Ultra-high-strength steel and high-strength steel welding structure and welding process

Abstract

The present application relates to the technical field of ultra-high-strength steel welding, and in particular to an ultra-high-strength steel and high-strength steel welding structure and welding process; the ultra-high-strength steel and high-strength steel welding structure of the present application includes an ultra-high-strength steel workpiece, a high-strength steel workpiece and a transition high-strength steel workpiece; the transition high-strength steel workpiece is arranged between the ultra-high-strength workpiece and the high-strength steel workpiece, and the ultra-high-strength steel workpiece and the high-strength steel workpiece are connected by welding the transition high-strength steel workpiece; the welding connection performance of the transition high-strength steel workpiece and the ultra-high-strength steel workpiece is higher than the welding connection performance between the high-strength steel workpiece and the ultra-high-strength steel workpiece. The present application introduces a transition high-strength steel workpiece with relatively good welding performance into the ultra-high-strength steel workpiece and the high-strength steel workpiece, reduces the large difference in metallographic structure and metal physical properties between ultra-high-strength steel and high-strength steel, and the poor compatibility, and the risk of hardened structure and welding cracks in welding, and solves the problem of cracking of the welding seam of the ultra-high-strength steel and high-strength steel welding structure.

Description

Technical Field

[0001] The present application relates to the technical field of ultra-high-strength steel welding, and in particular to an ultra-high-strength steel and high-strength steel welding structure and welding process. Background Art

[0002] Ultra-high-strength steel and high-strength steel are metal armor materials with ultra-high strength, and their strength is usually more than 1700MPa, and they are mostly used as armor. The strength of ultra-high-strength steel currently used in the market is usually 1200-1500MPa. The welding technology of ultra-high-strength steel and high-strength steel is a key factor affecting the application of ultra-high-strength steel. The higher the strength of ultra-high-strength steel, the more difficult it is to weld. During the welding process of ultra-high-strength steel, strong welding restraint will be generated, which is easy to cause welding cracking and deformation problems, and the quality of the weld is difficult to control. How to achieve high-quality welding of 1700MPa ultra-high-strength steel has become the focus of research for technicians in this field. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an ultra-high strength steel and high-strength steel welding structure and welding process to achieve high-quality welding of ultra-high strength steel and high-strength steel.

[0004] The technical solution provided by the present invention is as follows:

[0005] An ultra-high-strength steel and high-strength steel welding structure, comprising: an ultra-high-strength steel workpiece, a high-strength steel workpiece and a transitional high-strength steel workpiece;

[0006] The transition high-strength steel workpiece is arranged between the ultra-high-strength workpiece and the high-strength steel workpiece, and the ultra-high-strength steel workpiece and the high-strength steel workpiece are connected by welding the transition high-strength steel workpiece;

[0007] The welding connection performance between the transition high-strength steel workpiece and the ultra-high-strength steel workpiece is higher than the welding connection performance between the high-strength steel workpiece and the ultra-high-strength steel workpiece.

[0008] Furthermore, the steel plates of the ultra-high-strength steel workpiece and the high-strength steel workpiece have the same thickness.

[0009] Furthermore, the gap between the ultra-high-strength steel workpiece and the high-strength steel workpiece is 2-3 times the thickness of the ultra-high-strength steel workpiece.

[0010] Furthermore, the ultra-high-strength steel workpiece is a flat plate structure, the transitional high-strength steel workpiece is a flat plate structure, and the high-strength steel workpiece is a tubular structure.

[0011] The present application also provides a welding process for ultra-high-strength bulletproof steel and high-strength steel, including the above-mentioned welding structure, comprising the following steps:

[0012] Pre-treat the area to be welded of the welding workpiece;

[0013] Positioning and overlapping the welding workpieces to form a large gap structure between the high-strength steel workpiece and the ultra-high-strength steel workpiece, wherein the large gap is 2-3 times the thickness of the high-strength steel workpiece or the ultra-high-strength steel workpiece;

[0014] Use 70-80 kg welding wire to weld high-strength steel workpieces, transitional high-strength steel workpieces and ultra-high-strength steel workpieces. During the welding process, control the interlayer temperature and wind speed in the welding area.

[0015] Furthermore, the pretreatment of the area to be welded of the welding workpiece specifically includes: preheating the area to be welded of the welding workpiece, removing moisture, rust and oil stains on the area to be welded, and grinding and repairing pores and cracks of the weld.

[0016] Furthermore, during the welding process of the high-strength steel workpiece, the transitional high-strength steel workpiece and the ultra-high-strength steel workpiece, the first fillet weld formed by the high-strength steel workpiece and the transitional high-strength steel workpiece is welded first; secondly, the second fillet weld formed by the ultra-high-strength workpiece and the transitional high-strength steel workpiece is welded; then, the base weld between the first fillet weld and the second fillet weld on the transitional high-strength steel workpiece is welded, and the base weld is used to connect the first fillet weld and the second fillet weld; finally, the cover weld between the first fillet weld and the second fillet weld is welded.

[0017] Furthermore, the interlayer temperature is between 100 and 200 degrees, and the wind speed in the welding area is less than 1 m / s.

[0018] Furthermore, the method also includes post-weld insulation and weld inspection steps, and performs one or more non-destructive testing of MT, PT and RT on the weld after welding.

[0019] Furthermore, before the weld inspection step, the step also includes a slow cooling treatment of the welded workpiece to extend the cooling time of the welded workpiece.

[0020] Beneficial effects:

[0021] Compared with the prior art, the ultra-high-strength steel and high-strength steel welding structure of the present application introduces a transitional high-strength steel workpiece with relatively good welding performance between the ultra-high-strength steel workpiece and the high-strength steel workpiece, reduces the large difference in metallographic structure and metal physical properties between ultra-high-strength steel and high-strength steel and the poor compatibility, and reduces the risk of hardened structure and welding cracks in welding, thereby solving the problem of cracking in the welding seam of the ultra-high-strength steel and high-strength steel welding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic structural diagram of a welding structure of ultra-high-strength steel and high-strength steel according to the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the butt joint structure of the fillet weld of medium-high-strength steel and transitional high-strength steel;

[0025] Figure 3 It is a schematic diagram of the flat butt joint structure of high-strength steel and transition high-strength steel;

[0026] Figure 4 for Figure 3 Schematic diagram of the flat butt weld structure of medium-high-strength steel and transitional high-strength steel;

[0027] Figure 5 This is a flow chart of a welding process of ultra-high strength steel and high strength steel according to the present invention;

[0028] Figure numerals: 1. ultra-high strength steel, 2. transitional high strength steel, 3. high strength steel, d. large gap, 4. first fillet weld, 5. second fillet weld, 6. base weld, 7. cover weld. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0033] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0034] like Figure 1 As shown, an embodiment of the present invention provides an ultra-high-strength steel and high-strength steel welding structure, comprising: an ultra-high-strength steel workpiece 1, a high-strength steel workpiece 3 and a transition high-strength steel workpiece 2; the transition high-strength steel workpiece is arranged between the ultra-high-strength workpiece and the high-strength steel workpiece, and the ultra-high-strength steel workpiece and the high-strength steel workpiece are welded and connected through the transition high-strength steel workpiece; the welding connection performance of the transition high-strength steel workpiece and the ultra-high-strength steel workpiece is higher than the welding connection performance between the high-strength steel workpiece and the ultra-high-strength steel workpiece.

[0035] The ultra-high-strength steel and high-strength steel welding structure of the present application introduces a transitional high-strength steel workpiece with relatively good welding performance between the ultra-high-strength steel workpiece and the high-strength steel workpiece, reduces the risk of hardened structure and welding cracks due to the large difference in metallographic structure and metal physical properties and poor compatibility between ultra-high-strength steel and high-strength steel, and solves the problem of cracking in the welding seam of the ultra-high-strength steel and high-strength steel welding structure.

[0036] As a preferred embodiment, Figure 1 to Figure 2 As shown, the ultra-high-strength steel workpiece of the present application is a flat plate structure, which is an ultra-high-strength steel plate; the transitional high-strength steel workpiece is a flat plate structure, which is a transitional high-strength steel plate, and the high-strength steel workpiece is a tubular structure, which is a high-strength steel pipe.

[0037] The steel plate thickness of the ultra-high-strength steel workpiece, the transitional high-strength steel workpiece and the high-strength steel workpiece is the same. Preferably, the thickness of the ultra-high-strength steel workpiece, the high-strength steel workpiece and the transitional high-strength steel workpiece are all 3-5mm. The gap between the ultra-high-strength steel workpiece and the high-strength steel workpiece is 2-3 times the thickness of the ultra-high-strength steel workpiece. In the present application, the preferred gap is 8-12mm. The large gap structure of 8-12mm effectively ensures that the fillet welds of the ultra-high-strength steel workpiece and the transitional high-strength steel workpiece are independent of the fillet welds of the high-strength steel workpiece and the transitional high-strength steel workpiece.

[0038] See also Figure 5 The present application also provides a welding process for ultra-high-strength bulletproof steel and high-strength steel, including the above-mentioned welding structure, comprising the following steps:

[0039] Pre-treat the area to be welded of the welding workpiece;

[0040] Position the overlap welding workpieces to form a large gap structure between the high-strength steel workpiece and the ultra-high-strength steel workpiece, wherein the large gap is 2-3 times the thickness of the high-strength steel workpiece or the ultra-high-strength steel workpiece; the 2-3 times large gap d ensures that the first fillet weld formed by welding the high-strength steel workpiece and the transitional high-strength steel workpiece and the second fillet weld formed by the ultra-high-strength steel workpiece and the transitional high-strength steel workpiece are independent of each other, thereby ensuring that the welding quality of each fillet weld is not easily affected.

[0041] Use 70-80 kg welding wire to weld high-strength steel workpieces, transitional high-strength steel workpieces and ultra-high-strength steel workpieces, and control the interlayer temperature and wind speed in the welding area during the welding process. The interlayer temperature is 100-200 degrees, and the wind speed in the welding area is less than 1m / s. Welding within this limited range of wind speed and interlayer temperature is conducive to improving the welding quality of the weld.

[0042] Preferably, the pretreatment of the area to be welded of the welding workpiece specifically includes: preheating the area to be welded of the welding workpiece, removing moisture, rust and oil stains on the area to be welded, and grinding and repairing pores and cracks of the weld.

[0043] During the welding process of the high-strength steel workpiece, the transitional high-strength steel workpiece and the ultra-high-strength steel workpiece, the first fillet weld 4 formed by the high-strength steel workpiece and the transitional high-strength steel workpiece is welded first; secondly, the second fillet weld 5 formed by the ultra-high-strength workpiece and the transitional high-strength steel workpiece is welded; then, the base weld 6 between the first fillet weld and the second fillet weld on the transitional high-strength steel workpiece is welded, and the base weld is used to connect the first fillet weld and the second fillet weld; finally, the cover weld 7 between the first fillet weld and the second fillet weld is welded.

[0044] Figure 1 and Figure 2 The fillet weld structure of the welded structure in this application; Figure 3 and Figure 4This is the flat butt weld structure of the welding structure of this application. For both the fillet weld structure and the flat butt weld structure, the first fillet weld formed by the high-strength steel pipe and the transition high-strength steel plate is welded first, and then the second fillet weld formed by the ultra-high-strength steel plate and the transition high-strength steel plate is welded, and then the third base weld formed by the first fillet weld and the second fillet weld on the transition high-strength steel plate is welded, and finally the fourth cover weld is welded. In the above welding method, the first fillet weld, the second fillet weld, the third base weld and the fourth cover weld are welded in sequence, which can effectively ensure that the weld foot of each weld is small and the heat input is small. At the same time, for welding joints with large constraints, the shrinkage stress can be reduced to prevent cracks from occurring. In addition, the transitional high-strength steel plate workpieces, ultra-high-strength steel workpieces and high-strength steel workpieces introduced in the welding structure have good welding performance with the transitional high-strength steel plate workpieces, which effectively solves the welding cracks and welding problems of hardened structure in the heat-affected zone caused by defects such as large differences in the metallographic structure, metal physical properties and poor compatibility of the original ultra-high-strength steel and high-strength steel.

[0045] It should be noted that during the welding process of high-strength steel workpieces, transitional high-strength steel workpieces and ultra-high-strength steel workpieces, the temperature can be monitored and measured by an infrared thermometer. When the welding environment temperature is lower than 5 degrees Celsius, the welding workpiece is preheated to the required interlayer temperature range for welding; the preheating methods include but are not limited to flame heating, power frequency induction heating, infrared heating, electric furnace, microwave oven heating, etc. When the temperature of the base material position of the welding weld is 20% higher than the interlayer temperature, it is necessary to cool to the required interlayer temperature before welding. In addition, in order to ensure slow cooling after welding, ceramic fiber insulation blankets and other related products can also be used for post-weld insulation of the welded workpiece.

[0046] As a preferred embodiment, it also includes a weld inspection step, and performs one or more non-destructive testing of MT, PT and RT on the welded weld. Before the weld inspection step, it also includes a slow cooling treatment of the welded workpiece after welding, using a ceramic fiber blanket to wrap the welded workpiece, or placing the welded workpiece in an insulated box for airtight cooling to delay the cooling rate of the welded workpiece. Through the actual welding verification of the welding steps of the welding process of this application, the MT or PT inspection of the welds of the ultra-high strength steel and high-strength steel structure after welding has no cracks and weld pores, and the RT inspection reaches level one, meeting the welding requirements of ultra-high strength steel and high-strength steel.

[0047] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A welding process for ultra-high strength steel and high strength steel, It is characterized in that The invention relates to a welding structure of ultra-high-strength steel and high-strength steel, wherein the ultra-high-strength steel and high-strength steel are metal armor materials with ultra-high strength; the welding structure comprises: an ultra-high-strength steel workpiece, a high-strength steel workpiece and a transition high-strength steel workpiece; the transition high-strength steel workpiece is arranged between the ultra-high-strength workpiece and the high-strength steel workpiece, and the ultra-high-strength steel workpiece and the high-strength steel workpiece are welded and connected through the transition high-strength steel workpiece; the welding connection performance of the transition high-strength steel workpiece and the ultra-high-strength steel workpiece is higher than the welding connection performance between the high-strength steel workpiece and the ultra-high-strength steel workpiece; the ultra-high-strength steel workpiece is a flat plate structure, the transition high-strength steel workpiece is a flat plate structure, and the high-strength steel workpiece is a tubular structure; the gap between the ultra-high-strength steel workpiece and the high-strength steel workpiece is 2-3 times the thickness of the ultra-high-strength steel workpiece; the invention comprises the following steps: Pre-treat the area to be welded of the welding workpiece; Position the overlap welding workpieces to form a large gap structure between high-strength steel workpieces and ultra-high-strength steel workpieces. The thickness of ultra-high-strength steel workpieces, high-strength steel workpieces and transitional high-strength steel workpieces are all 3-5mm; the range value of the large gap structure is 8-12mm; Use 70-80 kg welding wire to weld high-strength steel workpieces, transitional high-strength steel workpieces and ultra-high-strength steel workpieces, and control the interlayer temperature range and wind speed in the welding area; During the welding process of high-strength steel workpieces, transitional high-strength steel workpieces and ultra-high-strength steel workpieces, the first fillet weld formed by the high-strength steel workpiece and the transitional high-strength steel workpiece is welded first; secondly, the second fillet weld formed by the ultra-high-strength workpiece and the transitional high-strength steel workpiece is welded; then, the base weld between the first fillet weld and the second fillet weld on the transitional high-strength steel workpiece is welded, and the base weld is used to connect the first fillet weld and the second fillet weld; finally, the cover weld between the first fillet weld and the second fillet weld is welded.

2. The ultra-high strength steel and high strength steel welding process according to claim 1, It is characterized in that The pretreatment of the area to be welded of the welding workpiece specifically includes: preheating the area to be welded of the welding workpiece, removing moisture, rust and oil stains on the area to be welded, and grinding and repairing pores and cracks of the weld.

3. The ultra-high strength steel and high strength steel welding process according to claim 2, It is characterized in that The interlayer temperature range is 100-200 degrees, and the wind speed in the welding area is less than 1m / s.

4. The ultra-high strength steel and high strength steel welding process according to claim 3, It is characterized in that The method also includes a weld inspection step, in which one or more nondestructive testing of MT, PT and RT is performed on the welded weld.

5. The ultra-high strength steel and high strength steel welding process according to claim 4, It is characterized in that The weld detection step also includes a slow cooling treatment of the welded workpiece after welding.

Images