CN118527772A - A welding method for stainless steel composite plate - Google Patents

Abstract

A welding method of a stainless steel composite board relates to the field of welding. The welding method of the stainless steel composite plate is that the Q345qE and S32168 stainless steel composite plate are provided with V-shaped grooves to carry out base layer welding, transition layer welding and stainless steel layer welding; G49A4UC1S6 welding wire and CO ₂ gas shielded welding are used for welding a base layer, the welding current is 170-190A, the voltage is 24-28V, and the gas flow is 16-18L/min; TS309L-FC11 stainless steel welding wire and argon arc welding for welding a transition layer, wherein the welding current is 100-120A, the voltage is 14-18V, and the gas flow is 12-14L/min; TS347L-FC11 stainless steel welding wire and argon arc welding for welding a stainless steel layer, wherein the welding current is 110-130A, the voltage is 16-20V, and the gas flow is 12-14L/min. The welding method of the stainless steel composite plate can be used for welding the bridge stainless steel composite plate with good mechanical property and excellent welding quality.

Description

A welding method for stainless steel composite plate

Technical Field

The present application relates to the field of welding, and in particular to a welding method for a stainless steel composite plate.

Background Art

At present, stainless steel bridge steel composite plates have been widely used in bridge engineering projects. At present, 316L stainless steel and bridge steel are often used in the welding of bridge stainless steel composite plates, and gas shielded welding is used for welding. However, the bridge stainless steel composite plates obtained by this welding method are prone to cracks, which in turn affects the quality of the joints.

Summary of the invention

The purpose of the present application is to provide a welding method for stainless steel composite plates, by which Q345qE and S32168 stainless steel composite plates are welded to obtain stainless steel composite plates with good mechanical properties and excellent welding quality, thereby meeting the welding requirements of stainless steel composite plates for bridges.

This application is implemented as follows:

The present application provides a welding method for a stainless steel composite plate, comprising the following steps:

Butt Q345qE and S32168 stainless steel composite plates together and process V-shaped grooves;

The base layer welding, transition layer welding and stainless steel layer welding are carried out from bottom to top in sequence to obtain a stainless steel composite plate; when welding the base layer, G49A4UC1S6 welding wire and _CO2 gas shielded welding are used, the welding current is 170-190A, the voltage is 24-28V, and the gas flow rate is 16-18L/min; when welding the transition layer, TS309L-FC11 stainless steel welding wire and argon arc welding are used, the welding current is 100-120A, the voltage is 14-18V, and the gas flow rate is 12-14L/min; when welding the stainless steel layer, TS347L-FC11 stainless steel welding wire and argon arc welding are used, the welding current is 110-130A, the voltage is 16-20V, and the gas flow rate is 12-14L/min.

In some optional implementation schemes, Q345qE and S32168 stainless steel composite plates are flatly butted for assembly positioning and then V-shaped grooves are processed, with an assembly accuracy gap of 0 to 1 mm and a misalignment of less than 1 mm.

In some optional implementation schemes, the dry extension length of the welding wire during base layer welding is 12 to 18 mm.

In some optional implementation schemes, the dry extension length of the welding wire during transition layer welding is 8 to 10 mm.

In some optional implementation schemes, the dry extension length of the welding wire during welding of the stainless steel layer is 8 to 10 mm.

In some optional embodiments, the weld bead does not touch or melt the inner wall of the stainless steel layer during base welding, and the root or surface of the base welding weld bead is 1 to 2 mm away from the stainless steel layer.

In some optional embodiments, when the transition layer is welded, the thickness of the transition layer is made to be above 2 mm.

In some optional embodiments, when the stainless steel layer is welded, the excess height of the butt weld is less than 1.5 mm.

In some optional implementation schemes, before welding the base layer, transition layer and stainless steel layer from bottom to top, when the ambient temperature is below 5°C or the thickness of the stainless steel composite plate is ≥30mm, both sides of the weld of the stainless steel composite plate before welding are preheated to 60-120°C.

The beneficial effects of the present application are as follows: the welding method of the stainless steel composite plate provided in the present application comprises the following steps: horizontally butting the Q345qE and S32168 stainless steel composite plates and processing a V-shaped groove; performing base layer welding, transition layer welding and stainless steel layer welding in sequence from bottom to top to obtain a stainless steel composite plate; when welding the base layer, G49A4UC1S6 welding wire and _CO2 gas shielded welding are used, with a welding current of 170 to 190A, a voltage of 24 to 28V, and a gas flow rate of 16 to 18L/min; when welding the transition layer, TS309L-FC11 stainless steel welding wire and argon arc welding are used, with a welding current of 100 to 120A, a voltage of 14 to 18V, and a gas flow rate of 12 to 14L/min; when welding the stainless steel layer, TS347L-FC11 stainless steel welding wire and argon arc welding are used, with a welding current of 110 to 130A, a voltage of 16 to 20V, and a gas flow rate of 12 to 14L/min. The welding method of the stainless steel composite plate provided in the present application welds Q345qE and S32168 stainless steel composite plates so that the joints and weld areas have good mechanical properties and excellent welding quality, meeting the welding requirements of the stainless steel composite plates for bridges.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a stainless steel composite plate welding method provided in an embodiment of the present application in which Q345qE and S32168 stainless steel composite plates are flatly butted and a V-shaped groove is processed;

FIG2 is a schematic structural diagram of the flat butt welding of Q345qE and S32168 stainless steel composite plates in the welding method of stainless steel composite plates provided in an embodiment of the present application.

In the figure: 110, Q345qE and S32168 stainless steel composite plate; 120, ceramic liner; 130, base layer; 140, stainless steel layer.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in the subsequent drawings.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They 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 position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

The characteristics and performance of the welding method of the stainless steel composite plate of the present application are further described in detail below in conjunction with the embodiments.

As shown in FIG. 1 and FIG. 2 , the embodiment of the present application provides a welding method for a stainless steel composite plate, comprising the following steps:

Step 1: Select Q345qE and S32168 stainless steel composite plate 110 and select welding materials. The Q345qE and S32168 stainless steel composite plate 110 is composed of S32168 stainless steel plates and Q345qE steel plates that are sequentially arranged and connected from top to bottom.

Chemical composition of Q345qE steel plate: C≤0.14, Si≤0.55, Mn: 0.90～1.60, P≤0.020, S≤0.010, Cr≤0.30, V: 0.01～0.08, Nb: 0.01～0.09, Ti: 0.006～0.03, Ni≤0.30, Cu≤0.30, N≤0.008, Als: 0.01～0.045, CEV≤0.38. Mechanical properties of Q345qE steel plate: yield strength Rel≥345MPa, tensile strength Rm≥490MPa, elongation A≥20%, -40℃ impact energy KV2≥120J;

Chemical composition of S32168 stainless steel plate: C≤0.08, Si≤0.75, Mn≤2.0, P≤0.045, S≤0.030, Cr: 17.0～19.0, Ni: 9.0～12.0, N≤0.10. Mechanical properties of S32168 stainless steel: plastic extension strength RP0.2≥205MPa, tensile strength Rm≥515MPa, elongation A≥40%, hardness HV≤220J.

Use G49A4UC1S6 welding wire for base layer welding, TS309L-FC11 stainless steel welding wire for transition layer welding, and TS347L-FC11 stainless steel welding wire for stainless steel layer welding;

Chemical composition of G49A4UC1S6 welding wire: C: 0.06-0.14, Si: 0.80-1.00, Mn: 1.40-1.60, P≦0.025, S≦0.025, Ni≦0.15, Cr≦0.15, Cu≦0.35, MM≦0.15, V≦0.03; The performance of G49A4UC1S6 (Φ1.2mm) solid welding wire meets the requirements of "Solid Welding Wire of Non-alloy Steel and Fine Grain Steel for Metallic Electrode Gas Shielded Arc Welding" (GB/T8110-2020), and is mainly used for welding of composite plate base; The tensile strength of G49A4UC1S6 solid welding wire is Rm≥500MPa, the yield strength is Rel≥420MPa, the elongation is A≥22%, and the impact energy KV2≥47J at -40℃.

Chemical composition of TS309L-FC11 welding wire: C≦0.04, Si≦1.0, Mn: 1.0-2.5, P≦0.03, S≦0.03, Ni: 12.0-14.0, Cr: 23.0-25.0, MM≦0.75, Cu≦0.75; The performance of TS309L-FC11 (Φ1.2mm) stainless steel welding wire meets the requirements of "Stainless Steel Flux-cored Welding Wire" (GB/T 17853-2018), and is mainly used for welding the transition layer of composite plates; The tensile strength of TS309L-FC11 stainless steel welding wire is Rm≥520MPa, and the elongation is A≥25%;

Chemical composition of TS347L-FC11 welding wire: C≦0.08, Si:0.3-0.65, Mn:1.0-2.5, P≦0.03, S≦0.03, Ni:9.0-11.0, Cr:19.0-21.5, MM≦0.75, Cu≦0.75. The performance of TS347L-FC11 (Φ1.2mm) stainless steel welding wire meets the requirements of "Stainless Steel Flux-cored Welding Wire" (GB/T 17853-2018) and is mainly used for welding the stainless steel layer of composite plates. The tensile strength of TS347L-FC11 stainless steel welding wire is Rm≥520MPa, and the elongation is A≥25%.

Step 2: Butt the two Q345qE steel plates and the S32168 stainless steel composite plate 110 in a horizontal position and process a V-shaped groove at a 45° angle, so that the base layers 130 of the two Q345qE and S32168 stainless steel plates 110 are aligned at the bottom and the stainless steel layers 140 are aligned at the top; when butt-jointing in a horizontal position, control the assembly accuracy gap to be 0 to 1 mm, and the misalignment to be less than 1 mm;

Before welding, mechanical methods and organic solvents should be used to remove oil, rust, metal chips, oxide film and other contaminants within a range of not less than 20mm on the surface of the welding wire and on both sides of the welding V-groove. When multi-layer and multi-pass welding is performed, the slag and defects on the surface of the previous weld should be removed.

Q345qE and S32168 stainless steel composite plate 110 can be cut by plasma cutting or flame cutting. When using plasma cutting, the base layer is at the bottom and the composite layer is at the top to avoid damaging the composite layer. When using flame cutting, the composite layer is at the bottom and the base layer is at the top, and cutting is carried out from the base layer.

Before welding, when the ambient temperature is below 5℃ or the thickness of the stainless steel composite plate is ≥30mm, use a drying gun to evenly preheat both sides of the weld of the stainless steel composite plate to 60-120℃. The preheating range is both sides of the weld, with a width of more than 100mm. Temperature detection method: After heating stops, use a point thermometer to measure on the back of the weldment. The temperature measurement point should be within 30-50mm from the weld.

Step 3: Place the ceramic liner 120 on the back of the V-shaped groove of the two Q345qE and S32168 stainless steel composite plates 110, and perform base layer welding, transition layer welding and stainless steel layer welding from bottom to top to obtain the stainless steel composite plate; when welding the base layer, weld the area 1, area 2, area 3 and area 4 in FIG. 2, using G49A4UC1S6 welding wire and CO ₂ Gas shielded welding, welding current 170 ~ 190A, voltage 24 ~ 28V, gas flow 16 ~ 18L / min, the dry extension length of the welding wire during base welding is 12 ~ 18mm; when welding the transition layer, areas 5 and 6 in Figure 2 are welded, TS309L-FC11 stainless steel welding wire and argon arc welding are used, welding current 100 ~ 120A, voltage 14 ~ 18V, gas flow 12 ~ 14L / min, and the dry extension length of the welding wire during the transition layer welding is 8 ~ 10mm; when welding the stainless steel layer, areas 7, 8, and 9 in Figure 2 are welded, TS347L-FC11 stainless steel welding wire and argon arc welding are used, welding current 110 ~ 130A, voltage 16 ~ 20V, gas flow 12 ~ 14L / min, and the dry extension length of the welding wire during the stainless steel layer welding is 8 ~ 10mm.

When welding, it is advisable to weld the base layer first, and then weld the transition layer after passing the specified quality inspection items, and finally weld the stainless steel layer. When welding the base layer, the weld should not touch or melt the inner wall of the stainless steel layer, and the root or surface of the base layer weld should be 1 to 2 mm away from the stainless steel layer. When welding the transition layer, the thickness of the transition layer should be more than 2 mm. The weld surface should be flat and smooth with the surface of the stainless steel layer, and the excess height of the butt weld should be less than 1.5 mm.

The humidity should be below 80% during welding. The welding environment temperature should be above 5℃ for low alloy high strength structural steel, and the main components should be welded within 24 hours after assembly. When the wind force exceeds level 5, enclosure shielding measures should be taken for _CO2 gas shielded welding. When the wind speed exceeds 0.5m/s, enclosure shielding and windproof measures should be taken for argon arc welding. Open-air welding is prohibited. The base gas shielded welding uses _CO2 with a gas concentration of more than 99.5% as the shielding gas, and the transition layer and stainless steel layer use Ar gas containing 2% volume fraction _O2 as the shielding gas, and spray transition welding. After welding, the welding slag, weld nodules, spatter and other dirt on the surface of the weldment should be removed.

Step 4: After welding is completed, the stainless steel composite plate is inspected and no defects such as cracks, lack of fusion, slag inclusions, weld bumps, etc. are found, and the mechanical properties of the test plate joints meet the standard requirements of various material parameters.

The classification level of stainless steel composite plate is level Ⅰ, the interface bonding level is level Ⅰ, the tensile performance requirements are yield strength ≥ the lower limit of stainless steel composite plate, tensile strength ≥ the lower limit of stainless steel composite plate, and the elongation after fracture is not less than the standard lower limit of the base steel plate; inner bending performance: bending angle 180°, thickness a<20mm, d=2a; a>20mm, d=3a. It is required that no cracks visible to the naked eye should be generated on the outside of the bent part after bending. (a is the total nominal thickness of the stainless steel composite plate, d is the bending diameter); outer bending performance: bending angle 180°, bending core diameter d=4a, it is required that no cracks visible to the naked eye should be generated on the outside of the bent part after bending; shear performance ≥210MPa; impact performance is not less than the standard lower limit of the base steel plate; intergranular corrosion resistance shall be implemented in accordance with the provisions of GB/T4334.

The welding method of the stainless steel composite plate provided in the embodiment of the present application selects G49A4UC1S6 welding wire and _CO2 gas shielded welding to adopt a specific process for base layer welding, selects TS309L-FC11 stainless steel welding wire and argon arc welding to adopt a specific process for transition layer welding, and selects TS347L-FC11 stainless steel welding wire and argon arc welding to adopt a specific process for stainless steel layer welding. The stainless steel composite plate obtained by welding Q345qE and S32168 stainless steel composite plate 110 has good mechanical properties and excellent welding quality, expands the welding method of stainless steel composite plates, and meets the welding requirements of stainless steel composite plates for bridges.

The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

Claims (9)

1. A welding method for a stainless steel composite plate, characterized in that it comprises the following steps: Butt Q345qE and S32168 stainless steel composite plates together and process V-shaped grooves; The base layer welding, transition layer welding and stainless steel layer welding are carried out from bottom to top in sequence to obtain a stainless steel composite plate; when welding the base layer, G49A4UC1S6 welding wire and _CO2 gas shielded welding are used, the welding current is 170-190A, the voltage is 24-28V, and the gas flow rate is 16-18L/min; when welding the transition layer, TS309L-FC11 stainless steel welding wire and argon arc welding are used, the welding current is 100-120A, the voltage is 14-18V, and the gas flow rate is 12-14L/min; when welding the stainless steel layer, TS347L-FC11 stainless steel welding wire and argon arc welding are used, the welding current is 110-130A, the voltage is 16-20V, and the gas flow rate is 12-14L/min. 2. The welding method of the stainless steel composite plate according to claim 1 is characterized in that the Q345qE and S32168 stainless steel composite plates are flatly butt-jointed for assembly and positioning, and then a V-shaped groove is processed, the assembly accuracy gap is 0 to 1 mm, and the misalignment is less than 1 mm. 3. The welding method of the stainless steel composite plate according to claim 1 is characterized in that the dry extension length of the welding wire during base layer welding is 12 to 18 mm. 4. The welding method of the stainless steel composite plate according to claim 1 is characterized in that the dry extension length of the welding wire during transition layer welding is 8 to 10 mm. 5. The welding method of the stainless steel composite plate according to claim 1, characterized in that the dry extension length of the welding wire during welding of the stainless steel layer is 8 to 10 mm. 6. The welding method of stainless steel composite plate according to claim 1 is characterized in that the weld does not touch or melt the inner wall of the stainless steel layer during base welding, and the root or surface of the base welding weld is 1 to 2 mm away from the stainless steel layer. 7. The welding method of the stainless steel composite plate according to claim 1 is characterized in that when the transition layer is welded, the thickness of the transition layer is made to be above 2 mm. 8. The welding method of the stainless steel composite plate according to claim 1, characterized in that when the stainless steel layer is welded, the excess height of the butt weld is less than 1.5 mm. 9. The welding method of the stainless steel composite plate according to claim 1 is characterized in that before the base layer welding, transition layer welding and stainless steel layer welding are carried out sequentially from bottom to top, when the ambient temperature is below 5°C or the plate thickness of the stainless steel composite plate is ≥30mm, both sides of the weld of the stainless steel composite plate before welding are preheated to 60-120°C.