2016-09-13 | 2018-03-20 | 张盘 | A kind of two-sided single track buried arc welding method of cut deal mariages |
| CN107052539A (en) * | 2017-02-16 | 2017-08-18 | 山东奥太电气有限公司 | A kind of cut deal mariages twin arc submerged arc welding technique for exempting from back chipping |
| CN106825872A (en) * | 2017-03-08 | 2017-06-13 | 武汉天高熔接股份有限公司 | Hardware positive and negative synchronization full penetration technique |
| CN107322132A (en) * | 2017-08-28 | 2017-11-07 | 上海外高桥造船有限公司 | A kind of welding method more than 38mm thickness hull plates |
| CN110640277A (en) * | 2019-09-30 | 2020-01-03 | 广州黄船海洋工程有限公司 | Q420 high-strength steel thick plate non-preheating double-wire submerged-arc welding process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985884A (en) * | 2022-06-01 | 2022-09-02 | 中船黄埔文冲船舶有限公司 | Method for shielding numerical control cutting groove |
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