A kind of method for resistance welding
Technical field
The present invention relates to enclosed refrigeration compressor field, particularly relate to swirl type cold compressor, compressor case component with have air-breathing, a kind of welding method of welding is carried out in exhaust, all pipe of oil or other purposes.
Background technology
At present, swirl type cold compressor casing component, with have air-breathing, exhaust, all welding manner of the pipe of oil or other purposes have soldering, electric welding, electric resistance welding etc.
Soldering and electric welding, as normal welding mode, have its weak point:
1, need additionally to use the consumptive material such as solder, welding slag preventing agent, production cost is high;
2, stability of the welding quality is poor, and in welding process, easily occur the weld defects such as pore, oxidation, slag inclusion, these defects directly results in the generation of leakage.Particularly brazing mode, although there will not be leakage by quality control method in compressor production process, but when carrying out pipe arrangement weld job in the compressor user hands such as air-conditioning manufacturer, because adopt brazing mode equally, so the original brazing solder fusing of compressor can be made when welding gun flame is long or temperature is too high and then leak;
3, the single work piece production time is long, beat is slow, efficiency is low.
4, whole operating process can produce more smog and dust, and operating environment is poor.
The ready-made case that electric resistance welding mode is applied in enclosed refrigeration compressor field is generally plane and welds with the conical surface with plane-welding or plane.But no matter adopt any form to weld, all first must go out a plane in a certain region of shell, then go out manhole in the plane, shell processing technology is complicated, and therefore processing cost is high.
Summary of the invention
The present invention is directed to the proposition of above problem, and a kind of method for resistance welding of research and design.The technological means that the present invention adopts is as follows:
A kind of method for resistance welding, comprises following processing step:
A () obtains the concentric column thin wall with through hole;
B () obtains the pipe with shape of a saddle end, shape of a saddle end comprises shape of a saddle bulge loop face and shape of a saddle bottom surface;
C () obtains first electrode with endoporus and saddle camber;
D () obtains second electrode with saddle camber;
E () arranges pipe to make its shape of a saddle bottom surface contact with the saddle camber of the second electrode and to fit completely;
F () arranges shell and is inserted in pipe to make its through hole, make the convex annular face contacts of the shape of a saddle of the inner surface of shell and pipe and fit completely;
G () arranges the first electrode and is inserted in pipe to make its endoporus, make the exterior surface of its saddle camber and shell and fit completely;
H () applies certain precompression to described first electrode, shell, pipe and the second electrode, then pass to electric current to make shell-and-tube contact area generation weld nugget.
It is the concentric pipe with shape of a saddle end as preferred pipe; Pipe is the steel pipe with shape of a saddle end formed by deep stretching process, stamps out the bulge loop part equidistant with shape of a saddle end in shape of a saddle end on pipe draw direction, and the curved surface at place, bulge loop upper end is shape of a saddle bulge loop face; Pipe stretching rightabout then forms the annular groove equidistant with shape of a saddle end, and the curved surface at bottom portion of groove place is shape of a saddle bottom surface.
Center line projection of shape in the plane perpendicular to tubular axis line as the shape of a saddle bulge loop face of preferred pipe is circle, oval, rectangle.
As the shape of a saddle end of preferred pipe by by the plane cutting of tubular axis line, obtaining boss cross sectional shape respectively be semicircle, rectangle, trapezoidal, triangle, arc, and acquisition channel section shape is semicircle, rectangle, trapezoidal, triangle, arc.
A kind of concentric column thin wall by roll bending, welding and turnery processing as preferred shell, or another kind of by carrying out the concentric column thin wall of turnery processing to seamless steel pipe; Through hole is the circular hole processed by the method such as punching or boring in the side of shell.
As the axis of the through hole of preferred shell and the intersect vertical axis of shell.
As preferably in process step (e), the radius of curvature of the shape of a saddle bottom surface of pipe is equal with the radius of curvature of the saddle camber of the second electrode; In step (f), the radius of curvature of the inner surface of shell is equal with the radius of curvature in the shape of a saddle bulge loop face of pipe; In step (g), the radius of curvature of the saddle camber of the first electrode is equal with the radius of curvature of the outer surface of shell.
As the axis co-axial of the axis of the axis of preferred pipe, the through hole of shell, the axis of the first electrode and the second electrode.
As preferably in step (h), weld nugget is annular weld zone.
Material as preferably pipe and shell is the steel of steel, copper plated steel or other material of coating.
Compared with the prior art, a kind of method for resistance welding of the present invention has the following advantages:
1, welding method of the present invention is compared with the normal welding such as electric welding, soldering mode, uses electric resistance welding, does not need the consumptive materials such as solder, saved material cost;
2, welding method of the present invention is compared with the normal welding such as electric welding, soldering mode, use electric resistance welding, nugget formed time all the time surround by plastic area and and air exclusion, not easily produce the weld defects such as pore, slag inclusion, oxidation, greatly reduce the possibility occurring to leak, welding quality stable;
3, welding method of the present invention is compared with the normal welding such as electric welding, soldering mode, and use electric resistance welding, single workpiece is short for weld interval, improves production efficiency;
4, welding method of the present invention is compared with the normal welding such as electric welding, soldering mode, and use electric resistance welding, whole operating process can produce few smog and dust, improves operating environment;
5, compared with welding method of the present invention and plane and plane or plane are welded with the conventional resistive of the conical surface, do not need, at shell upper punch out-of-plane, to simplify shell processing technology, saved processing cost.
A kind of method for resistance welding of the present invention, the form adopting a kind of saddle-shaped surface and Cylinder Surface to fit completely, is combined into component by electric resistance welding, designs ingenious, simple to operate, can avoid the deficiency that the normal welding such as soldering and electric welding mode causes.
Accompanying drawing explanation
Fig. 1 is along the cut-away illustration on shell axis direction at the fore shell positioning welding, pipe, the first and second electrodes;
Fig. 2 is in the fore shell positioning welding, pipe, the cut-away illustration of the first and second electrode vertical on shell axis direction;
Fig. 3 is when welding, and shell, pipe, the first and second electrodes are along the cut-away illustration on shell axis direction;
Fig. 4 is when welding, shell, pipe, the cut-away illustration of the first and second electrode vertical on shell axis direction;
Wherein:
10, shell, 12, through hole;
20, manage, 21, shape of a saddle end, 22, bulge loop face, shape of a saddle end, 23, shape of a saddle bottom surface;
30, the first electrode, the 31, first electrode endoporus, the 32, first electrode saddle camber;
40, the second electrode, the 41, second electrode saddle camber;
50, nugget anchor ring.
Detailed description of the invention
As Figure 1-Figure 4, a kind of method for resistance welding, comprises following processing step:
A () obtains the concentric column thin wall 10 with through hole 12;
B () obtains the pipe 20 with shape of a saddle end 21, shape of a saddle end 21 comprises shape of a saddle bulge loop face 22 and shape of a saddle bottom surface 23;
C () obtains first electrode 30 with endoporus 31 and saddle camber 32;
D () obtains second electrode 40 with saddle camber 41;
E () arranges pipe 20 and contacts to make its shape of a saddle bottom surface 23 with the saddle camber 41 of the second electrode 40 and fit completely;
F () arranges shell 10 and is inserted in pipe 20 to make its through hole 12, make the inner surface of shell 10 contact with the shape of a saddle bulge loop face 22 of pipe 20 and fit completely;
G () arranges the first electrode 30 and is inserted in pipe 20 to make its endoporus 31, make the exterior surface of its saddle camber 32 and shell 10 and fit completely;
H () applies certain precompression to described first electrode 30, shell 10, pipe 20 and the second electrode 40, then pass to electric current to make shell 10 and pipe 20 contact area generation weld nugget 50.
Welded by electric resistance welding, do not need the consumptive materials such as solder, saved material cost.
Described pipe 20 is the concentric pipes with shape of a saddle end 21; Pipe 20 is the steel pipes with shape of a saddle end 21 formed by deep stretching process, stamps out the bulge loop part equidistant with shape of a saddle end 21 in shape of a saddle end 21 on pipe 20 draw direction, and the curved surface at place, bulge loop upper end is shape of a saddle bulge loop face 22; On pipe 20 stretches rightabout, then form the annular groove equidistant with shape of a saddle end 21, the curved surface at bottom portion of groove place is shape of a saddle bottom surface 23.
Center line projection of shape in the plane perpendicular to pipe 20 axis in the shape of a saddle bulge loop face 22 of described pipe 20 is circle, oval, rectangle.
The shape of a saddle end 21 of described pipe 20 is by the plane cutting by pipe 20 axis, and obtaining boss cross sectional shape respectively be semicircle, rectangle, trapezoidal, triangle, arc, and acquisition channel section shape is semicircle, rectangle, trapezoidal, triangle, arc.
Described shell 10 is a kind of concentric column thin walls 10 by roll bending, welding and turnery processing, or another kind of by carrying out the concentric column thin wall 10 of turnery processing to seamless steel pipe; Through hole 12 is the circular holes processed by the method such as punching or boring in the side of shell 10.
The axis of the through hole 12 of described shell 10 and the intersect vertical axis of shell 10, make welding locate more accurate.
In process step (e) described, the radius of curvature of the shape of a saddle bottom surface 23 of pipe 20 is equal with the radius of curvature of the saddle camber 41 of the second electrode 40; In step (f), the radius of curvature of the inner surface of shell 10 is equal with the radius of curvature in the shape of a saddle bulge loop face 22 of pipe 20; In step (g), the radius of curvature of the saddle camber 32 of the first electrode 30 is equal with the radius of curvature of the outer surface of shell 10, welding is located more accurate, saddle-shaped surface and Cylinder Surface is reached and fits completely, advantageously in the welding of electric resistance welding.
The axis co-axial of the axis of the axis of described pipe 20, the through hole 12 of shell 10, the axis of the first electrode 30 and the second electrode 40, makes welding locate more accurate.
In step (h) described, weld nugget 50 is annular weld zone, uses electric resistance welding, nugget formed time all the time surround by plastic area and and air exclusion, not easily produce the weld defects such as pore, slag inclusion, oxidation, greatly reduce the possibility occurring to leak, welding quality stable.
The material of described pipe 20 and shell 10 is the steel of steel, copper plated steel or other material of coating.
A kind of method for resistance welding of the present invention, adopt the form that a kind of saddle-shaped surface and Cylinder Surface are fitted completely, compared with plane and plane or plane are welded with the conventional resistive of the conical surface, do not need at shell upper punch out-of-plane, simplify shell processing technology, save processing cost; Be combined into component by electric resistance welding, design ingenious, simple to operate, the deficiency that the normal welding such as soldering and electric welding mode causes can be avoided; Single workpiece is short for weld interval, improves production efficiency; Whole operating process can produce few smog and dust, improves operating environment.
The above; be only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.