CN109702302A - Dissimilar steel welding technology - Google Patents
Dissimilar steel welding technology Download PDFInfo
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- CN109702302A CN109702302A CN201910060060.5A CN201910060060A CN109702302A CN 109702302 A CN109702302 A CN 109702302A CN 201910060060 A CN201910060060 A CN 201910060060A CN 109702302 A CN109702302 A CN 109702302A
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Abstract
The invention discloses dissimilar steel welding technologies, it is related to welding procedure field, including polishing Q345B and ZG43SiMnH dissimilar steel base material to be welded, retaining wall on slope and welding group pair, the pre-heat treatment is carried out to Q345B and ZG43SiMnH dissimilar steel base material to be welded, it is welded using gas shielded arc welding, protective gas uses at least one of CO2 and Ar, prime coat welding, it is welded using gas shielded arc welding, welding current is 100A, weldingvoltage is 20V, filled layer welding, it is welded using gas shielded arc welding, welding current is 120A, weldingvoltage is 21V, the welding of capping layer, it is welded using gas shielded arc welding, welding current is 120A, weldingvoltage is 21V, to the Q345B and ZG43S obtained after welding IMnH Dissimilar Steel Welded Joint carries out post weld heat treatment.The material when present invention passes through multi-layer welding has better toughness, can preferably carry out using substantially increasing the mechanical performance of material.
Description
Technical field
The present invention relates to welding procedure fields, in particular to dissimilar steel welding technology.
Background technique
The steel of material not of the same race become different steel weld by the process that welding method is fused together, at room temperature,
When welding to Q345B and ZG43SiMnH dissimilar steel, the mechanical performance in metal welding joints area is generally preferred over by weldering base material
Performance, but under high temperature or after high temperature longtime running, the performance of connector area is inferior to base material, the shakiness of connector fusion area tissue and performance
It is qualitative, the fusion area between base material and weld metal, since there is apparent macroscopical uneven chemical components, just
Cause the great inhomogeneities of tissue, brings very big influence, postwelding heat to the physical property, chemical property, mechanical property of connector
Carbon diffusion, which will lead to, during processing or hot operation is respectively formed carburetting layer and decarburized layer in melt run two sides.
It is generally acknowledged that decarburized layer due to carbon reduction and cause the regional organization, performance to vary widely so that
The region is easy that initial failure occurs during military service, and post weld heat treatment is more intractable problem, the weldering of dissimilar steel joint
Heat treatment is a problem of comparison difficulty is set afterwards, if mishandling, the mechanical property of the badly damaged dissimilar steel joint of meeting, very
To causing to crack, the inhomogeneities of metallographic structure is discontinuous due to welding point chemical component, experienced Thermal Cycle
Afterwards, there is different tissues in welding point each region, often occurs extremely complex institutional framework in some regions.
Summary of the invention
The purpose of the present invention is to provide dissimilar steel welding technologies, to solve the problems mentioned in the above background technology.
To achieve the above object, the invention provides the following technical scheme: dissimilar steel welding technology, for Q345B and
The welding procedure of ZG43SiMnH dissimilar steel the following steps are included:
Step 1: it is polished Q345B and ZG43SiMnH dissimilar steel base material to be welded, retaining wall on slope and welding group
It is right；
Step 2: the pre-heat treatment is carried out to Q345B and ZG43SiMnH dissimilar steel base material to be welded；
Step 3: being welded using gas shielded arc welding, and protective gas uses at least one of CO2 and Ar；
Step 4: prime coat welding is welded, welding current 100A, weldingvoltage is using gas shielded arc welding
20V；
Step 5: filled layer welding is welded, welding current 120A, weldingvoltage is using gas shielded arc welding
21V；
Step 6: the welding of capping layer is welded, welding current 120A, weldingvoltage is using gas shielded arc welding
21V；
Step 7: post weld heat treatment is carried out to Q345B the and ZG43SiMnH Dissimilar Steel Welded Joint obtained after welding.
Preferably, in said step 1, to Q345B and ZG43SiMnH dissimilar steel base material retaining wall on slope to be welded, slope
Bicker degree is 60 ± 2.5 °.
Preferably, in the step 2, to Q345B and ZG43SiMnH dissimilar steel base material to be welded oxy-acetylene fire
Flame preheating, preheating temperature are 200 DEG C~300 DEG C.
Preferably, at least one of welding model ERNiCr-3, NICrFe-3 and T-HR3C that multi-layer welding uses.
Preferably, when filled layer welding and capping layer weld, selecting the diameter dimension of welding rod is φ 3.2mm.
Preferably, the flow of protective gas is 100 ± 5mm/min.
Preferably, the temperature of heat treatment is 720 DEG C~860 DEG C, and the time is 1~3h.
Preferably, after welding, slow cooling is kept the temperature to environment temperature with asbestos cloth.
Technical effect and advantage of the invention:
1, the present invention polished first Q345B and ZG43SiMnH dissimilar steel base material, retaining wall on slope and welding group pair,
It polishes Q345B the and ZG43SiMnH dissimilar steel base material of welding, removes oxide skin, the greasy dirt, iron rust, moisture on surface
Equal impurity, are convenient for welding, and improve the intensity of dissimilar steel when welding, while to Q345B the and ZG43SiMnH xenogenesis of welding
Steel base material carry out groove processing so that welding Q345B and ZG43SiMnH dissimilar steel base material when being welded, can be more
It is secured, be convenient for fixing, Q345B and ZG43SiMnH preferably welded, welding when will not be easily
It cracks；
2, the present invention carries out the double-deck three passages welding using welding wire butt joint, and the weld width of single pass is gage of wire
Two times, while prime coat welding is carried out, welding current 100A, weldingvoltage 20V, filled layer weld, and welding current is
120A, weldingvoltage 21V, the welding of capping layer, welding current 120A, weldingvoltage 21V, using CO2 protective gas, and
Flow is 100 ± 5mm/min, using multi-layer welding, can make the material after welding at high temperature or after high temperature longtime running,
The performance of connector area is bad more stable；
3, in post weld heat treatment of the present invention, welding point is freely warming up to 350 DEG C by the first stage；Second stage, with
Welding point is heated to 600 DEG C by the heating rate of 120 DEG C/h, and keeps the temperature 2 hours at 750 DEG C；Phase III, with 120
DEG C/cooling rate of h, welding point is cooled to 350 DEG C；Welding point is freely cooled to room temperature, is welded by fourth stage
It practices midwifery product, can preferably improve the mechanical performance of material after welding, so that material has better toughness.
Specific embodiment
Technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the examples below.
Embodiment 1
Dissimilar steel welding technology, for the welding procedure of Q345B and ZG43SiMnH dissimilar steel:
It is polished Q345B and ZG43SiMnH dissimilar steel base material to be welded, retaining wall on slope and welding group pair, first
It polishes Q345B the and ZG43SiMnH dissimilar steel base material of welding, removes oxide skin, the greasy dirt, iron rust, moisture on surface
Equal impurity, are convenient for welding, while carrying out groove processing to Q345B the and ZG43SiMnH dissimilar steel base material of welding, so that weldering
Q345B the and ZG43SiMnH dissimilar steel base material connect more securely can be convenient for fixing when being welded；
The pre-heat treatment is carried out to Q345B and ZG43SiMnH dissimilar steel base material to be welded, before welding, while to Q345B and
ZG43SiMnH dissimilar steel base material carries out weld preheating processing.If cannot be subjected in time, after reaching preheating temperature
Heat preservation operation directly is carried out, until welding operation starts, remains that Q345B and ZG43SiMnH Dissimilar Steels masterbatch is in pre-
Hot temperature；
It is welded using gas shielded arc welding, protective gas uses at least one of CO2 and Ar, prime coat welding, using gas
Body protection is welded, welding current 100A, weldingvoltage 20V, when carrying out prime coat welding, it is ensured that wire feed speed
The uniformity of degree avoids generating non-fusion phenomenon in the root of weld, and molten iron transition uses free transition, fills up arc when receiving arc
Hole avoids generating crater crack, and filled layer welding is welded, welding current 120A, weldingvoltage using gas shielded arc welding
For 21V, the welding of capping layer is welded, welding current 120A, weldingvoltage 21V using gas shielded arc welding, by interlayer temperature
Degree control is within 250 DEG C, to prevent temperature is excessively high from causing weld grain coarse, the plasticity and toughness of Welded Joints are generated
Adverse effect can select the mode of multi-pass welding when carrying out prime coat welding, filled layer welding and the welding of capping layer.It is logical
It crosses using reduction when multi-pass welding to weld seam heat input, realization is precisely controlled heat input, to inhibit weld seam temperature
Heat is spent, coarse grains are avoided, improves the mechanical performance of weld seam；
Post weld heat treatment is carried out to Q345B the and ZG43SiMnH Dissimilar Steel Welded Joint obtained after welding.
Embodiment 2
The dissimilar steel welding technology of the present embodiment, substantially with embodiment 1, the difference is that in the present embodiment:
To Q345B and ZG43SiMnH dissimilar steel base material retaining wall on slope to be welded, bevel angle is 60 ± 2.5 °, groove
The mouth section of lower section is with a thickness of 1.5mm；Q345B and ZG43SiMnH dissimilar steel alignment clearance is 1~4mm.
In the step 2, Q345B and ZG43SiMnH dissimilar steel base material to be welded is preheated with oxyacetylene torch,
Preheating temperature is 200 DEG C~300 DEG C.
At least one of welding model ERNiCr-3, NICrFe-3 and T-HR3C that multi-layer welding uses, filled layer
When welding and the welding of capping layer, selecting the diameter dimension of welding rod is φ 3.2mm.
The double-deck three passages welding is carried out using welding wire butt joint, the weld width of single pass is two times of gage of wire；Its
Middle prime coat welding, is welded, welding current 100A, weldingvoltage 20V using gas shielded arc welding, filled layer welding,
It is welded using gas shielded arc welding, welding current 120A, weldingvoltage 21V, capping layer welding, using gas shielded arc welding
It is welded, welding current 120A, weldingvoltage 21V, the flow of protective gas is 100 ± 5mm/min.
The temperature of heat treatment is 720 DEG C~860 DEG C, and the time is 1~3h, after welding, extremely with asbestos cloth heat preservation slow cooling
Environment temperature.
Embodiment 3
The dissimilar steel welding technology of the present embodiment, in conjunction with the embodiments 1 and embodiment 2 have:
Take one section of Q345B steel and one section of ZG43SiMnH steel base material.Firstly, by two sections of Q345B to be welded and
The welding position of ZG43SiMnH dissimilar steel base material is processed as 60 ° of double V-groove, and to groove face and its peripheral region into
Row cleaning treatment avoids the presence of impurity and pollutant.To Q345B the and ZG43SiMnH dissimilar steel base material for completing retaining wall on slope
It is grouped, group controls between 1~4mm gap.Then, to Q345B the and ZG43SiMnH xenogenesis for completing retaining wall on slope
Steel base material carries out weld preheating processing, and controls preheating temperature at 140 DEG C by far infrared temperature measurement instrument.Then prime coat is carried out
Welding, is welded, welding current 100A, weldingvoltage 20V using CO2 gas shielded arc welding, filled layer welding, using gas
Body protection is welded, welding current 120A, weldingvoltage 21V, and the welding of capping layer is welded using gas shielded arc welding
It connects, welding current 120A, weldingvoltage 21V, the flow of protective gas is 100 ± 5mm/min.Finally, to being obtained after welding
Q345B the and ZG43SiMnH Dissimilar Steel Welded Joint obtained carries out post weld heat treatment.Wherein, in post weld heat treatment, the first stage,
Welding point is freely warming up to 350 DEG C；Welding point is heated to 600 DEG C with the heating rate of 120 DEG C/h by second stage,
And 2 hours are kept the temperature at 750 DEG C；Welding point is cooled to 350 DEG C with the cooling rate of 120 DEG C/h by the phase III；The
Welding point is freely cooled to room temperature, obtains welding product by four stages.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (8)
1. dissimilar steel welding technology, which is characterized in that the welding procedure for Q345B and ZG43SiMnH dissimilar steel includes following
Step:
Step 1: it is polished Q345B and ZG43SiMnH dissimilar steel base material to be welded, retaining wall on slope and welding group pair；
Step 2: the pre-heat treatment is carried out to Q345B and ZG43SiMnH dissimilar steel base material to be welded；
Step 3: being welded using gas shielded arc welding, and protective gas uses at least one of CO2 and Ar；
Step 4: prime coat welding is welded, welding current 100A, weldingvoltage 20V using gas shielded arc welding；
Step 5: filled layer welding is welded, welding current 120A, weldingvoltage 21V using gas shielded arc welding；
Step 6: the welding of capping layer is welded, welding current 120A, weldingvoltage 21V using gas shielded arc welding；
Step 7: post weld heat treatment is carried out to Q345B the and ZG43SiMnH Dissimilar Steel Welded Joint obtained after welding.
2. dissimilar steel welding technology according to claim 1, it is characterised in that: in said step 1, to be welded
Q345B and ZG43SiMnH dissimilar steel base material retaining wall on slope, bevel angle are 60 ± 2.5 °.
3. dissimilar steel welding technology according to claim 1, it is characterised in that: in the step 2, to be welded
Q345B and ZG43SiMnH dissimilar steel base material is preheated with oxyacetylene torch, and preheating temperature is 200 DEG C~300 DEG C.
4. dissimilar steel welding technology according to claim 1, it is characterised in that: the welding model that multi-layer welding uses
At least one of ERNiCr-3, NICrFe-3 and T-HR3C.
5. dissimilar steel welding technology according to claim 4, it is characterised in that: when filled layer welding and the welding of capping layer,
The diameter dimension for selecting welding rod is φ 3.2mm.
6. dissimilar steel welding technology according to claim 1, it is characterised in that: the flow of protective gas is 100 ± 5mm/
min。
7. dissimilar steel welding technology according to claim 1, it is characterised in that: the temperature of heat treatment is 720 DEG C~860
DEG C, the time is 1~3h.
8. dissimilar steel welding technology according to claim 1, it is characterised in that: after welding, kept the temperature with asbestos cloth slow
It is cooled to environment temperature.
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| CN201910060060.5A CN109702302A (en) | 2019-01-22 | 2019-01-22 | Dissimilar steel welding technology |
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| CN201910060060.5A CN109702302A (en) | 2019-01-22 | 2019-01-22 | Dissimilar steel welding technology |
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Citations (6)
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| CN1935438A (en) * | 2006-06-09 | 2007-03-28 | 浙江省火电建设公司 | P92 steel welding process |
| CN101462190A (en) * | 2009-01-13 | 2009-06-24 | 中国建筑第六工程局有限公司 | Low temperature welding method between cast steel and low-alloy structural steel |
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| CN107498143A (en) * | 2017-08-18 | 2017-12-22 | 中国核工业二三建设有限公司 | The welding method of P355NH and 18MnD5 dissimilar steels |
| CN108655546A (en) * | 2017-03-30 | 2018-10-16 | 南阳二机石油装备集团股份有限公司 | Dissimilar steel welding technology method |
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2019
- 2019-01-22 CN CN201910060060.5A patent/CN109702302A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| CN1935438A (en) * | 2006-06-09 | 2007-03-28 | 浙江省火电建设公司 | P92 steel welding process |
| CN101462190A (en) * | 2009-01-13 | 2009-06-24 | 中国建筑第六工程局有限公司 | Low temperature welding method between cast steel and low-alloy structural steel |
| CN105108451A (en) * | 2015-08-10 | 2015-12-02 | 安徽富煌钢构股份有限公司 | Welding method for dissimilar steel plate |
| CN105108283A (en) * | 2015-08-10 | 2015-12-02 | 安徽富煌钢构股份有限公司 | Method for welding dissimilar steel plate of 45 steel and ZG275-485 steel |
| CN108655546A (en) * | 2017-03-30 | 2018-10-16 | 南阳二机石油装备集团股份有限公司 | Dissimilar steel welding technology method |
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Application publication date: 20190503 |
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