CN1654160A - Niobium-titanium-boron microalloy high strength gas shielded welding wire - Google Patents
Niobium-titanium-boron microalloy high strength gas shielded welding wire Download PDFInfo
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- CN1654160A CN1654160A CN 200510060033 CN200510060033A CN1654160A CN 1654160 A CN1654160 A CN 1654160A CN 200510060033 CN200510060033 CN 200510060033 CN 200510060033 A CN200510060033 A CN 200510060033A CN 1654160 A CN1654160 A CN 1654160A
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- 238000003466 welding Methods 0.000 title claims abstract description 82
- SIIBMYCILWACLK-UHFFFAOYSA-N [B].[Ti].[Nb] Chemical compound [B].[Ti].[Nb] SIIBMYCILWACLK-UHFFFAOYSA-N 0.000 title claims description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 30
- 239000002184 metal Substances 0.000 abstract description 30
- 229910000831 Steel Inorganic materials 0.000 abstract description 12
- 239000010959 steel Substances 0.000 abstract description 12
- 229910045601 alloy Inorganic materials 0.000 abstract description 8
- 239000000956 alloy Substances 0.000 abstract description 8
- 229910052796 boron Inorganic materials 0.000 abstract description 7
- 229910052748 manganese Inorganic materials 0.000 abstract description 6
- 229910052758 niobium Inorganic materials 0.000 abstract description 6
- 229910052719 titanium Inorganic materials 0.000 abstract description 6
- 229910052710 silicon Inorganic materials 0.000 abstract description 5
- 239000011229 interlayer Substances 0.000 abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 14
- 239000007789 gas Substances 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 239000010955 niobium Substances 0.000 description 11
- 229910000859 α-Fe Inorganic materials 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000009466 transformation Effects 0.000 description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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- Arc Welding In General (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
Description
技术领域technical field
本发明涉及一种铌钛硼微合金高强度气体保护焊丝。该焊丝采用M21混合气体(80％Ar+20％CO2)保护焊接时，焊丝工艺性能良好，具有焊接电弧稳定、飞溅小、成型美观、适应于全位置焊接等优点。同时，在适当控制焊接工艺参数和层间温度条件下，焊缝金属的屈服强度≥690MPa，抗拉强度≥800MPa，-30℃冲击功Akv≥100J，适用于800MPa级低合金高强度结构钢的气体保护电弧焊。The invention relates to a niobium-titanium-boron microalloy high-strength gas shielded welding wire. When the welding wire is welded with M21 mixed gas (80% Ar+20% CO 2 ), the welding wire has good technological performance, and has the advantages of stable welding arc, small spatter, beautiful shape, and is suitable for all-position welding. At the same time, under the conditions of proper control of welding process parameters and interlayer temperature, the yield strength of the weld metal is ≥690MPa, the tensile strength is ≥800MPa, and the impact energy A kv ≥100J at -30°C is suitable for 800MPa-level low-alloy high-strength structural steel gas shielded arc welding.
背景技术Background technique
目前在海洋舰船、工程机械、输油管线重要大型焊接结构的设计和制作过程中，为了减轻自重、降低能耗、提高寿命，逐步采用了高强度与高韧性兼备的结构钢板，对相应配套气体保护焊丝的需求也正在日益增加。但气体保护焊丝的品种单一，迄今为止，尚无成熟的800MPa级商品化气体保护焊丝。日本专利P2000-218391A公开了一种气体保护焊丝，该焊丝的焊缝金属具有良好的低温冲击韧性，但不足之处是抗拉强度不能达到800MPa。ESAB公司生产的ST800混合气体保护焊丝，熔敷金属抗拉强度虽已达到800MPa，但不足之处是其冲击韧性不能满足结构在低温服役下的使用要求。国内开发的一种气体保护焊丝，相应焊缝金属的强度和韧性均能与800MPa级钢板匹配，但因焊丝中加入了大量的镍(≥3.85wt％)，成本偏高。At present, in the design and production process of important large-scale welded structures of marine ships, construction machinery, and oil pipelines, in order to reduce dead weight, reduce energy consumption, and improve service life, structural steel plates with both high strength and high toughness are gradually adopted. The demand for shielded welding wire is also increasing day by day. But the variety of gas-shielded welding wire is single, so far, there is no mature 800MPa-level commercial gas-shielded welding wire. Japanese patent P2000-218391A discloses a gas-shielded welding wire. The weld metal of the welding wire has good low-temperature impact toughness, but the disadvantage is that the tensile strength cannot reach 800 MPa. Although the tensile strength of the deposited metal has reached 800MPa for ST800 mixed gas shielded welding wire produced by ESAB, its shortcoming is that its impact toughness cannot meet the requirements of the structure in low temperature service. A gas-shielded welding wire developed in China can match the strength and toughness of the corresponding weld metal with the 800MPa steel plate, but the cost is high because a large amount of nickel (≥3.85wt%) is added to the welding wire.
发明内容Contents of the invention
本发明的目的是提供一种焊缝金属组织性能均匀、抗拉强度≥800Mpa、低温冲击韧性高、焊接工艺性能良好、生产成本相对较低、广泛用于相应强度级别低合金高强钢重要结构多层焊的气体保护焊丝。The purpose of the present invention is to provide a weld metal with uniform structure and properties, tensile strength ≥ 800Mpa, high low-temperature impact toughness, good welding process performance, relatively low production cost, widely used in many important structures of low-alloy high-strength steel with corresponding strength levels Gas-shielded wire for layer welding.
为达到上述目的，本发明提出了一种熔敷金属强度高、低温韧性好的气体保护焊丝，其特征是在焊缝中采用铌钛硼微合金化和焊丝的化学成份设计(wt％)：C 0.04～0.15、Mn 1.00～2.00、Si 0.30～1.20、Ni0.60～1.80、Ti 0.08～0.20、Mo 0.10～0.80、Nb 0.01～0.05、B0.002～0.012、S≤0.10、P≤0.20、余量为Fe及不可避免的杂质元素。In order to achieve the above object, the present invention proposes a gas-shielded welding wire with high strength of deposited metal and good low-temperature toughness, which is characterized in that niobium-titanium-boron microalloying and chemical composition design (wt%) of the welding wire are adopted in the weld seam: C 0.04～0.15, Mn 1.00～2.00, Si 0.30～1.20, Ni0.60～1.80, Ti 0.08～0.20, Mo 0.10～0.80, Nb 0.01～0.05, B0.002～0.012, S≤0.10, P≤0.20, The balance is Fe and unavoidable impurity elements.
要使焊缝金属抗拉强度达到≥800MPa的同时，又获得良好的低温冲击韧性，关键是形成以高密度位错细针状铁素体为主的焊缝组织。为此，本发明在焊丝中加入了适量的铌、硼和其它合金元素，当这些合金元素过渡到焊缝中时，对焊缝组织和性能的作用机制是：To make the tensile strength of the weld metal reach ≥ 800 MPa and at the same time obtain good low-temperature impact toughness, the key is to form a weld structure dominated by high-density dislocation fine acicular ferrite. For this reason, the present invention has added appropriate amount of niobium, boron and other alloying elements in the welding wire, when these alloying elements transition in the weld, the mechanism of action on the structure and performance of the weld is:
微量B在焊缝连续冷却过程中非平衡偏聚在奥氏体晶界上，将抑制先共析铁素体的形核，扩大针状铁素体转变的区域；Nb、B复合加入时，明显降低针状铁素体的起始转变温度，以提高针状铁素体的位错密度。另外，在板条间形成的Nb(C，N)的微小颗粒钉杂在板条边界上可有效阻碍板条的粗化，使在多层焊时，焊缝金属的组织和性能保持均匀稳定。The non-equilibrium segregation of trace B on the austenite grain boundary during the continuous cooling of the weld will inhibit the nucleation of proeutectoid ferrite and expand the transformation area of acicular ferrite; when Nb and B are added in combination, Significantly lower the initial transformation temperature of acicular ferrite to increase the dislocation density of acicular ferrite. In addition, the tiny particles of Nb(C,N) formed between the laths can effectively hinder the coarsening of the laths on the boundaries of the laths, so that the structure and properties of the weld metal remain uniform and stable during multi-layer welding. .
为防止B的氧化和氮化，在焊丝中加入了Ti。在熔滴过渡和熔池反应阶段，形成Ti、Si、Mn、Al等的氧化物夹杂或氧硫复合夹杂物。其中部分夹杂物在高温下长大，分离而进入渣中，部分因快速冷却而留在焊缝中。当奥氏体过冷到针状铁素体转变区域时，夹杂物诱发针状铁素体在晶内形核。相比之下，Ti的氧化物具有更强的促进晶内异质形核的作用。In order to prevent the oxidation and nitriding of B, Ti is added to the welding wire. In the stage of droplet transfer and molten pool reaction, oxide inclusions or oxygen-sulfur composite inclusions of Ti, Si, Mn, Al, etc. are formed. Some of the inclusions grow up at high temperature, separate and enter the slag, and some are left in the weld due to rapid cooling. When the austenite is supercooled to the acicular ferrite transformation region, the inclusions induce the intragranular nucleation of acicular ferrite. In contrast, Ti oxides have a stronger role in promoting intragranular heterogeneous nucleation.
因此，当Nb、Ti、B联合加入时，三者之间存在交互作用，在一定适宜的匹配范围，即将焊丝中Ti含量控制在0.08～0.20％、B含量控制在0.002～0.012％，、Nb含量控制在0.01～0.05％时，可以在焊缝中创造有利于获得大量高密度位错细针状铁素体的动力学条件。Therefore, when Nb, Ti, and B are jointly added, there is an interaction between the three, and within a certain suitable matching range, the Ti content in the welding wire is controlled at 0.08-0.20%, and the B content is controlled at 0.002-0.012%. When the content is controlled at 0.01-0.05%, dynamic conditions favorable for obtaining a large amount of high-density dislocation fine acicular ferrite can be created in the weld.
焊丝中还添加了C、Mn、Si、Ni、Mo等其它合金元素，其加入范围和作用是：C, Mn, Si, Ni, Mo and other alloying elements are also added to the welding wire. The scope and function of the addition are:
焊丝中的C含量控制在0.05～0.15％。焊丝中加入适宜的C，主要作用是保证焊缝金属具有一定的淬透性。其次要作用是形成Nb、Ti等的第二相粒子。另外，一定的碳含量还有助于改善熔滴过渡特性和电弧稳定性。但过多的C会使焊缝金属淬硬性增加，塑性降低，裂纹敏感性增加。The C content in the welding wire is controlled at 0.05-0.15%. The main function of adding appropriate C to the welding wire is to ensure that the weld metal has a certain hardenability. The secondary function is to form the second phase particles of Nb, Ti, etc. In addition, a certain carbon content also helps to improve the droplet transfer characteristics and arc stability. But too much C will increase the hardenability of the weld metal, reduce the plasticity and increase the crack sensitivity.
焊丝中的Si含量控制在0.20～1.00。在气体保护焊丝中，Si是主要的脱氧及强化元素之一，当焊丝中Si的含量低于0.20％时，脱氧不充分，使焊缝中氧含量过高；当焊缝中Si含量过高时，会使焊缝金属硬化，焊接飞溅增加，焊丝工艺性能下降。The Si content in the welding wire is controlled at 0.20-1.00. In gas shielded welding wire, Si is one of the main deoxidizing and strengthening elements. When the content of Si in the welding wire is lower than 0.20%, the deoxidation is insufficient and the oxygen content in the weld is too high; when the Si content in the weld is too high At the same time, the weld metal will harden, the welding spatter will increase, and the performance of the welding wire will decrease.
焊丝中的Mn含量控制在1.00～2.00内。Mn与Si起联合脱氧作用，当焊缝中Mn/Si≈3时，具有较好的脱氧效果。当焊丝中Mn含量低于1.00时，在熔滴和熔池反应阶段脱氧不充分，使焊缝中氧含量过高，且使焊缝强度偏低。当焊丝中Mn含量过高时，易造成Mn的偏析，在锰偏析带易产生M-A岛状组织，降低焊缝金属的塑性，焊缝金属的低温冲击韧性明显下降。The Mn content in the welding wire is controlled within 1.00-2.00. Mn and Si play a joint deoxidation effect, and when Mn/Si≈3 in the weld, it has a better deoxidation effect. When the Mn content in the welding wire is lower than 1.00, the deoxidation is insufficient in the reaction stage of the droplet and the molten pool, so that the oxygen content in the weld is too high, and the weld strength is low. When the Mn content in the welding wire is too high, it is easy to cause Mn segregation, and the M-A island structure is easy to be formed in the manganese segregation zone, which reduces the plasticity of the weld metal, and the low temperature impact toughness of the weld metal decreases significantly.
焊丝中的Ni含量控制在0.60～1.80。Ni明显提高焊缝金属的韧性，尤其是其低温冲击韧性，降低脆性转变温度。同时Ni在焊缝金属中起着重要的强化作用。因此，焊丝中的Ni含量不应低于0.60，但Ni属于贵重元素，不宜多加。The Ni content in the welding wire is controlled at 0.60-1.80. Ni significantly improves the toughness of the weld metal, especially its low-temperature impact toughness, and reduces the brittle transition temperature. At the same time, Ni plays an important strengthening role in the weld metal. Therefore, the Ni content in the welding wire should not be lower than 0.60, but Ni is a precious element and should not be added more.
焊丝中的Mo含量控制在0.10～0.80。适量Mo与B联合加入时，可以抑制先共析铁素体转变，促进过冷奥氏体在中温区的转变。但过高的Mo含量会导致焊缝金属塑性下降、冷裂纹敏感性增加。The Mo content in the welding wire is controlled at 0.10-0.80. When an appropriate amount of Mo and B are added together, it can inhibit the transformation of proeutectoid ferrite and promote the transformation of supercooled austenite in the medium temperature region. However, too high Mo content will lead to a decrease in the plasticity of the weld metal and an increase in the sensitivity to cold cracks.
S、P元素对焊缝金属低温韧性有危害作用，应尽量降低。要求焊丝中S≤0.10、P≤0.20。S and P elements have harmful effects on the low-temperature toughness of the weld metal and should be reduced as much as possible. It is required that S≤0.10 and P≤0.20 in the welding wire.
总之，本发明通过对气体保护焊丝进行合理的化学成份设计，对焊缝金属进行了合适的Nb、Ti、B微合金化，从而在焊缝中稳定获得了大量的、具有高密度位错的针状铁素体；在板条间形成的Nb(C，N)的微小颗粒钉杂在板条边界上，可有效阻碍板条的粗化。焊丝中加入适量的Si、Mn，强化焊缝中铁素体基体，并对焊缝进行联合脱氧，使焊缝中的氧含量适中。焊丝中加入适量的Ni，以进一步提高焊缝金属的强度和低温冲击韧性。焊丝加入适量的Mo，以促进过冷奥氏体的中温转变；合理的焊丝成份设计使焊缝金属具有了合适的合金体系，并最终使焊缝具有优异的强韧性匹配。本发明焊丝具有如下优点：In a word, the present invention conducts appropriate microalloying of Nb, Ti, and B on the weld metal through reasonable chemical composition design of the gas-shielded welding wire, thereby stably obtaining a large number of dislocations with high density in the weld. Acicular ferrite; the tiny particles of Nb(C,N) formed between the laths are mixed on the lath boundaries, which can effectively hinder the coarsening of the laths. Add appropriate amount of Si and Mn to the welding wire to strengthen the ferrite matrix in the weld, and carry out combined deoxidation on the weld to make the oxygen content in the weld moderate. An appropriate amount of Ni is added to the welding wire to further improve the strength and low temperature impact toughness of the weld metal. An appropriate amount of Mo is added to the welding wire to promote the medium temperature transformation of supercooled austenite; the reasonable design of the welding wire composition makes the weld metal have a suitable alloy system, and finally makes the weld have excellent strength and toughness matching. The welding wire of the present invention has the following advantages:
1.采用混合气体(80％Ar+20％CO2)保护电弧焊时，在控制适宜的焊接工艺参数和层间温度条件下，焊缝金属的抗拉强度达到≥800MPa，-30℃冲击功Akv≥100J，且多层焊时，焊缝金属性能均匀稳定。可广泛用于工程机械、铁路桥梁、海洋设施、高压容器、油气管线等大型重要结构800MPa级低合金高强钢的焊接。1. When using mixed gas (80% Ar+20% CO 2 ) shielded arc welding, under the control of suitable welding process parameters and interlayer temperature conditions, the tensile strength of the weld metal can reach ≥800MPa, and the impact energy at -30°C A kv ≥ 100J, and when multi-layer welding, the weld metal performance is uniform and stable. It can be widely used in the welding of 800MPa low-alloy high-strength steel for large-scale important structures such as construction machinery, railway bridges, marine facilities, high-pressure vessels, and oil and gas pipelines.
2.该焊丝采用M21混合气体(80％Ar+20％CO2)保护焊接时，焊丝工艺性能良好，焊接电弧稳定、飞溅小、无气孔、成型美观、适应于全位置焊接。2. When the welding wire is welded with M21 mixed gas (80% Ar+20% CO 2 ) protection welding, the welding wire has good process performance, stable welding arc, small spatter, no porosity, beautiful shape, and is suitable for all-position welding.
3.本发明焊丝所用合金体系合适，其盘条的冶炼、轧制及焊丝的拉拔、镀铜容易实现，生产成本较低。3. The alloy system used in the welding wire of the present invention is suitable, the smelting and rolling of the wire rod, the drawing and copper plating of the welding wire are easy to realize, and the production cost is relatively low.
具体实施方式Detailed ways
下面用实施例对本发明焊丝作进一步详述：Below with embodiment welding wire of the present invention is described in further detail:
实施例：选用低S、P废钢原料，采用0.2吨电炉进行焊丝钢冶炼。冶炼过程中注意控制钢中气体含量和合金加入顺序。焊丝钢的化学成份为(wt％)：C 0.065、Mn 1.82、Si 0.58、S 0.0062、P 0.014、Ni1.42、Ti 0.18、Mo 0.32、B 0.0078、Nb 0.024。冶炼后将焊丝钢经轧制、拉拔、表面镀铜等工序加工成规格为Φ1.2mm的焊丝。Embodiment: select low S, P steel scrap raw materials, adopt 0.2 ton electric furnace to carry out welding wire steel smelting. During the smelting process, attention should be paid to controlling the gas content in the steel and the order of alloy addition. The chemical composition of welding wire steel is (wt%): C 0.065, Mn 1.82, Si 0.58, S 0.0062, P 0.014, Ni1.42, Ti 0.18, Mo 0.32, B 0.0078, Nb 0.024. After smelting, the welding wire steel is processed into welding wire with a specification of Φ1.2mm through rolling, drawing, surface copper plating and other processes.
本发明焊丝采用混合气体(80％Ar+20％CO2)保护进行熔敷金属试板的焊接，随即对熔敷金属的力学性能和焊丝的工艺性能进行了评定。焊接规范为：焊接电流230～270A，焊接电压23～25，焊接速度21.5cm/min，气体流量18L/min，焊接线能量17.2KJ/cm。焊接板厚18mm，坡口角度45°，带10mm垫板，根部间隙为16mm。熔敷金属的力学性能为：σs＝696MPa，σb＝824MPa，δ5＝17％，ψ＝63％，熔敷金属系列温度冲击功Akv分别为152J(20℃)、134J(-20℃)、125J(-30℃)、102J(-40℃)。The welding wire of the invention adopts the protection of mixed gas (80% Ar+20% CO 2 ) to weld the deposited metal test plate, and then evaluates the mechanical properties of the deposited metal and the process performance of the welding wire. The welding specifications are: welding current 230-270A, welding voltage 23-25, welding speed 21.5cm/min, gas flow 18L/min, welding line energy 17.2KJ/cm. The thickness of the welded plate is 18mm, the groove angle is 45°, with a 10mm backing plate, and the root gap is 16mm. The mechanical properties of the deposited metal are: σ s = 696MPa, σ b = 824MPa, δ 5 = 17%, ψ = 63%, and the temperature impact energy A kv of the deposited metal series is 152J (20°C), 134J (-20 ℃), 125J(-30℃), 102J(-40℃).
焊丝采用混合气体(80％Ar+20％CO2)保护，进行工程机械用钢HQ620DB平焊对接检验。HQ620DB钢板化学成份为(wt％)：C 0.055、Si 0.267、Mn 1.482、P 0.010、S 0.003、Nb 0.045、Ni 0.304、Mo 0.156、Cu0.538、Ti 0.021，钢板抗拉强度σb为775MPa。焊接规范为：焊接电流220～240A，焊接电压22～24V，焊接速度20～22cm/min，平均焊接线能量17.3KJ/cm。焊接板厚20mm，坡口角度75°，钝边1mm，根部不留间隙。焊缝金属的化学成份为(wt％)：C 0.048、Si 0.46、Mn 1.62、P0.012、S 0.004、Ni 1.22、Mo 0.24、Ti 0.044、Nb 0.023、B 0.0074。接头板拉检验结果反映接头断在焊缝外16mm处，焊缝金属系列温度冲击功Akv分别为157J(0℃)、138J(-30℃)、132J(-40℃)、121J(-50℃)。焊接接头冷弯d＝3a、180°完好。The welding wire is protected by mixed gas (80% Ar+20% CO 2 ), and the flat welding butt joint inspection of engineering machinery steel HQ620DB is carried out. The chemical composition of HQ620DB steel plate is (wt%): C 0.055, Si 0.267, Mn 1.482, P 0.010, S 0.003, Nb 0.045, Ni 0.304, Mo 0.156, Cu0.538, Ti 0.021, and the tensile strength σ b of the steel plate is 775MPa. The welding specification is: welding current 220-240A, welding voltage 22-24V, welding speed 20-22cm/min, average welding heat input 17.3KJ/cm. The thickness of the welded plate is 20mm, the groove angle is 75°, the blunt edge is 1mm, and there is no gap at the root. The chemical composition of the weld metal is (wt%): C 0.048, Si 0.46, Mn 1.62, P0.012, S 0.004, Ni 1.22, Mo 0.24, Ti 0.044, Nb 0.023, B 0.0074. The results of the joint plate pull test show that the joint is broken at 16mm outside the weld, and the temperature impact energy A kv of the weld metal series is 157J (0°C), 138J (-30°C), 132J (-40°C), 121J (-50°C) ℃). Welded joint cold bending d=3a, 180° intact.
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