WO2019041458A1

WO2019041458A1 - Intermittent fillet welding method

Info

Publication number: WO2019041458A1
Application number: PCT/CN2017/105974
Authority: WO
Inventors: 魏涛
Original assignee: 广船国际有限公司
Priority date: 2017-08-29
Filing date: 2017-10-13
Publication date: 2019-03-07
Also published as: CN107414331B; CN107414331A

Abstract

Provided is an intermittent fillet welding method. The method comprises: providing a first workpiece (1) and a second workpiece (2) to be fillet welded; machining and forming several grooves (3) at a welding end of the first workpiece along the lengthwise direction thereof at intervals, and thereby enabling the grooves to penetrate the first workpiece in the thickness direction of the first workpiece; and then all-round welding the welding end to the surface of the second workpiece so as to form several annular welding seams (4). According to the method, several grooves arranged at intervals are machined at the welding end of the first workpiece, and the welding end is then all-round welded at the surface of the second workpiece, and the formed welding seams extend from one side of the first workpiece to the other side of the first workpiece by passing through the grooves, forming an annular completely-surrounded structure, so that gaps between the welding seams and the two workpieces are completely sealed in the welding seams, thereby avoiding water accumulation at the gaps and corrosion and rust due to the influence of a humid environment; and grooves are formed at non-welded places, and paint may be completely sprayed for protection within the groove range, thereby avoiding the corrosion and rust at the grooves caused by accumulated water.

Description

Intermittent fillet welding method

Technical field

The invention relates to the technical field of structural welding, and in particular to a method of intermittent fillet welding.

Background technique

The materials used in the ship's hull structure are all steel. The assembly of these steel structures is welded by welding, and almost all joints need to be welded. In the upper living area of the hull structure, a large amount of steel with a thickness of 3 to 8 mm and a small amount of aluminum alloy and stainless steel are designed. At the same time, the load on the structure is not large. Considering the thin plate, the welding deformation is heavy, and the correction workload is large. Reducing the deformation while achieving the required joint strength, wherein the corner joint welds use a large number of intermittent welds instead of continuous welding to reduce the welding heat input to the quality requirements of the flatness of the hull structure products in the upper living area.

At present, all the shipbuilding products built by the company are only in the dry area. The aggregate is connected to the inner wall or the deck by the joint angle. As shown in Fig. 1 and Fig. 2, the first workpiece 1' intermittent fillet weld is The surface of the second workpiece 2'. There is an assembly gap where there is no welding between the first workpiece 1' and the second workpiece 2', and the area between the gaps cannot be spray-protected, and when there is rain in the outdoor manufacturing process, the gap between the two workpieces It is easy to seep and cause rust and corrosion; and when the ship is sailing in the sea, the indoor and outdoor temperature difference is large and the moisture produces condensed water. The water penetrates into the gap where the two workpieces are not welded, causing rust corrosion and affecting the use of steel. Life expectancy threatens the safety of the ship. At present, the conventional practice to solve this problem is to modify the intermittent welding to continuous welding. The design is continuous welding, which can effectively prevent moisture from penetrating into the unwelded part and cause rust corrosion, but it will cause welding workload and cost increase, as well as welding deformation plus The large and corrective deformation workload is increased, which affects the ship's production efficiency and cost control.

Summary of the invention

It is an object of the present invention to provide a discontinuous fillet welding method which prevents rust and workpiece deformation between two workpieces after welding.

To this end, the present invention employs the following technical solutions:

Providing a discontinuous fillet welding method, providing a first workpiece and a second workpiece to be fillet welded, and forming a plurality of grooves along the length direction of the welded end of the first workpiece, so that the groove is along the The thickness direction of the first workpiece extends through the first workpiece, and then the weld end is wrap angled to the surface of the second workpiece to form a plurality of annular weld beads.

As a preferred embodiment of the intermittent fillet welding method, the length of the groove extends along the length of the welded end, and the distance between adjacent two of the grooves is equal.

As a preferred embodiment of the intermittent fillet welding method, the groove has a length L and the length L = 75 mm to 150 mm.

As a preferred embodiment of the intermittent fillet welding method, the height of the first workpiece is H, the groove depth of the groove is h, wherein the groove depth h ≤ 0.25H, and the groove depth h ≤ 75mm.

As a preferred embodiment of the intermittent fillet welding method, the ratio L/h ≤ 2 of the length L of the groove to the groove depth h of the groove.

As a preferred solution of the intermittent fillet welding method, a first circular arc transition is adopted between the groove bottom of the groove and the groove wall.

As a preferred embodiment of the intermittent fillet welding method, the radius of the first circular arc is R1, and the radius R1 ≥ 25 mm.

As a preferred solution of the intermittent fillet welding method, an inverse S-shaped circular arc transition is adopted between the groove bottom of the groove and the groove wall, and the reverse S-shaped circular arc includes a second circular arc and a third circular arc. The radius R2 of the second arc is greater than the radius R3 of the third arc, and one end of the second arc is connected to the bottom of the groove, and the other end Connected to one end of the third circular arc, and one end of the third circular arc away from the second circular arc is connected to the groove wall.

As a preferred embodiment of the intermittent fillet welding method, the groove wall has a height of 10 to 25 mm.

As a preferred solution of the intermittent fillet welding method, the following steps are included:

S10. Design a structure and a size of the groove according to the strength and fatigue requirements of the workpiece, and draw a pattern of the groove. A circular arc transition is adopted between the groove wall and the groove bottom of the groove, and the length of the groove is a ratio L of the groove depth h of the groove L/h ≤ 2, and the length L = 75 mm to 150 mm; the groove depth h ≤ 0.25H, and the groove depth h ≤ 75 mm; The ratio of the length L to the groove depth h of the groove L / h ≤ 2; the arc radius R ≥ 25mm, the height of the groove wall is 10 ~ 25mm;

S20. Analyze the shear bending strength and the stress concentration value of the groove structure by using finite element modeling, and adjust the shape and size of the groove until the shearing and shearing strength and stress concentration of the groove structure The value meets the strength requirements of the workpiece;

S30, performing structural modeling according to the shape and size of the groove to obtain a structure of the groove;

S40, cutting and forming the groove at the welding end of the workpiece according to the structure of the groove;

S50. Weld the welding end of the workpiece to the surface of another unslotted workpiece, and after sanding and painting, complete the welding.

The invention has the beneficial effects that the present invention processes a plurality of spaced grooves at the welding end of the first workpiece, and then welds the welded end wrap to the surface of the second workpiece, and the formed weld is formed by the first workpiece. The groove is wound around the other side of the first workpiece to form an annular all-inclusive structure, so that the gap between the weld bead and the two workpieces can be completely sealed in the weld seam, thereby avoiding the formation of water in the gap. It is rusted and corroded by the influence of humid environment; at the same time, there is a groove in the unwelded place, and the paint protection can be completely sprayed in the groove range to prevent the water from staying in the groove and rust and corrosion.

DRAWINGS

Figure 1 is a schematic view of the intermittent fillet welding of two existing workpieces.

Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1;

3 is a schematic view showing the intermittent fillet welding of the first workpiece and the second workpiece according to an embodiment of the present invention.

Figure 4 is an enlarged view of a portion I (not welded) of Figure 3.

FIG. 5 is a schematic view showing the intermittent fillet welding of the first workpiece and the second workpiece according to another embodiment of the present invention.

Figure 6 is a cross-sectional view taken along line B-B of Figure 5;

Figure 7 is an enlarged view of a portion II (not welded) of Figure 5.

In Figure 1:

1', first workpiece; 2', second workpiece; 3', weld seam.

In Figures 2 to 7:

1, the first workpiece; 2, the second workpiece; 3, the groove; 31, the groove bottom; 32, the groove wall; 33, the first arc; 34, the second arc; 35, the third arc; Weld seam.

Detailed ways

The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the orientation or positional relationship of the terms "inside", "outside" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description. Instead of indicating or implying that the device or component referred to must have a particular orientation, constructed and operated in a particular orientation, it is not to be construed as limiting the invention.

Moreover, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first", "second", and "third" may include one or more of the features, either explicitly or implicitly.

In the description of the present invention, the term "fixed" is to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or a mechanical connection, unless otherwise explicitly defined and defined. It is an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, which can be the internal connection of two components or the interaction of two components. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

In the present invention, the first feature "on" or "under" the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. It is not in direct contact but through additional features between them. Moreover, the first feature "on" the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature "under" the second feature includes the first feature directly below and below the second feature, or merely indicating that the first feature level is less than the second feature.

As shown in Figures 3 to 7, an embodiment of the present invention provides a discontinuous fillet welding method, which provides a first workpiece 1 and a second workpiece 2 to be fillet welded, spaced along the length of the welded end of the first workpiece 1. Forming a plurality of grooves 3 such that the groove 3 penetrates the first workpiece 1 in the thickness direction of the first workpiece 1, and then welds the welded end to the surface of the second workpiece 2 to form a plurality of annular welds 4, along the welding In the longitudinal direction of the end, the two ends of the weld bead 4 are respectively located in the two grooves 3 adjacent thereto. The present invention processes a plurality of spaced grooves 3 at the welding end of the first workpiece 1, and then welds the welded end wrap to the surface of the second workpiece 2, forming a weld 4 from the side of the first workpiece 1. The groove 3 is wound around the other side of the first workpiece 1 to form an annular all-inclusive structure, so that the gap between the weld bead 4 and the two workpieces can be completely sealed in the weld bead 4, avoiding the gap It forms stagnant water and is rusted and corroded by the influence of humid environment; at the same time, it avoids water stagnation and corrosion at the groove 3.

In this embodiment, after the groove is grooved, the corner welding is performed, and the welding heating does not damage the primer applied when the groove 3 is at the workshop; the intermittent angle fillet welding method of the embodiment is applied to the ship segmentation. Slotting It will reduce the weight of the empty ship of the hull structure, thereby increasing the cargo load; and reducing the welding length, saving the welding time and welding materials, reducing the welding cost and the amount of fire correction work, and shortening the construction period of the segment.

In the present embodiment, the first workpiece 1 and the second workpiece 2 are vertically welded. In other embodiments, the intermittent fillet welding method of the present invention is suitable for angular welding at any angle.

In this embodiment, the length of the groove 3 extends along the length direction of the welded end, and the distance between the adjacent two grooves 3 is equal, so that the joint strength between the welded end between the first workpiece 1 and the second workpiece 3 is more It is uniform, thereby improving the fatigue strength of the workpiece after welding.

Specifically, the length of the groove 3 is L, and the length L is 75 mm to 150 mm, and the specific length value depends on the size of the workpiece.

The height of the first workpiece 1 is H, the groove depth of the groove 3 is h, wherein the groove depth h ≤ 0.25H, and the groove depth h ≤ 75 mm, when the first workpiece 1 is welded to the surface of the second workpiece 2, On the basis of ensuring the joint strength of the two workpieces, smooth bevel welding can be achieved, and the fatigue strength of the workpiece after welding can be improved.

Preferably, the ratio L/h ≤ 2 of the length L of the groove 3 to the groove depth h of the groove 3 is to further improve the fatigue strength of the workpiece after welding.

In an embodiment of the present invention, as shown in FIGS. 3 and 4, a first arc 33 is transitioned between the groove bottom 31 of the groove 3 and the groove wall 32 to reduce the stress concentration of the welded ends of the two workpieces.

The radius of the first arc 33 is R1, the radius R1 ≥ 25 mm, and the central angle of the first arc 33 is less than or equal to 90°.

In another embodiment of the present invention, as shown in FIG. 5 to FIG. 7 , an inverse S-shaped arc transition is sequentially adopted between the groove bottom 31 of the groove 3 and the groove wall 32, and the inverted S-shaped arc includes the first The second arc 34 and the third arc 35, the radius R2 of the second arc 34 is greater than the radius R3 of the third arc 35, and one end of the second arc 34 is connected to the groove bottom 31, and the other end and the third arc 35 One end is connected, and the third arc 35 is away from the second arc 34 The end is connected to the groove wall 32. Two arc transitions between the groove bottom 31 and the groove wall 32 can further reduce the stress concentration at the welded end.

Specifically, the radius R2 of the second circular arc 34 is 25 mm, the central angle is 180°, the radius R3 of the third circular arc 35 is 8 mm, and the central angle is less than or equal to 90°.

The height of the groove wall 32 is 10 to 25 mm, preferably 15 mm.

In this embodiment, by optimizing the structure and size of the groove 3, the stress concentration of the welded end is optimized on the basis of ensuring sufficient fatigue resistance of the workpiece.

In a specific embodiment of the invention, the intermittent fillet welding method specifically comprises the following steps:

S10, designing the structure and size of the groove 3 according to the strength and fatigue requirements of the workpiece and drawing the pattern of the groove 3. The groove 33 of the groove 3 and the groove bottom 31 are transitioned by an arc 33, and the length L of the groove 3 The ratio L/h ≤ 2 to the groove depth h of the groove 3, and the length L = 75 mm to 150 mm; the groove depth h ≤ 0.25H, and the groove depth h ≤ 75 mm; the length L of the groove 3 and the groove of the groove 3. The ratio of the depth h is L/h ≤ 2; the radius of the arc is R ≥ 25 mm, and the height of the groove wall 32 is 10 to 25 mm;

S20, using finite element modeling to analyze the structural shear and bending strength and stress concentration value of the groove 3, and adjusting the shape and size of the groove 3 until the structural shear and bending strength of the groove 3 and the stress concentration value conform to the workpiece Strength and fatigue resistance requirements;

S30, performing structural modeling according to the shape and size of the groove 3, and obtaining the structure of the groove 3;

S40, according to the structure of the groove 3 at the welding end of the workpiece to cut the groove 3;

In this embodiment, a plurality of grooves 3 are formed in the welded end of one of the workpieces, and then the two workpieces are angularly welded by a discontinuous wrap welding method, and the welded joint forms a closed annular space to prevent moisture from entering and rusting and corroding.

The discontinuous wrap welding method of the present invention can be applied to the entire construction area of the ship, which can save welding materials and labor costs, shorten production time, and is expected to save more than 50,000 costs for the construction of each ship.

It is to be understood that the above-described embodiments are merely preferred embodiments of the invention and the technical principles of the invention, and any changes or substitutions that are readily apparent to those skilled in the art are within the scope of the presently disclosed technology. All should be covered by the scope of the present invention.

The present invention has been described above by way of specific embodiments, but the invention is not limited to the specific embodiments. It will be apparent to those skilled in the art that various modifications, equivalents, changes, and the like can be made in the present invention. However, these modifications are intended to be included within the scope of the present invention as long as they do not depart from the spirit of the invention. In addition, some terms used in the specification and claims of the present application are not limiting, but are merely for convenience of description.

Claims

An intermittent fillet welding method, characterized in that a first workpiece and a second workpiece to be fillet welded are provided, and a plurality of grooves are formed at intervals along a longitudinal direction of the welded end of the first workpiece, so that the groove The first workpiece is penetrated in a thickness direction of the first workpiece, and then the welded end is angularly welded to a surface of the second workpiece to form a plurality of annular weld beads.
The intermittent fillet welding method according to claim 1, wherein a length of the groove extends along a length direction of the welded end, and a distance between adjacent two of the grooves is equal.
The intermittent fillet welding method according to claim 1, wherein the groove has a length L and the length L = 75 mm to 150 mm.
The intermittent fillet welding method according to claim 3, wherein the height of the first workpiece is H, the groove depth of the groove is h, wherein the groove depth h ≤ 0.25H, and The groove depth h ≤ 75 mm.
The intermittent fillet welding method according to claim 4, wherein a ratio L/h ≤ 2 of a length L of the groove to a groove depth h of the groove.
The intermittent fillet welding method according to claim 1, wherein a first circular arc transition is adopted between the groove bottom of the groove and the groove wall.
The intermittent fillet welding method according to claim 6, wherein the radius of the first circular arc is R1, and the radius R1 ≥ 25 mm.
The intermittent fillet welding method according to claim 1, wherein an inverse S-shaped circular arc transition is adopted between the groove bottom of the groove and the groove wall, and the reverse S-shaped circular arc includes a second circular arc and a third arc, a radius R2 of the second arc is greater than a radius R3 of the third arc, and one end of the second arc is connected to the bottom of the groove, and the other end is opposite to the third arc One end is connected, and one end of the third arc away from the second arc is connected to the groove wall.
The intermittent fillet welding method according to any one of claims 6 to 8, characterized in that the height of the groove wall is 10 to 25 mm.
The intermittent fillet welding method according to any one of claims 1 to 8, comprising the steps of:

S10. Design a structure and a size of the groove according to the strength and fatigue requirements of the workpiece, and draw a pattern of the groove. A circular arc transition is adopted between the groove wall and the groove bottom of the groove, and the length of the groove is a ratio L of the groove depth h of the groove L/h ≤ 2, and the length L = 75 mm to 150 mm; the groove depth h ≤ 0.25H, and the groove depth h ≤ 75 mm; The ratio of the length L to the groove depth h of the groove L / h ≤ 2; the arc radius R ≥ 25mm, the height of the groove wall is 10 ~ 25mm;

S20. Analyze the shear and bending strength and the stress concentration value of the groove structure by using finite element modeling, and adjust the shape and size of the groove until the shearing and bending strength and stress concentration of the groove structure The value meets the strength requirements of the workpiece;

S30, performing structural modeling according to the shape and size of the groove to obtain a structure of the groove;

S40, cutting and forming the groove at the welding end of the workpiece according to the structure of the groove;

S50. Weld the welding end of the workpiece to the surface of another unslotted workpiece, and after sanding and painting, complete the welding.