CN107138841B - Microalloying improves dissimilar metal Mg-Fe point quality technique - Google Patents
Microalloying improves dissimilar metal Mg-Fe point quality technique Download PDFInfo
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- CN107138841B CN107138841B CN201710400310.6A CN201710400310A CN107138841B CN 107138841 B CN107138841 B CN 107138841B CN 201710400310 A CN201710400310 A CN 201710400310A CN 107138841 B CN107138841 B CN 107138841B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
- B23K11/20—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of different metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/34—Preliminary treatment
Abstract
The invention discloses a kind of microalloyings to improve dissimilar metal Mg-Fe point quality technique, Step 1: modulating alloy slurry group by raw material of Mn powder, Al powder and volatile solvent；Step 2: being scratched at the lap joint of Mg material and Fe material to be welded when alloy slurry group has suitable viscosity, pre-treatment is carried out to treat wlding material；Step 3: the lap joint to Mg material and Fe material carries out spot welding.It is using the remarkable result that microalloying of the invention improves dissimilar metal Mg-Fe point quality technique, increase the nugget size between point postwelding dissimilar metal Mg and Fe, nugget is set to be evenly distributed between Mg-Fe symmetrically, the anti-shear performance between a postwelding dissimilar metal Mg-Fe is significantly improved, to improve point quality between dissimilar metal Mg-Fe.
Description
Technical field
The present invention relates to a kind of spot welding methods, specifically, being a kind of technique for improving point quality between Mg-Fe.
Background technique
Metal biggish for some brittleness, is difficult to form solid solution in spot welding, thus welding quality is bad.Study people
Member has found in previous research, for the spot welding between homogenous metal Mg, by using tri- kinds of metal powders of Fe-Al-Zn, energy
Microalloying region is formed at the welding point of metal Mg, nugget rule is symmetrical, and nugget size becomes larger excellent to harvest
Effect；The anti-shearing force and corrosion resistance of welding point also dramatically increase, and point quality improves.
Meanwhile researcher reuses tri- kinds of metals of Fe, Al, Zn, it was also found that when to spot welding is carried out between dissimilar metal
Powder perhaps any one of them or wherein any two, cannot obtain effect identical with homogenous metal Mg.
Summary of the invention
In view of this, the present invention provides a kind of microalloying improvement dissimilar metal Mg-Fe point quality technique.
Technical solution is as follows:
A kind of microalloying improvement dissimilar metal Mg-Fe point quality technique, key are to sequentially include the following steps:
Step 1: modulation alloy slurry group
Mn powder and Al powder are weighed according to the mass ratio of 1~5:5~9, Mn powder and Al powder are mixed in proportion, addition is waved
Hair property solvent is modulated into alloy slurry group；
Step 2: material pre-treatment to be welded
Alloy slurry group is stirred, when its viscosity is 0.65~0.7Pas, alloy is starched into group's blade coating in Mg material to be welded
At the lap joint of Fe material, alloy slurry group layer is formed between Mg material and the connector of Fe material；
Step 3: spot welding
Spot welding is carried out to the lap joint of Mg material and Fe material.
Preferably, in the step 1, the volatile solvent is acetone.
Preferably, in the step 1, the mass ratio of Mn powder and Al powder is 3:7.
Preferably, in the step 2, the overall thickness of the alloy that scratches between the Mg material and Fe material slurry group layer is 30~
80μm。
Preferably, in the step 2, the surface of Mg material and Fe material at lap joint scratches alloy slurry group, Mg respectively
2 times of the thickness that group's layer is starched with a thickness of Fe material surface alloy of material surface alloy slurry group layer, Mg material surface alloy slurry group thickness degree
Starching the sum of group's thickness degree with Fe material surface alloy is 30~80 μm.
Preferably, the sum of Mg material surface alloy slurry group's thickness degree and Fe material surface alloy slurry group thickness degree are 48~52
μm。
Specific embodiment
A kind of microalloying improvement dissimilar metal Mg-Fe point quality technique, sequentially includes the following steps:
Step 1: modulation alloy slurry group
Mn powder and Al powder are weighed according to the mass ratio of 1~5:5~9, Mn powder and Al powder are mixed in proportion, addition is waved
Hair property solvent is modulated into alloy slurry group；The volatile solvent is acetone；
Step 2: material pre-treatment to be welded
Alloy slurry group is stirred, when its viscosity is 0.65~0.7Pas, alloy is starched into group's blade coating in Mg material to be welded
At the lap joint of Fe material, alloy slurry group layer is formed between Mg material and the connector of Fe material；
In the step 2, the surface of Mg material and Fe material at lap joint scratches alloy slurry group, Mg material surface respectively
2 times of the thickness that group's layer is starched with a thickness of Fe material surface alloy of alloy slurry group layer, Mg material surface alloy slurry group's thickness degree and Fe material
The sum of surface alloy slurry group thickness degree is 30~80 μm.
Step 3: spot welding
Spot welding is carried out to the lap joint of Mg material and Fe material.
Two, below with reference to test example, the present invention will be further described.
Group is starched by 1 alloyage of table
Mn, Al mass (unit: g) in table 1, alloy slurry group
It takes first, second, third and fourth, five group of alloy to starch group, is scratched respectively in Mg plate surface, blade coating area is 20mm*
The alloy slurry group thickness degree of 20mm, blade coating are respectively 30~35 μm, 48~52 μm, 60~65 μm, 75~80 μm and 48~52 μm,
Fe plate is fitted on Mg plate again, spot welding, respectively test group A, B, C, D, E are carried out to the lap joint at blade coating；
It takes first, second, third and fourth, five group of alloy to starch group, is scratched respectively in Fe plate surface, blade coating area is 20mm*
The alloy slurry group thickness degree of 20mm, blade coating are respectively 75~80 μm, 60~65 μm, 48~52 μm, 30~35 μm and 48~52 μm,
Mg plate is fitted on Fe plate again, spot welding, respectively test group a, b, c, d, e are carried out to the lap joint at blade coating；
It takes the 5th group of alloy to starch group, 30~35 μm of alloy slurry group layer is scratched on Mg plate, blade coating area is 20mm*
20mm scratches 15~17 μm of alloy slurry group layer on Fe plate, and blade coating area is 20mm*20mm, by the conjunction on Mg plate and Fe plate
The alignment fitting of gold paste group's layer, then spot welding is carried out, it is for test group G.
And following blank group is set: acetone being coated on the faying surface of Mg plate and Fe plate respectively, then carries out spot welding.
The welding condition of test group A, B, C, D, E, a, b, c, d, e, G are consistent；It is all made of YR-A05C blow-up fluid welding
Machine, welding current 20000A, weld interval 20cyc, squeeze time 45cyc, hold time 30cyc, and electrode is spherical radius
The standard Fe-Cr electrode of 15mm, electrode tip end face diameter φ 15mm, electrode pressure 0.1MPa.
After the completion of welding, the nugget of test group A, B, C, D, E, a, b, c, d, e, G and blank group are observed.As a result are as follows:
The nugget size of blank group is smaller, and serious unevenness is distributed between Mg plate and Fe plate；
The nugget size of test group A, B, C, D, E, a, b, c, d, e have different degrees of increase compared to blank group, but
It is distributed between Mg plate and Fe plate also more uneven；
The nugget size of test group G is further increased compared to the nugget size of test group A, B, C, D, E, a, b, c, d, e,
And be evenly distributed between Mg plate and Fe plate, with from the point of view of the welding binding face of Mg plate and Fe plate, nugget almost symmetrically state.
Thus, the Mg plate of test group G and the welding quality highest of Fe plate.
After the completion of welding, the maximum shear stress F of the Mg plate and Fe plate that weld together is measured0, maximum shear stress F0With Mg plate
Tensiometer when breaking disengaging from spot-welding part with Fe plate, the results are shown in Table 2:
The maximum shear stress F of table 2, different groups0(unit: KN)
As can be seen from Table 2, compared to blank group, the Mg plate and Fe plate of test group A, B, C, D, E, a, b, c, d, e are most
Big shearing force F0There are different degrees of raising, the Mg plate of test group G and the maximum shear stress F of Fe plate0Significantly larger than blank group,
And also improve a lot compared with test group A, B, C, D, E, a, b, c, d, e, illustrate the Mg plate of test group G and the welding quality of Fe plate
Highest.
By the above test example it is found that using the beneficial effects of the present invention are: increasing between point postwelding dissimilar metal Mg and Fe
Nugget size, so that nugget is evenly distributed between Mg-Fe symmetrically, significantly improve anti-between a postwelding dissimilar metal Mg-Fe
Cutting performance, to improve point quality between dissimilar metal Mg-Fe.
Finally, it should be noted that foregoing description is only the preferred embodiment of the present invention, the ordinary skill people of this field
Member under the inspiration of the present invention, without prejudice to the purpose of the present invention and the claims, can make multiple similar tables
Show, such transformation is fallen within the scope of protection of the present invention.
Claims (2)
1. a kind of microalloying improves dissimilar metal Mg-Fe point quality technique, it is characterised in that sequentially include the following steps:
Step 1: modulation alloy slurry group
Mn powder and Al powder are weighed according to the mass ratio of 1~5:5~9, Mn powder and Al powder are mixed in proportion, volatility is added
Solvent is modulated into alloy slurry group；
Step 2: material pre-treatment to be welded
Alloy slurry group is stirred, when its viscosity is 0.65~0.7Pas, alloy is starched into group's blade coating in Mg material to be welded and Fe
At the lap joint of material, alloy slurry group layer is formed between Mg material and the connector of Fe material；
Step 3: spot welding
Spot welding is carried out to the lap joint of Mg material and Fe material；
In the step 1, the volatile solvent is acetone；
In the step 1, the mass ratio of Mn powder and Al powder is 3:7；
In the step 2, the surface of Mg material and Fe material at lap joint scratches alloy slurry group, Mg material surface alloy respectively
2 times of the thickness that group's layer is starched with a thickness of Fe material surface alloy of slurry group layer, Mg material surface alloy slurry group's thickness degree and Fe material surface
The sum of alloy slurry group thickness degree is 30~80 μm.
2. microalloying according to claim 1 improves dissimilar metal Mg-Fe point quality technique, it is characterised in that: institute
Stating the sum of Mg material surface alloy slurry group's thickness degree and Fe material surface alloy slurry group thickness degree is 48~52 μm.
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| CN107138841B true CN107138841B (en) | 2019-07-02 |
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Citations (5)
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| CN101856774A (en) * | 2009-04-09 | 2010-10-13 | 通用汽车环球科技运作公司 | By metallurgical reaction welding light metal workpieces |
| CN101918168A (en) * | 2008-01-17 | 2010-12-15 | 日产自动车株式会社 | Method of bonding different metals and bonded structure |
| CN103111743A (en) * | 2013-02-28 | 2013-05-22 | 山东大学 | Rapid welding method for steel and aluminum or aluminum alloy |
| JP2014184472A (en) * | 2013-03-25 | 2014-10-02 | Nisshin Steel Co Ltd | Stainless steel plate molding jointed by resistance heat |
| CN106270879A (en) * | 2016-09-29 | 2017-01-04 | 哈尔滨工业大学（威海） | The magnesium of a kind of coating assistant regulating and controlling and steel foreign material laser welding-brazing method |
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2017
- 2017-05-31 CN CN201710400310.6A patent/CN107138841B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101918168A (en) * | 2008-01-17 | 2010-12-15 | 日产自动车株式会社 | Method of bonding different metals and bonded structure |
| CN101856774A (en) * | 2009-04-09 | 2010-10-13 | 通用汽车环球科技运作公司 | By metallurgical reaction welding light metal workpieces |
| CN103111743A (en) * | 2013-02-28 | 2013-05-22 | 山东大学 | Rapid welding method for steel and aluminum or aluminum alloy |
| JP2014184472A (en) * | 2013-03-25 | 2014-10-02 | Nisshin Steel Co Ltd | Stainless steel plate molding jointed by resistance heat |
| CN106270879A (en) * | 2016-09-29 | 2017-01-04 | 哈尔滨工业大学（威海） | The magnesium of a kind of coating assistant regulating and controlling and steel foreign material laser welding-brazing method |
Non-Patent Citations (1)
| Title |
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| "微合金化对AZ31B镁合金点焊接头组织和耐蚀性能的影响研究";王刚 等;《热加工工艺》;20170410;第46卷(第7期);第68-71页 |
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