CN-117206636-B - Anti-conventional assembly welding manufacturing method for dense structure

CN117206636BCN 117206636 BCN117206636 BCN 117206636BCN-117206636-B

Abstract

The invention discloses a dense structure anti-conventional assembly welding manufacturing method, which is used for realizing the welding of a full penetration t-type butt weld between a dense plate and a metal mother plate, wherein the thickness of the dense plate is not less than 26mm, one side of the dense plate is provided with a barrier plate, the ratio of the height of the barrier plate to the distance from any point on the barrier plate to the dense plate is not less than tan52 degrees, the distance from any point on the barrier plate to the dense plate is not greater than the distance for welding equipment or people to pass through, the method comprises the steps of setting the cutting angle and the depth of an inner groove and an outer groove, adopting an inner shallow groove to weld firstly, and adopting an outer deep groove side back chipping and then welding method to weld.

Inventors

JIANG HAITAO
PAN WENMING
HU XUEJUN
LIU JIANFENG

Assignees

中交二航局结构工程有限公司

Dates

Publication Date: 20260508
Application Date: 20231007

Claims (4)

1. The reverse conventional assembly welding manufacturing method for the dense structure is characterized by being used for realizing the welding of a full penetration t-type butt welding seam between a dense plate and a metal mother plate, wherein the thickness of the dense plate is not less than 26mm, one side of the dense plate is provided with a barrier plate, the ratio of the height of the barrier plate to the distance from any point on the barrier plate to the dense plate is tan 52-tan 60 degrees, and the distance from any point on the barrier plate to the dense plate is not more than the distance for welding equipment or people to pass through; the anti-conventional assembly welding manufacturing method comprises the following steps of: (1) Cutting an inner groove on one side of the edge of the butt joint of the dense sheet and the metal motherboard facing the barrier sheet, cutting an outer groove on the other side of the edge, wherein the cutting angle of the inner groove is set to ensure that the tangent value of the cutting angle is larger than the ratio and not larger than tan 60 DEG, the depth of the inner groove is 1/4 of the thickness of the dense sheet, a blunt edge with the thickness of 4mm is reserved between the inner groove and the outer groove of the dense sheet, the cutting angle of the outer groove is 45 DEG, and the depth of the outer groove is the residual value of the thickness of the dense sheet; (2) And the welding is performed by adopting a method of firstly welding an inner side shallow groove and then back chipping and welding an outer side deep groove.
2. The method for manufacturing the dense structure anti-conventional assembly welding according to claim 1, wherein the depth of the inner groove is set to 10mm when the cutting angle of the inner groove is 60 degrees and the thickness of the dense plate is 40 mm.
3. The method for manufacturing the dense structure inverse conventional welding according to claim 2, wherein the cutting angle of the outer groove is 45 degrees, and the depth of the outer groove is 26mm.
4. The method for manufacturing the dense structure anti-conventional welding according to any one of claims 1 to 3, wherein the welding in the step (2) is performed by adopting CO 2 gas shielded welding, the welding seam is performed by adopting layered and lane-separated intermittent welding, and the filling amount of each welding seam is 1/3 to 1/2 of that of the welding seam.

Description

Anti-conventional assembly welding manufacturing method for dense structure Technical Field The invention relates to the technical field of steel structure manufacturing and welding, in particular to an anti-conventional welding manufacturing method for a dense structure. Background The dense structures in welding refer to closely-arranged structures formed during welding, and the continuity and strength of the dense structures and the welded structures of the base metals are very important. The steel structure bridge steel anchor box is a dense structure in steel manufacture, the anchor box structure is arranged in an outer side area where the side web falls, the anchor box mainly comprises an anchor backing plate, an anchor lower bearing plate, a force transmission web, a stiffening plate and an anchor pipe, the anchor backing plate is welded on one side of the anchor lower bearing plate and provided with a through center through hole for penetrating through a stay cable, the force transmission web is vertically welded on the other side of the anchor lower bearing plate at intervals, the stiffening plate is vertically arranged along the outer wall of the force transmission web and extends along the height direction of the force transmission web, the stiffening plate is arranged in parallel at intervals along the width direction of the force transmission web, the anchor pipe is partially sleeved outside the stiffening plate, and the stiffening plate is arranged on the upper side of the force transmission web and is of a cylindrical structure. The plate is connected with the base metal in a welding mode, for easy-to-weld materials such as carbon steel, low alloy steel and the like, double-side open-mouth welding is needed, for difficult-to-weld materials such as stainless steel and the like, double-side open-mouth welding is needed, when the thickness of the plate exceeds 26mm and belongs to an ultra-thick plate, if a process of welding a groove is arranged on one side of the plate, a metal filling area is too wide, and when welding rods are used for fusion filling, the welding rods are not easy to fully fuse and mix with the plate and the base metal, an unfused area is easy to form, the strength and compactness of a welded joint are affected, and the metal filling area is high in temperature, large in area and long in high-temperature duration time, so that the contacted base metal is subjected to tissue and performance change. It is therefore required to weld the plate material with double bevel. The dense structure is difficult to manufacture in steel structure, mainly because the spacing between adjacent plates to be welded on base metal is small and the heights of the plates are high, so that the welding view angles of the opposite sides of the adjacent plates are large, the melted alloy is not easy to fully fill in grooves in the opposite sides, the dense structure is difficult to realize welding and assembling of the grooves symmetrically arranged on both sides, a single-side groove form is often adopted, a steel gasket is needed, the welding amount is large, the welding material consumes much, the welding time is long, the angular deformation contracts to one side, the joint stress is overlarge, the whole deformation is also large, the fatigue performance of the welded joint is poor, and only a new joint form and a new construction method are adopted, so that the product manufacture can be carried out. Disclosure of Invention The invention provides an inverse conventional welding manufacturing method of a dense structure, and designs an inverse conventional penetration welding T-shaped joint form, which can realize double-sided welding, reduce welding quantity, welding material consumption and welding time, further reduce residual stress of a welded joint, furthest control corner deformation, avoid being applicable to a steel gasket and improve fatigue performance of the joint. Aiming at a steel anchor box in a steel structure bridge, the technical scheme of the invention is that the method is used for realizing the welding of a full penetration t-type butt weld of a dense plate and a metal mother plate, wherein the thickness of the dense plate is not less than 26mm, one side of the dense plate is provided with a barrier plate, the ratio of the height of the barrier plate to the distance from any point on the barrier plate to the dense plate is tan 52-tan 60 degrees, and the distance from any point on the barrier plate to the dense plate is not more than the distance for welding equipment or people to pass through; the anti-conventional assembly welding manufacturing method comprises the following steps of: (1) Cutting an inner groove on one side of the edge of the butt joint of the dense sheet and the metal motherboard facing the barrier sheet, cutting an outer groove on the other side of the edge, wherein the cutting angle of the inner groove is set to ensure that the tangent value of the cutting