CN108746948B - Full penetration back chipping-free submerged automatic arc horizontal welding process for T-shaped joint - Google Patents
Full penetration back chipping-free submerged automatic arc horizontal welding process for T-shaped joint Download PDFInfo
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- CN108746948B CN108746948B CN201810636134.0A CN201810636134A CN108746948B CN 108746948 B CN108746948 B CN 108746948B CN 201810636134 A CN201810636134 A CN 201810636134A CN 108746948 B CN108746948 B CN 108746948B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a full penetration back chipping-free submerged automatic arc welding transverse welding process for a T-shaped joint, which comprises the following steps of: s1: processing a 48.5-degree K-shaped symmetrical groove on a web plate, wherein the truncated edge is 1-2 mm; s2: prefabricating a plurality of tack welding grooves on the K-shaped symmetrical grooves at intervals along the thickness direction of the K-shaped symmetrical grooves, wherein the height of the tack welding grooves is 3mm lower than that of the K-shaped symmetrical grooves; s3: assembling the web plate and the wing plate to enable the welding seam position of the T-shaped joint to be a transverse welding position; s4: performing tack welding according to the position of the tack welding groove by adopting a manual electric arc welding method, wherein the welding current is 110-125A, the welding voltage is 20-24V, and the welding speed is 70-110 mm/min; s5: and after the positioning welding is finished, bottoming, filling and capping the K-shaped symmetrical grooves of the web plate and the wing plate by adopting submerged automatic arc welding transverse welding. The invention realizes the back chipping-free automatic welding of the welding line at the full penetration transverse welding position of the T-shaped joint, protects the health of operators, ensures the welding quality and ensures the welding deformation within a controllable range.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a full penetration back chipping-free submerged automatic arc horizontal welding process for a T-shaped joint.
Background
National level key development project-function and technical requirements of a certain ultra-large protective door design: the internal structure is in a grid type, important welding seams such as T-shaped joints of the main rib plate, the front panel and the rear panel are required to be completely melted through, a door body must bear the impact of a large commercial airplane and then can be ensured to normally operate, and the requirement on the impact resistance of the welding structure is very high; the inside major structure design is the latticed, is separated into 8 independent narrow enclosure spaces by the major rib board, and welding work load is very big, because the component operating mode decides the welding position and can only increase the welded degree of difficulty for violently welding the position, and the (noisy, dust, high temperature metal steam, high temperature molten iron splash scald etc.) environment that the back carbon arc gouging was back gouged gouging is totally melted through to T type joint is very abominable, influences operating personnel's health and personal safety. The door body has the overall dimension of 8 meters in width, 8 meters in height and 0.8 meter in thickness, and the welding deformation of a large-sized steel structure is controlled very strictly, so that necessary tools are added in the structure to control the welding deformation, but the operation space is narrower, the operable space of the ultra-large protective door is 720mm in height, 2-4 meters in length and 900-1000 mm in channel width, and the full penetration root-clearing-free submerged automatic welding transverse welding of a T-shaped joint in the narrow closed space becomes a challenge.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art, and provides a full penetration and back chipping-free submerged-arc automatic transverse welding process for a T-shaped joint, which can be operated in a narrow closed space, enables the weld joint at the full penetration and transverse welding position of the T-shaped joint to realize back chipping-free automatic welding, protects the health of operators, ensures the welding quality and ensures the welding deformation within a controllable range.
The invention is realized by the following technical scheme:
the full penetration back chipping-free submerged automatic arc welding transverse welding process for the T-shaped joint is characterized by comprising the following steps of:
s1: processing a 48.5-degree K-shaped symmetrical groove on a web plate, wherein the truncated edge is 1-2 mm;
s2: prefabricating a plurality of tack welding grooves on the K-shaped symmetrical grooves at intervals along the thickness direction of the K-shaped symmetrical grooves, wherein the height of the tack welding grooves is 3mm lower than that of the K-shaped symmetrical grooves;
s3: assembling the web plate and the wing plate to enable the welding seam position of the T-shaped joint to be a transverse welding position;
s4: performing tack welding according to the position of the tack welding groove by adopting a manual electric arc welding method, wherein the welding current is 110-125A, the welding voltage is 20-24V, and the welding speed is 70-110 mm/min;
s5: and after the positioning welding is finished, bottoming, filling and capping the K-shaped symmetrical grooves of the web plate and the wing plate by adopting submerged automatic arc welding transverse welding.
Further, setting a positioning welding groove on the K-shaped symmetrical groove at intervals of 300-600 mm, wherein the length of each positioning welding groove is 100mm, the positioning welding groove is made of the K-shaped symmetrical groove by grinding by 3mm, the groove angle of one surface is unchanged, the groove angle of the front surface is unchanged and is set as a first groove, and the groove angle of the back surface is unchanged and is set as a second groove; each positioning welding groove is one of a first groove and a second groove, and the first grooves and the second grooves are arranged on the K-shaped symmetrical grooves in a mutually staggered mode. By the mode that the first grooves and the second grooves are arranged in a staggered mode, stress during positioning welding can be balanced mutually, and the assembly size is guaranteed.
Further, the process angle of the tack welding groove in step S2 in the thickness direction of the K-shaped symmetrical groove is 30 °.
Further, the step S5 includes the following steps:
s51: backing welding is carried out on the front surface of the K-shaped symmetrical groove;
s52: backing welding is carried out on the back of the K-shaped symmetrical groove;
s53: backing welding the back of the K-shaped symmetrical groove and performing second filling welding;
s54: performing second filling welding on the front surface of the K-shaped symmetrical groove in a bottoming welding mode;
s55: welding the front cover surface of the K-shaped symmetrical groove;
s56: and welding the back cover of the K-shaped symmetrical groove.
Further, the specific steps of step S51 are: the front-face backing welding adopts submerged arc automatic welding, the included angle between a welding wire and a wing plate is 30 degrees, the included angle between the welding wire and a web plate is 40-50 degrees, a welding agent is fully paved on a groove to be welded in advance, the welding current is 500-550A, the welding voltage is 26-27V, and the welding speed is 350 mm/min.
Further, the specific steps of step S52 are: the back of the backing weld is directly welded by adopting submerged automatic welding without back chipping, the included angle between a welding wire and a wing plate is 30 degrees, the included angle between the welding wire and a web plate is 40-50 degrees, a to-be-welded groove is fully paved with a welding agent in advance, the welding current is 500-550A, the welding voltage is 27-28V, and the welding speed is 350 mm/min.
Further, the specific steps of step S53 are: and performing second filling welding on the back bottoming welding, wherein the included angle between the welding wire and the wing plate is 30 degrees, the included angle between the welding wire and the web plate is 40-50 degrees, the welding agent is fully paved on the groove to be welded in advance, the welding current is 570-580A, the welding voltage is 28-29V, and the welding speed is 300-350 mm/min.
Further, the specific steps of step S54 are: and performing second filling welding on the front backing weld, wherein the included angle between the welding wire and the wing plate is 30 degrees, the included angle between the welding wire and the web plate is 40-50 degrees, the welding agent is fully paved on the groove to be welded in advance, the welding current is 570-580A, the welding voltage is 28-29V, and the welding speed is 300-350 mm/min.
Further, the specific steps of step S55 are: the front face cover surface welding seam adopts a layer of two welding angles, the included angle between a welding wire and a wing plate is 65 degrees, the included angle between the welding wire and a web plate is 40-50 degrees, a welding agent is fully paved on a groove to be welded in advance, the welding current is 500-510A, the welding voltage is 29-30V, and the welding speed is 360-380 mm/min.
Further, the specific steps of step S56 are: the welding line of the back cover surface adopts a layer of two welding angles, the included angle between a welding wire and a wing plate is 65-70 degrees, the included angle between the welding wire and a web plate is 40-50 degrees, the welding agent is fully paved with a groove to be welded in advance, the welding current is 500-510A, the welding voltage is 29-30V, and the welding speed is 360-380 mm/min.
The invention has the beneficial effects that:
(1) the full penetration and back chipping-free submerged automatic arc welding transverse welding process for the T-shaped joint solves the problem of difficult operation of the submerged automatic arc welding transverse welding in a narrow closed space, avoids a back chipping process, a back liner or a backing and an installation process thereof in the welding process, omits a carbon arc rod, reduces the use of polishing sheets, and improves the welding production efficiency by nearly 6 times compared with the traditional manual electric arc welding back chipping and full penetration welding process;
(2) according to the invention, the submerged automatic welding transverse welding is adopted in the narrow closed space, the huge investment of displacement equipment is not needed, the production cost is saved, the submerged automatic welding transverse welding is adopted in the narrow closed space to replace manual electric arc welding, the labor intensity of welding personnel is reduced, meanwhile, the consumption of welding materials and related articles is reduced, and the working time cost is saved;
(3) the invention avoids the environmental pollution of back carbon arc gouging back chipping and the risk of scalding by high-temperature molten iron in a narrow closed space, particularly greatly improves the environment of a production field and realizes the protection of the health of workers because the noise is reduced and the generation of harmful gas is reduced;
(4) the invention ensures the welding quality of the full penetration transverse welding seam in the narrow closed space and lays a welding technical foundation for the successful development of a national level key project 'a certain ultra-large protection door'.
For a better understanding and practice, the invention is described in detail below with reference to specific embodiments.
Drawings
FIG. 1 is a partial side view of a web with a symmetrical groove of the K-type of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
FIG. 4 is a schematic view of the angle of the welding wire of the present invention with the wing;
FIG. 5 is an enlarged schematic view at I of FIG. 4;
wherein: 1-web plate, 11-K-shaped symmetrical groove, 111-first groove, 112-second groove, 2-wing plate and 3-welding wire.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
The method is implemented by taking a certain ultra-large protective door product which is just developed as an embodiment, the overall dimension of the ultra-large protective door product is 8000mm wide, 8000mm high and 800mm thick, the thickness of a plate is 25mm/40mm, and the material Q345B is further described in detail by combining the attached drawings. The present embodiment is implemented on the basis of the product by using the following welding method, which aims to better understand the content of the method and does not limit the protection scope of the patent application. Referring to fig. 1 to 5, the full penetration back-gouging-free submerged automatic arc horizontal welding process method for the T-shaped joint of the embodiment is as follows:
s1: a 48.5-degree K-shaped symmetrical groove 11 with a truncated edge of 1-2mm is processed on the web plate 1;
s2: performing tack welding groove prefabrication on the K-shaped symmetrical groove 11 at intervals of 400mm along the thickness direction of the K-shaped symmetrical groove 11, wherein the process angle is 30 degrees, the length of each tack welding groove is 100mm, the tack welding groove is made of the K-shaped symmetrical groove 11 by grinding by 3mm, the groove angle of one surface is unchanged, the groove angle of the front surface is set as a first groove 111, and the groove angle of the back surface is unchanged as a second groove 112; each positioning welding groove is one of a first groove 111 and a second groove 112, and the positioning welding grooves are arranged on the K-shaped symmetrical grooves 11 in a mutually staggered mode according to the first grooves 111 and the second grooves 112;
s3: assembling the web plate 1 and the wing plate 2 to enable the welding seam position of the T-shaped joint to be a transverse welding position;
s4: performing tack welding according to the position of the tack welding groove by adopting a manual arc welding method, wherein the welding current is 120A, the welding voltage is 22V, and the welding speed is 100 mm/min;
s5: after the positioning welding is finished, bottoming, filling and capping are carried out on the K-shaped symmetrical groove 11 of the web plate 1 and the wing plate 2 by adopting submerged automatic arc welding transverse welding, and the method specifically comprises the following steps:
s51: backing welding is carried out on the front surface of the K-shaped symmetrical groove: adopting submerged arc automatic welding, wherein an included angle between a welding wire 3 and a wing plate 2 is 30 degrees (figure 4), an included angle between the welding wire 3 and a web plate 1 is 40 degrees (not shown), a welding agent is paved on a groove to be welded in advance, the welding current is 550A, the welding voltage is 26V, and the welding speed is 350 mm/min;
s52: backing welding is carried out on the back of the K-shaped symmetrical groove: adopting submerged automatic welding for direct welding without back chipping on the back surface of backing weld, wherein an included angle between a welding wire 3 and a wing plate 2 is 30 degrees (figure 4), and an included angle between the welding wire 3 and a web plate 1 is 40 degrees (not shown), a welding agent is fully paved on a groove to be welded in advance, the welding current is 550A, the welding voltage is 27V, and the welding speed is 350 mm/min;
s53: backing up the back of the K-shaped symmetrical groove and performing second filling welding: the included angle of the welding wire 3 and the wing plate 2 is 30 degrees (figure 4), the included angle of the welding wire 3 and the web plate 1 is 40 degrees (not shown), a welding agent is paved in advance on a groove to be welded, the welding current is 570A, the welding voltage is 28V, and the welding speed is 300 mm/min;
s54: and (3) performing second filling welding on the front surface of the K-shaped symmetrical groove by backing welding: the included angle of the welding wire 3 and the wing plate 2 is 30 degrees (figure 4), the included angle of the welding wire 3 and the web plate 1 is 40 degrees (not shown), a welding agent is paved in advance on a groove to be welded, the welding current is 570A, the welding voltage is 28V, and the welding speed is 300 mm/min;
s55: welding the front cover surface of the K-shaped symmetrical groove: the front face cover surface welding seam adopts a layer of two welding angles, the included angle between a welding wire 3 and a wing plate 2 is 65 degrees (not shown), the included angle between the welding wire 3 and a web plate 1 is 40 degrees (not shown), a welding flux is fully paved on a groove to be welded in advance, the welding current is 500A, the welding voltage is 29V, and the welding speed is 360 mm/min;
s56: welding the back cover surface of the K-shaped symmetrical groove: the back cover welding seam adopts a layer of two welding angles, the included angle between a welding wire 3 and a wing plate 2 is 65 degrees (not shown) and the included angle between the welding wire 3 and a web plate 1 is 40 degrees (not shown), a welding agent is fully paved on a groove to be welded in advance, the welding current is 500A, the welding voltage is 29V, and the welding speed is 360 mm/min.
Example 2
The full penetration back chipping-free submerged automatic arc welding transverse welding process method for the T-shaped joint in the embodiment is operated as follows:
s1: processing a 48.5-degree K-shaped symmetrical groove on a web plate, wherein the truncated edge is 1-2 mm;
s2: prefabricating a plurality of positioning welding grooves on the K-shaped symmetrical grooves at intervals of 300mm along the thickness direction of the K-shaped symmetrical grooves, wherein the height of the positioning welding grooves is 3mm lower than that of the K-shaped symmetrical grooves, and the groove angle of one surface of each positioning welding groove is unchanged;
s3: assembling the web plate and the wing plate to enable the welding seam position of the T-shaped joint to be a transverse welding position;
s4: performing tack welding according to the position of the tack welding groove by adopting a manual arc welding method, wherein the welding current is 110A, the welding voltage is 20V, and the welding speed is 70 mm/min;
s5: and after the positioning welding is finished, bottoming, filling and capping the K-shaped symmetrical grooves of the web plate and the wing plate by adopting submerged automatic arc welding transverse welding.
Example 3
The full penetration back chipping-free submerged automatic arc welding transverse welding process method for the T-shaped joint of the embodiment is operated as follows:
s1: processing a 48.5-degree K-shaped symmetrical groove on a web plate, wherein the truncated edge is 1-2 mm;
s2: performing tack welding groove prefabrication on the K-shaped symmetrical grooves at intervals of 600mm along the thickness direction of the K-shaped symmetrical grooves, wherein the length of each tack welding groove is 100mm, the tack welding groove is made of K-shaped symmetrical grooves by grinding down by 3mm, the groove angle of one surface is unchanged, the groove angle of the front surface is set as a first groove, and the groove angle of the back surface is unchanged as a second groove; each positioning welding groove is one of a first groove and a second groove, and the first grooves and the second grooves are arranged on the K-shaped symmetrical grooves in a mutually staggered mode;
s3: assembling the web plate and the wing plate to enable the welding seam position of the T-shaped joint to be a transverse welding position;
s4: performing tack welding according to the position of the tack welding groove by adopting a manual arc welding method, wherein the welding current is 125A, the welding voltage is 24V, and the welding speed is 110 mm/min;
s5: after the positioning welding is finished, bottoming, filling and capping are carried out on the K-shaped symmetrical grooves of the web plate and the wing plate by adopting submerged automatic arc welding transverse welding, and the method specifically comprises the following steps:
s51: backing welding is carried out on the front surface of the K-shaped symmetrical groove: adopting submerged arc automatic welding, wherein the included angle between a welding wire and a wing plate is 30 degrees, the included angle between the welding wire and a web plate is 50 degrees, a welding flux is paved on a groove to be welded in advance, the welding current is 500A, the welding voltage is 27V, and the welding speed is 350 mm/min;
s52: backing welding is carried out on the back of the K-shaped symmetrical groove: adopting submerged automatic welding for direct welding without back chipping on the back surface of the backing weld, wherein the included angle between a welding wire and a wing plate is 30 degrees and the included angle between the welding wire and a web plate is 50 degrees, a welding agent is fully paved on a groove to be welded in advance, the welding current is 500A, the welding voltage is 28V, and the welding speed is 350 mm/min;
s53: backing up the back of the K-shaped symmetrical groove and performing second filling welding: the included angle between the welding wire and the wing plate is 30 degrees, the included angle between the welding wire and the web plate is 50 degrees, the welding agent is fully paved on a groove to be welded in advance, the welding current is 580A, the welding voltage is 29V, and the welding speed is 350 mm/min;
s54: and (3) performing second filling welding on the front surface of the K-shaped symmetrical groove by backing welding: the included angle between the welding wire and the wing plate is 30 degrees, the included angle between the welding wire and the web plate is 50 degrees, the welding agent is fully paved on a groove to be welded in advance, the welding current is 580A, the welding voltage is 29V, and the welding speed is 350 mm/min;
s55: welding the front cover surface of the K-shaped symmetrical groove: the front face cover surface welding seam adopts a layer of two welding starting angles, the included angle between a welding wire and a wing plate is 70 degrees, the included angle between the welding wire and a web plate is 50 degrees, a welding flux is fully paved on a groove to be welded in advance, the welding current is 510A, the welding voltage is 30V, and the welding speed is 380 mm/min;
s56: welding the back cover surface of the K-shaped symmetrical groove: the back cover welding seam adopts a layer of two welding angles, the included angle between a welding wire and a wing plate is 70 degrees, the included angle between the welding wire and a web plate is 50 degrees, a welding agent is fully paved on a groove to be welded in advance, the welding current is 510A, the welding voltage is 30V, and the welding speed is 380 mm/min.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
- The full penetration back chipping-free submerged automatic arc welding transverse welding process for the T-shaped joint is characterized by comprising the following steps of:s1: processing a 48.5-degree K-shaped symmetrical groove on a web plate, wherein the truncated edge is 1-2 mm;s2: prefabricating a plurality of tack welding grooves on the K-shaped symmetrical grooves at intervals along the thickness direction of the K-shaped symmetrical grooves, wherein the height of the tack welding grooves is 3mm lower than that of the K-shaped symmetrical grooves;s3: assembling the web plate and the wing plate to enable the welding seam position of the T-shaped joint to be a transverse welding position;s4: performing tack welding according to the position of the tack welding groove by adopting a manual electric arc welding method, wherein the welding current is 110-125A, the welding voltage is 20-24V, and the welding speed is 70-110 mm/min;s5: and after the positioning welding is finished, bottoming, filling and capping the K-shaped symmetrical grooves of the web plate and the wing plate by adopting submerged automatic arc welding transverse welding.
- 2. The T-shaped joint full penetration back-chipping-free submerged automatic arc welding transverse welding process according to claim 1, characterized in that: arranging a tack welding groove on the K-shaped symmetrical grooves at intervals of 300-600 mm, wherein the length of each tack welding groove is 100mm, the tack welding groove is made of K-shaped symmetrical grooves which are ground by 3mm, the angle of the groove on one surface is unchanged, the angle of the groove on the front surface is set as a first groove, and the angle of the groove on the back surface is set as a second groove; each positioning welding groove is one of a first groove and a second groove, and the first grooves and the second grooves are arranged on the K-shaped symmetrical grooves in a mutually staggered mode.
- 3. The T-shaped joint full penetration back-chipping-free submerged automatic arc welding transverse welding process according to claim 1, characterized in that: the process angle of the tack welding groove in step S2 in the thickness direction of the K-shaped symmetrical groove is 30 °.
- 4. The T-shaped joint full penetration back-chipping-free submerged automatic arc welding transverse welding process according to claim 1, characterized in that: the step S5 includes the steps of:s51: backing welding is carried out on the front surface of the K-shaped symmetrical groove;s52: backing welding is carried out on the back of the K-shaped symmetrical groove;s53: backing welding the back of the K-shaped symmetrical groove and performing second filling welding;s54: performing second filling welding on the front surface of the K-shaped symmetrical groove in a bottoming welding mode;s55: welding the front cover surface of the K-shaped symmetrical groove;s56: and welding the back cover of the K-shaped symmetrical groove.
- 5. The T-shaped joint full penetration back-chipping-free submerged automatic arc horizontal welding process according to claim 4, characterized in that: the specific steps of step S51 are: the front-face backing welding adopts submerged arc automatic welding, the included angle between a welding wire and a wing plate is 30 degrees, the included angle between the welding wire and a web plate is 40-50 degrees, a welding agent is fully paved on a groove to be welded in advance, the welding current is 500-550A, the welding voltage is 26-27V, and the welding speed is 350 mm/min.
- 6. The T-shaped joint full penetration back-chipping-free submerged automatic arc horizontal welding process according to claim 4, characterized in that: the specific steps of step S52 are: the back of the backing weld is directly welded by adopting submerged automatic welding without back chipping, the included angle between a welding wire and a wing plate is 30 degrees, the included angle between the welding wire and a web plate is 40-50 degrees, a groove to be welded is fully paved with a welding agent in advance, the welding current is 500-550A, the welding voltage is 27-28V, and the welding speed is 350 mm/min.
- 7. The T-shaped joint full penetration back-chipping-free submerged automatic arc horizontal welding process according to claim 4, characterized in that: the specific steps of step S53 are: and performing second filling welding on the back bottoming welding, wherein the included angle between the welding wire and the wing plate is 30 degrees, the included angle between the welding wire and the web plate is 40-50 degrees, the welding agent is fully paved on the groove to be welded in advance, the welding current is 570-580A, the welding voltage is 28-29V, and the welding speed is 300-350 mm/min.
- 8. The T-shaped joint full penetration back-chipping-free submerged automatic arc horizontal welding process according to claim 4, characterized in that: the specific steps of step S54 are: and performing second filling welding on the front backing weld, wherein the included angle between the welding wire and the wing plate is 30 degrees, the included angle between the welding wire and the web plate is 40-50 degrees, the welding agent is fully paved on the groove to be welded in advance, the welding current is 570-580A, the welding voltage is 28-29V, and the welding speed is 300-350 mm/min.
- 9. The T-shaped joint full penetration back-chipping-free submerged automatic arc horizontal welding process according to claim 4, characterized in that: the specific steps of step S55 are: the front face cover surface welding seam adopts a layer of two welding angles, the included angle between a welding wire and a wing plate is 65 degrees, the included angle between the welding wire and a web plate is 40-50 degrees, a welding agent is fully paved on a groove to be welded in advance, the welding current is 500-510A, the welding voltage is 29-30V, and the welding speed is 360-380 mm/min.
- 10. The T-shaped joint full penetration back-chipping-free submerged automatic arc horizontal welding process according to claim 4, characterized in that: the specific steps of step S56 are: the welding line of the back cover surface adopts a layer of two welding angles, the included angle between a welding wire and a wing plate is 65-70 degrees, the included angle between the welding wire and a web plate is 40-50 degrees, the welding agent is fully paved with a groove to be welded in advance, the welding current is 500-510A, the welding voltage is 29-30V, and the welding speed is 360-380 mm/min.
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| CN112157334A (en) * | 2020-09-28 | 2021-01-01 | 江南造船(集团)有限责任公司 | Deep-melting submerged-arc automatic fillet welding method for large thick plate |
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| CN101081460A (en) * | 2007-03-26 | 2007-12-05 | 南阳二机石油装备(集团)有限公司 | Large-sized T shaped joint full penetration assembled welding process |
| CN102950370B (en) * | 2012-10-23 | 2015-11-04 | 山东中通钢构建筑股份有限公司 | A kind of H profile steel submerged welding process method of welding web thickness and being greater than 16mm |
| CN104625357A (en) * | 2013-11-15 | 2015-05-20 | 上海中远川崎重工钢结构有限公司 | H-steel or T-steel full-penetration back-gouging-free welding method |
| CN105081595A (en) * | 2015-02-04 | 2015-11-25 | 上海船舶工艺研究所 | Fillet weld welding structure for K-type grooves of moderately-thick plate without back chipping and welding technology of fillet weld welding structure |
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