CN-122007732-A - Automatic welding method for steel corner areas of main screen wall of cargo surrounding system of LNG transport ship

Abstract

The automatic welding method for the steel corner area of the main screen wall of the cargo surrounding system of the LNG transport ship solves the inherent limitations that a series of manual argon arc welding is used for finishing lap welding of corrugated plates, and the like, wherein the production efficiency of the steel corner area of the main screen wall is low, the argon arc welding operation level of welding workers is highly dependent, the manual welding quality stability is poor, the post-welding repair cost is high, and the like.

Inventors

• MAO HAIBO
• ZHANG HE
• ZHU DAWEI
• ZENG YUE
• WANG LEI
• CHENG LONG
• ZHAO YUNXIAO
• ZHANG TONGHE
• TONG ZIYUAN
• GUAN JIAN
• QIAN XUEWEI
• FANG MING
• FENG WEI
• HE YULIANG
• QU ZHI
• HUANG RONGGANG
• QIN MING

Assignees

• 大连船舶重工集团有限公司

Dates

Publication Date

20260512

Application Date

20260212

Claims (9)

1. 1. An automatic welding method for a steel corner area of a main screen wall of a cargo surrounding system of an LNG transport ship is characterized in that an angle-adjustable supporting member is needed, the angle-adjustable supporting member is provided with a side supporting plate and a bottom supporting plate, edges of the side supporting plate and the bottom supporting plate are in butt joint to form an included angle, an angle measuring ruler is fixed at the included angle, and an automatic welding track is fixed on the bottom supporting plate; the whole angle measuring ruler is arc-shaped and comprises an arc-shaped sleeve and an arc-shaped inner ruler inserted into the sleeve, wherein the arc-shaped inner ruler stretches back and forth in the sleeve and is fixed through a locking bolt; the back surfaces of the side support plates and the bottom support plates are fixedly provided with locking pieces, the locking pieces are in butt joint with steel corner bolts on steel corners, and the angle-adjustable support members are fixedly connected with the steel corners; The plurality of angle-adjustable supporting members are used simultaneously and are continuously fixed on the steel corners, and when in connection, the angle measuring scale is adjusted to enable the included angle between the side supporting plates and the bottom supporting plates to be the same as the angle of the current angle area connecting piece; the locking piece at the back of the bottom supporting plate is rotated to adjust the levelness of the bottom supporting plate to 100mm plus or minus 2mm, and the automatic welding tracks on the plurality of bottom supporting plates are connected end to end in sequence to form a complete automatic welding track; After welding, the angle-adjustable supporting member is removed, after the welding bead is cooled, a polishing operator polishes and polishes the welding bead oxide layer by using an electric polisher, and a dust collector is used for comprehensively cleaning the station after polishing.
2. 2. An automatic welding method for a steel corner area of a main screen wall of a cargo enclosure system of an LNG carrier according to claim 1, wherein the angle measuring scale is 90 °, 135 °, 108.4 ° and 161.6 °.
3. 3. The automatic welding method for steel corner areas of main screen walls of cargo systems of LNG transport ships according to claim 1, wherein the locking part main body is a hollow cylinder, nuts are fixed at two ends of the cylinder, connecting bolts are fixed at the back parts of the side support plates and the bottom support plates, the connecting bolts are connected with the nuts at one end of the cylinder, and the steel corner bolts are connected with the nuts at the other end of the cylinder; And rotating the cylinder, and simultaneously advancing or retreating the connecting bolt and the steel corner bolt to connect or detach the angle-adjustable supporting member with or from the steel corner.
4. 4. The automatic welding method for steel corner areas of main screen walls of cargo systems of LNG transport ships according to claim 1, wherein arc extinguishing magnetic attraction sensors are arranged at the tail ends of the automatic welding tracks.
5. 5. An automatic welding method for steel corner areas of main screen walls of cargo systems of LNG carriers according to claim 1, characterized in that before operation, the surface of the boundary corrugated plate is inspected for damage and the welding area is cleaned with acetone, requiring no oil and dust.
6. 6. An automatic welding method for steel corner areas of main screen walls of cargo systems of LNG carriers according to claim 1, characterized in that the steel corners are made of 8mm stainless steel plates.
7. 7. The automatic welding method for steel corner areas of main screen walls of cargo systems of LNG transport ships according to claim 1, wherein edges of corrugated plates are lapped on the steel corners to form welding beads, and the parallelism between the bottom supporting plates and the welding beads is required to reach 185+/-8 mm.
8. 8. An automatic welding method for steel corner areas of main screen walls of cargo systems of LNG carriers according to claim 1, characterized in that the thickness of the corrugated plate is 1.2mm.
9. 9. The automatic welding method for steel corner areas of main screen walls of cargo systems of LNG transport ships according to claim 1, wherein the surfaces of the arc-shaped inner ruler are provided with angle scales, and the arc-shaped sleeve is made of transparent materials.

Description

Automatic welding method for steel corner areas of main screen wall of cargo surrounding system of LNG transport ship Technical Field The invention belongs to the field of marine ship construction and design, and particularly relates to an automatic welding method for a steel corner area of a main screen wall of a cargo surrounding system of an LNG transport ship. Background At present, in the field of marine ship manufacturing, the technology of a Mark III film type cargo containment system of a French GTT is commonly adopted in the construction technology of an LNG transport ship, the same type of ultra-thin plate automatic welding between 304L adjacent stainless steel corrugated plates of a main wall layer of a cargo containment system in a cabin is realized in the industry, however, the position of a steel corner area of the main wall layer of the cargo containment system in the cabin needs to be welded on 304L stainless steel of 8mm in a lap joint mode, the area is an included angle position of any two surfaces in the cabin, the space of the included angle position is limited, the automatic welding equipment cannot be directly assembled, the adjacent included angle position interferes with the external dimension of the automatic welding equipment, the traditional automatic welding machine assembly method can cause the automatic welding equipment to collide with a steel corner body and a bolt on the steel corner, the cable of a welding gun is connected with the automatic welding equipment to scratch the corrugated plates at the adjacent included angle position, so that the surface of the corrugated plates is damaged, and manual cutting repair operation is further brought. In addition, the angles of the included angle positions of the main screen steel corner regions are not uniform, and according to the fact that the included angle positions of the steel corners in the cabin are 90 degrees, 135 degrees, 108.4 degrees and 161.6 degrees, the automatic welding equipment cannot be effectively compatible with the automatic welding operation of non-uniform welding regions. In the ship manufacturing enterprises adopting the Mark III film type cargo containment system technology of the GTT in the LNG transport ship construction field, corrugated plate lap welding is completed in a steel corner area of a main screen wall of the cargo containment system in a manual argon arc welding mode, the production efficiency of the steel corner area of the main screen wall is low in manual argon arc welding, the dependence on the argon arc welding operation proficiency of welding workers is high, the quality stability of the lap welding of the corrugated plate in the steel corner area is poor, the obvious production cost of manual work, post-welding repair and the like is high, and the construction period of the cargo containment system of the LNG transport ship is long. The quality of an automatic welding bead meets the detection standard of a GTT M1303, and the once welding qualification rate is stabilized to be more than 99%, so that the welding construction of a main screen steel corner area is manually upgraded from a welder to an automatic welding production mode of equipment mainly used for automatic welding by technical upgrading, method innovation and tool research and development in the industry. Disclosure of Invention In order to solve the problems, the invention provides an automatic welding method for a steel corner area of a main screen wall of a cargo surrounding system of an LNG transport ship, which aims to achieve the aim that the limited included angle positions of any two surfaces in the steel corner area and a cabin of the main screen wall can be automatically welded, and adopts the following technical scheme: An automatic welding method for a steel corner area of a main screen wall of a cargo surrounding system of an LNG transport ship needs to use an angle-adjustable supporting member, wherein the angle-adjustable supporting member is provided with a side supporting plate and a bottom supporting plate, edges of the side supporting plate and the bottom supporting plate are in butt joint to form an included angle, an angle measuring ruler is fixed at the included angle, and an automatic welding track is fixed on the bottom supporting plate; the whole angle measuring ruler is arc-shaped and comprises an arc-shaped sleeve and an arc-shaped inner ruler inserted into the sleeve, wherein the arc-shaped inner ruler stretches back and forth in the sleeve and is fixed through a locking bolt; the back surfaces of the side support plates and the bottom support plates are fixedly provided with locking pieces, the locking pieces are in butt joint with steel corner bolts on steel corners, and the angle-adjustable support members are fixedly connected with the steel corners; The plurality of angle-adjustable supporting members are used simultaneously and are continuously fixed on the steel corners, and when in conne