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CN-122007694-A - Box-type arm support and welding method thereof

CN122007694ACN 122007694 ACN122007694 ACN 122007694ACN-122007694-A

Abstract

The embodiment of the application provides a box-type arm support and a welding method thereof. The method comprises the steps of pre-fixing a first side plate, a second side plate, a third side plate and a fourth side plate through a retainer, enabling the first side plate to be opposite to the second side plate, enabling the third side plate to be opposite to the fourth side plate, welding and fixing the first side plate and the third side plate through a ship type welding mode, welding and fixing the second side plate and the fourth side plate through a ship type welding mode, welding and fixing the second side plate and the third side plate through a ship type welding mode, and welding and fixing the first side plate and the fourth side plate through a ship type welding mode. According to the application, the welding sequence is set to be that one group of opposite angles of the side plates are welded firstly and the other group of opposite angles are welded, so that the welding sequence can quickly form a stable basic frame structure, and the initial symmetrical balance of welding heat input and shrinkage stress is realized macroscopically.

Inventors

  • Dai xili
  • LIU FENGYU
  • KANG JUNXIAN
  • XIE ZHIZHOU
  • YU CHENGFENG
  • WANG WENHUA

Assignees

  • 中国铁建重工集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260320

Claims (10)

  1. 1. The welding method of the box-type arm support is characterized by comprising the following steps of: pre-fixing a first side plate (110), a second side plate (120), a third side plate (130) and a fourth side plate (140) through a retainer (200) so that the first side plate (110) is arranged opposite to the second side plate (120), and the third side plate (130) is arranged opposite to the fourth side plate (140); The first side plate (110) and the third side plate (130) are welded and fixed in a ship-shaped welding mode, and the second side plate (120) and the fourth side plate (140) are welded and fixed in a ship-shaped welding mode; The second side plate (120) and the third side plate (130) are welded and fixed by a ship-shaped welding mode, and the first side plate (110) and the fourth side plate (140) are welded and fixed by a ship-shaped welding mode.
  2. 2. The welding method of a box boom according to claim 1, characterized in that the first side plate (110) and the third side plate (130) are formed with filling grooves (150), the cross-sectional width of the filling grooves (150) gradually increases from the bottom of the filling grooves (150) to the notch (151) of the filling grooves (150); -welding the first side plate (110) and the third side plate (130) by means of a ship type welding, comprising: forming a priming layer (310) in the filling groove (150), wherein the priming layer (310) is filled at the bottom of the filling groove (150); a cover layer (330) is formed on the bottom layer (310), and at least part of the cover layer (330) extends out of the notch (151) of the filling groove (150).
  3. 3. The welding method of a box boom according to claim 2, wherein the thickness of the first side plate (110) and the thickness of the third side plate (130) are less than or equal to 8mm, and the cover layer (330) is attached to the base layer (310).
  4. 4. The welding method of the box arm support according to claim 2, wherein the priming layer (310) is formed in the filling groove (150), the priming layer (310) is welded by adopting a small-amplitude saw-tooth swing welding head (410), the swing frequency is 2.5 hertz, the swing width is 2.5 millimeters, and the welding speed is 20-35 cm/min.
  5. 5. The welding method of the box arm support according to claim 2, wherein the cover layer (330) is welded by adopting a small-amplitude saw-tooth swing welding head (410), the swing frequency is 2.5 hertz, the swing width is 3 millimeters, and the welding speed is 30cm/min.
  6. 6. The welding method of a box boom according to claim 2, characterized in that the thickness of the first side plate (110) and the thickness of the third side plate (130) are greater than 8 mm; Before the base layer (310) forms the cover layer (330), the welding method includes: -forming a filling layer (320) on the primer layer (310), the filling layer (320) covering the primer layer (310).
  7. 7. The welding method of the box arm support according to claim 6, wherein the filling layer (320) is welded by adopting a small-amplitude sawtooth swing welding head (410), the swing frequency is 2.5 hertz, the swing width is 4.2-4.5 millimeters, and the welding speed is 25-45 cm/min.
  8. 8. The welding method of a box boom according to any of claims 1 to 7, characterized in that the first side plate (110), the second side plate (120), the third side plate (130) and the fourth side plate (140) are pre-fixed by a retainer (200), comprising: the first side plate (110), the second side plate (120), the third side plate (130) and the fourth side plate (140) are installed through a tool, the first side plate (110) and the second side plate (120) are arranged oppositely, and the third side plate (130) and the fourth side plate (140) are arranged oppositely; The retainer (200) is arranged in an inner space surrounded by a plurality of side plates, the retainer (200) is respectively and tightly attached to the inner walls of the side plates, and temporary fixation of the retainer (200) and each side plate is realized through spot welding.
  9. 9. A box boom (100), characterized in that it is produced by a box boom (100) welding method according to any of claims 1-8.
  10. 10. The box boom (100) of claim 1, wherein the box boom (100) comprises a plurality of side panels including the first side panel (110), the second side panel (120), the third side panel (130), and the fourth side panel (140); a filling groove (150) is formed between two adjacent side plates, and the cross section width of the filling groove (150) is gradually increased from the bottom of the filling groove (150) to a notch (151) of the filling groove (150); A priming layer (310), a filling layer (320) and a covering layer (330) which are sequentially stacked from the bottom of the filling groove (150) to the notch (151) are arranged in the filling groove, and the priming layer (310) is arranged at the bottom of the filling groove (150) and is used for blocking the filling groove (150) and providing basic positioning and structural strength for subsequent welding; the filling layer (320) has a higher rigidity than the base layer (310) and the cover layer (330), At least part of the cover layer (330) extends out of the notch (151), and the cover layer (330) is provided with a smooth surface.

Description

Box-type arm support and welding method thereof Technical Field The application relates to the technical field of engineering machinery, in particular to a box-shaped arm support and a welding method thereof. Background In the manufacturing process of the box-type arm support structure, welding is a key process link for determining the final quality and the dimensional accuracy of a product. However, if the welding process parameters are not reasonably set or well matched with the structural characteristics, internal defects such as poor welding seam fusion, air holes, slag inclusion and the like are easily caused, and more prominent welding deformation problems are easily caused. In the related art, although a plurality of improvements are proposed, the related art still has a limitation in practical application, that is, the related art focuses on the local optimization of a specific joint form or a filling groove design, and lacks the overall deformation control capability. Although the welding seam quality is improved, the problem of macroscopic integral deformation of the box-type arm support caused by the accumulation and mutual constraint of welding deformation of multiple components such as a cover plate, a web plate and a partition plate cannot be solved systematically. In addition, the related welding process method is generally set for a single plate thickness, and lacks a coordinated control strategy applicable to multiple plate thickness conditions in the same arm support structure, so that accurate regulation and control on welding deformation of a complex box-type arm support are difficult to realize. Disclosure of Invention The embodiment of the application provides a box-type arm support and a welding method thereof, which can integrally regulate and control welding deformation accumulation of multiple components and adapt to a coordinated control scheme of multiple plate thickness working conditions in the same arm support so as to realize accurate control of welding deformation. The welding deformation control method is used for solving the problems that the welding deformation control of the box-type arm support lacks systematicness and the process strategy universality is insufficient. In a first aspect, an embodiment of the present application provides a method for welding a box arm support, including: the first side plate, the second side plate, the third side plate and the fourth side plate are pre-fixed through the retainer, so that the first side plate and the second side plate are arranged oppositely, and the third side plate and the fourth side plate are arranged oppositely; The first side plate and the third side plate are welded and fixed through a ship-shaped welding mode, the second side plate and the fourth side plate are welded and fixed through a ship-shaped welding mode, the second side plate and the third side plate are welded and fixed through a ship-shaped welding mode, and the first side plate and the fourth side plate are welded and fixed through a ship-shaped welding mode. According to the application, the welding sequence is set to be that one group of opposite angles of the side plates are welded firstly and the other group of opposite angles are welded, so that the welding sequence can quickly form a stable basic frame structure, and the initial symmetrical balance of welding heat input and shrinkage stress is realized macroscopically. In one possible embodiment, the first side plate and the third side plate are formed with filling grooves, and the cross-sectional widths of the filling grooves gradually increase from the bottoms of the filling grooves to the notches of the filling grooves. The filling grooves are directly formed at the ends of the side plates, so that the process of independently chamfering can be omitted, the preparation process is simplified, and the material utilization rate is improved. The first side plate and the third side plate are welded and fixed in a ship-shaped welding mode, and the welding method comprises the steps of forming a priming layer in the filling groove, filling the priming layer at the bottom of the filling groove, ensuring the root of the filling groove to be fully melted, and providing basic positioning and structural strength for subsequent welding. A cover layer is formed on the priming layer, and at least part of the cover layer extends out of the notch of the filling groove. Ensures that the welding seam is beautiful and uniform in size, and eliminates welding defects such as undercut, weld flash, unfused and the like. In one possible embodiment, the thickness of the first side plate and the thickness of the third side plate are less than or equal to 8 millimeters, and the cover layer is attached to the base layer. On the premise of ensuring the welding strength, the number of welding layers is reduced, the overall heat input is reduced, the welding shrinkage and welding deformation are effectively reduced, and the