CN113399799A - Metal joint welding process - Google Patents
Metal joint welding process Download PDFInfo
- Publication number
- CN113399799A CN113399799A CN202110677288.6A CN202110677288A CN113399799A CN 113399799 A CN113399799 A CN 113399799A CN 202110677288 A CN202110677288 A CN 202110677288A CN 113399799 A CN113399799 A CN 113399799A
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- welding
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- metal
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- 238000003466 welding Methods 0.000 title claims abstract description 157
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000008569 process Effects 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 title claims abstract description 19
- 230000004907 flux Effects 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000009863 impact test Methods 0.000 claims abstract description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000004927 fusion Effects 0.000 claims description 11
- 230000007547 defect Effects 0.000 claims description 10
- 230000035515 penetration Effects 0.000 claims description 8
- 239000011324 bead Substances 0.000 claims description 5
- 238000004021 metal welding Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a metal joint welding process, belongs to the technical field of metal welding processes, solves the problem of low joint welding strength in the prior art, and comprises the following steps: s1, drying and preserving heat before welding the welding rod and the welding flux according to the process requirements; s2, cleaning water, rust, oil stain, accumulated slag and other harmful impurities on the surface and two sides of the groove, and carrying out submerged-arc welding at a distance of 20mm from the edge of the groove; s3, positioning the arc striking plate and the arc retracting plate before welding, and assembling, spot welding and welding according to the process requirements; s4, controlling the linear energy of the line for the weldment with the requirement of the impact test, wherein the linear energy of each welding pass is less than or equal to a qualified limit value; and S5, self-checking and marking the welding worker code. The invention is used for welding metal joints of containers, and the welded joints have high weld strength, stable quality and long service life.
Description
Technical Field
The invention belongs to the technical field of metal welding, and particularly relates to a metal joint welding process.
Background
A welded joint refers to a joint where two or more parts are joined by welding, or a joint where two or more parts are joined by a welding method, including a weld, a fusion zone, and a heat affected zone. Fusion welded joints are formed by localized heating from a high temperature heat source. The welded joint is composed of weld metal, a fusion zone, a heat affected zone, and base metal.
The safest and most reliable of the metal joint connections is undoubtedly a welded connection. However, the existing connecting modes have certain defects:
(1) the connection strength is low: if the socket type welding connection is lap joint connection, the welding seam is fillet welding seam, the received working stress is shear stress, according to the allowable intensity calculation method, and the effective bearing area of the fillet welding seam is 0.707 times of the effective area of the fillet welding seam, the welding seam intensity and the component equal intensity can be realized only by double-side welding. In actual construction, only one side end of the pipe fitting can be welded on one side, so that the weld strength of the socket type connecting joint can only reach 50% of the pipeline strength.
(2) The welding difficulty is great: the cylinder wall is easy to weld and penetrate, the welding part is affected by heat dissipation, a molten pool can be formed only by large heat input, if the pipe wall of the cylinder is thin, overheating is easy to burn through, and if the heat input is small, the end part of the cylinder can be poorly fused, so the operation difficulty is large. If each welding port is aerated for protection, the construction site conditions are limited and difficult, the working strength is high, and the working efficiency is low.
Disclosure of Invention
The invention aims to:
in order to solve the problem of low welding strength of the joint in the prior art, a metal joint welding process is provided.
The technical scheme adopted by the invention is as follows:
a metal joint welding process comprises the following steps:
s1, drying and preserving heat before welding the welding rod and the welding flux according to the process requirements;
s2, cleaning water, rust, oil stain, accumulated slag and other harmful impurities on the surface and two sides of the groove, and carrying out submerged-arc welding at a distance of 20mm from the edge of the groove;
s3, positioning the arc striking plate and the arc retracting plate before welding, and assembling, spot welding and welding according to the process requirements;
s4, controlling the linear energy of the line for the weldment with the requirement of the impact test, wherein the linear energy of each welding pass is less than or equal to a qualified limit value;
and S5, self-checking and marking the welding worker code.
Further, for weldments with plate thickness > 14 mm: performing double-sided welding, wherein the back of the welded joint is subjected to back chipping before welding, the length of the longitudinal welded joint is 30-50 mm, and the length of the circumferential welded joint is 40-70 mm; the height of the tack welding is 4-6 mm; the distance is 250-350 mm; if the defect of incomplete fusion or incomplete penetration exists, the welding is repositioned after being removed, and the two ends of the welding are trimmed into a gentle slope shape.
Furthermore, each layer of welding pass of the welding rod electric arc welding of the weldment with the plate thickness larger than 14mm is smaller than or equal to the diameter +2mm of the used welding rod, and the single-pass welding width is smaller than or equal to 3-4 times of the diameter of the welding rod.
Further, for a weldment with a plate thickness of 8-14 mm: the length of the longitudinal weld seam tack welding is 20-30 mm, and the length of the circumferential weld seam tack welding is 30-40 mm; the height of the tack welding is 3-6 mm; the distance is 180-250 mm; if the defects such as incomplete fusion or incomplete penetration exist, the welding is repositioned after being removed, and the two ends of the welding are trimmed into a gentle slope shape.
Furthermore, the thickness of each layer of welding bead deposited metal of the welding part filling and covering surface layer with the plate thickness of 8-14 mm is less than or equal to the diameter of the used welding rod plus 2mm, and the width of single-pass welding is less than or equal to 3-4 times of the diameter of the welding rod.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the welding process of the invention is to carry out butt welding on the joint, dry and preserve heat on a welding rod and a welding flux through perfect preparation work before welding, clear up harmful impurities, and control the size of line energy, thereby effectively improving the welding strength and the welding quality of the welded joint, leading the welding seam of the joint to bear higher-strength impact in a product container after the processing is finished, ensuring the safety of the product, preventing the welding seam from generating leakage and other accidents caused by cracks, reducing the cost of maintenance and prolonging the service life of the product.
2. The invention carries out double-sided welding on the joint with the thicker cylinder wall, carries out single-sided welding on the joint with the thinner cylinder wall, ensures the welding quality by controlling the size of the tack welding and the width of a welding bead, avoids the defects of burnthrough and the like, and overcomes the problem of high welding difficulty when the wall thickness of the joint is thinner.
Drawings
FIG. 1 is a schematic illustration of a weld according to one embodiment of the present invention;
FIG. 2 is a schematic view of a weld according to one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A metal joint welding process comprises the following steps:
s1, drying and preserving heat before welding the welding rod and the welding flux according to the process requirements;
s2, cleaning water, rust, oil stain, accumulated slag and other harmful impurities on the surface and two sides of the groove, and carrying out submerged-arc welding at a distance of 20mm from the edge of the groove;
s3, positioning the arc striking plate and the arc retracting plate before welding, and assembling, spot welding and welding according to the process requirements;
s4, controlling the linear energy of the line for the weldment with the requirement of the impact test, wherein the linear energy of each welding pass is less than or equal to a qualified limit value;
and S5, self-checking and marking the welding worker code.
Example 1
In addition to the above, as one embodiment, for a weldment with a plate thickness > 14 mm: performing double-sided welding, wherein the back of the welding line is subjected to back chipping before back welding, and the length of the longitudinal welding line is 30mm, and the length of the circumferential welding line is 40 mm; tack weld height 4; the distance is 250 mm; if the defect of incomplete fusion or incomplete penetration exists, the welding is repositioned after being removed, and the two ends of the welding are trimmed into a gentle slope shape.
Preferably, each layer of welding pass of the electrode arc welding of the weldment is less than or equal to the diameter of the used electrode +2mm, and the width of a single welding pass is less than or equal to 3 times of the diameter of the electrode.
Example 2
As one embodiment, for weldments with plate thickness > 14 mm: performing double-sided welding, wherein the back of the welding line is subjected to back chipping before back welding, and the length of the longitudinal welding line is 50mm, and the length of the circumferential welding line is 70 mm; the height of the tack weld is 6 mm; the distance is 350 mm; if the defect of incomplete fusion or incomplete penetration exists, the welding is repositioned after being removed, and the two ends of the welding are trimmed into a gentle slope shape.
Preferably, each layer of welding pass of the electrode arc welding of the weldment is less than or equal to the diameter of the used electrode +2mm, and the width of a single welding pass is less than or equal to 4 times of the diameter of the electrode.
For weldments with the plate thickness of more than 14mm, the welding parameter setting and material selection can be implemented as follows:
TABLE 1
Example 3
As one embodiment, for a weldment with the plate thickness of 8-14 mm: the length of the longitudinal weld seam tack welding is 20mm, and the length of the circumferential weld seam tack welding is 30 mm; the positioning welding height is 3 mm; the distance is 180 mm; if the defects such as incomplete fusion or incomplete penetration exist, the welding is repositioned after being removed, and the two ends of the welding are trimmed into a gentle slope shape.
Preferably, the thickness of deposited metal of each layer of welding bead of the welding part filling and covering layer is less than or equal to the diameter of the used welding rod +2mm, and the width of single welding pass is less than or equal to 3 times of the diameter of the welding rod.
Example 4
As one embodiment, for a weldment with the plate thickness of 8-14 mm: the length of the longitudinal weld seam tack welding is 30mm, and the length of the circumferential weld seam tack welding is 40 mm; the height of the tack weld is 6 mm; the distance is 250 mm; if the defects such as incomplete fusion or incomplete penetration exist, the welding is repositioned after being removed, and the two ends of the welding are trimmed into a gentle slope shape.
Furthermore, the thickness of each layer of welding bead deposited metal of the welding part filling and covering surface layer with the plate thickness of 8-14 mm is less than or equal to the diameter of the used welding rod plus 2mm, and the width of single-pass welding is less than or equal to 4 times of the diameter of the welding rod.
For a weldment with the thickness of 8-14 mm, the welding parameter setting and material selection can be implemented as follows:
TABLE 2
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A metal joint welding process is characterized by comprising the following steps:
s1, drying and preserving heat before welding the welding rod and the welding flux according to the process requirements;
s2, cleaning water, rust, oil stain, accumulated slag and other harmful impurities on the surface and two sides of the groove, and carrying out submerged-arc welding at a distance of 20mm from the edge of the groove;
s3, positioning the arc striking plate and the arc retracting plate before welding, and assembling, spot welding and welding according to the process requirements;
s4, controlling the linear energy of the line for the weldment with the requirement of the impact test, wherein the linear energy of each welding pass is less than or equal to a qualified limit value;
and S5, self-checking and marking the welding worker code.
2. A metal joint welding process according to claim 1, wherein for weldments having a plate thickness > 14 mm: performing double-sided welding, wherein the back of the welded joint is subjected to back chipping before welding, the length of the longitudinal welded joint is 30-50 mm, and the length of the circumferential welded joint is 40-70 mm; the height of the tack welding is 4-6 mm; the distance is 250-350 mm; if the defect of incomplete fusion or incomplete penetration exists, the welding is repositioned after being removed, and the two ends of the welding are trimmed into a gentle slope shape.
3. A process for welding a metal joint as defined in claim 2, wherein the arc welding of the electrode of the welding member having a thickness of 14mm is performed with a diameter of the electrode +2mm or less per pass and a width of a single pass is 3 to 4 times the diameter of the electrode or less.
4. A metal joint welding process according to claim 1, wherein for a weldment with a plate thickness of 8 to 14 mm: the length of the longitudinal weld seam tack welding is 20-30 mm, and the length of the circumferential weld seam tack welding is 30-40 mm; the height of the tack welding is 3-6 mm; the distance is 180-250 mm; if the defects such as incomplete fusion or incomplete penetration exist, the welding is repositioned after being removed, and the two ends of the welding are trimmed into a gentle slope shape.
5. A metal joint welding process as claimed in claim 4, wherein the thickness of deposited metal of each layer of welding bead of the welding part filling and covering layer with the plate thickness of 8-14 mm is less than or equal to the diameter of the welding rod used by +2mm, and the width of single welding pass is less than or equal to 3-4 times of the diameter of the welding rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110677288.6A CN113399799A (en) | 2021-06-18 | 2021-06-18 | Metal joint welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110677288.6A CN113399799A (en) | 2021-06-18 | 2021-06-18 | Metal joint welding process |
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| Publication Number | Publication Date |
|---|---|
| CN113399799A true CN113399799A (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110677288.6A Pending CN113399799A (en) | 2021-06-18 | 2021-06-18 | Metal joint welding process |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384677A (en) * | 2014-11-05 | 2015-03-04 | 九冶建设有限公司 | Super-thick steel plate welding method |
| CN105081528A (en) * | 2015-06-24 | 2015-11-25 | 浙江东南网架股份有限公司 | Welding technology of Q345qE structural steel |
| CN105750712A (en) * | 2014-12-13 | 2016-07-13 | 重庆迎瑞升压铸有限公司 | Submerged-arc welding technique |
| CN105983752A (en) * | 2015-01-30 | 2016-10-05 | 重庆金亚模具制造有限公司 | Low-alloy steel pipe welding process |
| KR20180074365A (en) * | 2016-12-23 | 2018-07-03 | 주식회사 포스코 | Welding joint of thick steel plate having excellent low temperature toughness and welding method of the same |
-
2021
- 2021-06-18 CN CN202110677288.6A patent/CN113399799A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384677A (en) * | 2014-11-05 | 2015-03-04 | 九冶建设有限公司 | Super-thick steel plate welding method |
| CN105750712A (en) * | 2014-12-13 | 2016-07-13 | 重庆迎瑞升压铸有限公司 | Submerged-arc welding technique |
| CN105983752A (en) * | 2015-01-30 | 2016-10-05 | 重庆金亚模具制造有限公司 | Low-alloy steel pipe welding process |
| CN105081528A (en) * | 2015-06-24 | 2015-11-25 | 浙江东南网架股份有限公司 | Welding technology of Q345qE structural steel |
| KR20180074365A (en) * | 2016-12-23 | 2018-07-03 | 주식회사 포스코 | Welding joint of thick steel plate having excellent low temperature toughness and welding method of the same |
Non-Patent Citations (4)
| Title |
|---|
| 广东省建筑安全协会: "《建筑焊工》", 30 September 2018 * |
| 张信林: "《焊工技术问答》", 30 November 2005 * |
| 杨清志: "《焊接技术问答》", 30 April 1988 * |
| 沈璐: "《图解钢结构施工细部做法100讲》", 31 May 2017 * |
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Application publication date: 20210917 |