Summary: Regard what supersonic technology applies the electric arc of heat source and supersonic emission source at microtherm steel as to solder electric arc at the same time process, choose 16MnDR and 09MnNiDR to undertake electric arc supersonic solder experiment, the metallographic that analyses welding line area through contrast is organized and solder the concussion tenacity of contact, the SEM that combines concussion fracture surface is analysed, proof electric arc exceeds sound energy to refine welding line to raise microtherm steel organization, effectively to solder quite the concussion tenacity of contact. Key word: Electric arc is supersonic solder grain refines Normal >normal > low temperature solders the structure applies extensively at the industry such as oil, chemical industry, rise solder the microtherm tenacity of contact is it is microtherm steel solders all the time the heat of research [1] . Use adscititious ultrasonic field, promote solder the motion of metal of the liquid state in the process, control process of welding line crystallization, it is to make high-powered solder important way of the structure, and at present lack guides supersonic necessary step and technology [2] . Wu Min gave birth to a professor to put forward the electric arc that with soldering electric arc load regards supersonic catapult as compose supersonic technology, carry electric arc and work from coupling will supersonic add solder bath, in order to refine organization of welding line crystallization, improve the performance of material. The article solders what supersonic technology applies electric arc at 16MnDR, 09MnNiDR in the process, experimental result makes clear, the refined welding line region grain with supersonic and effective electric arc, rose to solder the concussion tenacity of contact. 1, electric arc is supersonic solder experimental system Normal > arc solder, electric arc is OK and equivalent the block sex that is trends is laden, solder in convention electric arc two end bring to bear on signal of high frequency report, make free electric arc or plasma electric arc get high frequency modulation, arouse an electric arc thereby supersonic, make regard treatment as the electric arc of heat source, become a kind of supersonic emission source that can control at the same time. The analysis of feature of supersonic to electric arc signal makes clear, regard supersonic catapult as compose with electric arc load, have wide chart frequency to answer character, and the parameter such as frequency can accuse in real time [3] . Graph 1 electric arc is supersonic solder the electric arc that laboratory of experimental principle graph uses is supersonic solder experimental system is shown 1 times like the graph. Incentive power source uses technology of inversion of switch of electron of high frequency power, (this research gets project of national science foundation 50375080 aid financially) the successive and incentive signal that thises in order to output frequency to 500 kilohertz from frequency. Incentive source passes shunt-wound coupling means and join of photograph of groovy direct current source, will high frequency telegraphic date overlay arrives in electric arc loop, make electric arc plasma gets high frequency modulation and generation is supersonic and oscillatory. Use sound of tall sensitivity broadband to launch probe to be able to receive transmit that travels via mother capable person, use microphone to receive transmit that travels from inside air at the same time. Normal Align=center>(a) free electric arc blasts off (sound of electric arc of B) pulse modulation launchs Normal Align=center> pursues transmit that graph 2(a) place shows emissive weaveform of 2 free electric arc and sound of modulation electric arc to did not get drive for TIG electric arc, its high frequency part is little, and ultrasonic frequency paragraph transmit that did not discover the law. Graph 2(b) is the supersonic signal that the place of modulation electric arc that the microphone that is apart from place of electric arc 60mm receives arouses. Of lower part is incentive pulse weaveform, upper part is the signal that microphone accepts in air, the modulation that sees pair of electric arc can inspire sound wave of favorable balance of trade successfully. Supersonic signal lag at modulation pulse because existence is apart from certainly between microphone and electric arc,be. 2, experimental result reachs discussion Normal > supersonic electric arc and solder material and solder the method has nothing to do, get only the influence with character of adscititious and incentive source and electric arc high frequency and characteristic plasma. The electric arc that early days is aimed at carbolic steel is supersonic solder the experiment makes clear, electric arc is supersonic organize to refining welding line, improvement solders the mechanical function of contact has more apparent effect. [4] Normal > choice low temperature is experimental object, undertake electric arc supersonic solder experiment, research electric arc is supersonic solder to microtherm steel the influence of contact organization function. Solder experimental parameter is: Welding wire is H08MnAf4, HJ431 welding flux, solder of bosseyed sheet path, board thick 12mm, solder 600A of × of craft parameter 30V, incentive electric current makes an appointment with 20A. Normal Align=center>(a) did not add electric arc supersonic (B) joins electric arc supersonic Normal Align=center> pursues the metallographic of area of 3 16MnDR welding line organizes a scheme 3 solder for 16MnDR the metallographic organization of area of contact welding line. In electric arc supersonic action falls, welding line is columnar the configuration of brilliant produced constant change. When convention solders, columnar brilliant grain is bulky and inhomogenous; In electric arc supersonic action falls, column brilliant grain is refined apparently, and be in lengthen along the grain on supersonic and oscillatory direction. Did not add supersonic when, a bulky shape first eutectoid ferrite the crystal boundary separate out along austenite, the ferrite that lump distributings and pearlite are inside brilliant. In electric arc supersonic action falls, first the layer of eutectoid ferrite piece attenuate, and appeared more acicular ferrite. Farther observation makes clear, supersonic action issues electric arc, solder the welding line area of contact and the organization that heat up influence area all got different rate refine. By welding line grain refine and more acicular the occurrence of ferrite can foreknow, solder the concussion tenacity that electric arc introduces to exceed sound energy to raise microtherm steel quite in the process. Normal > basis national level GB/T229-1994, use V of standard summer family name breach to undertake pounding an experiment, sample norms is 10mm of × of 55mm × 10mm. Express the 1 16MnDR that falls for different modulation frequency to solder the concussion tenacity of contact. In the electric arc of certain and incentive parameter supersonic action falls, the welding line area of 16MnDR and hot influence area are in - the concussion tenacity below 40 ℃ all has 50% range rise, but the disperse sex with data larger presence. Pound the influence of tenacity to microtherm steel welding line to prove electric arc is supersonic further, choice 09MnNiDR steel undertakes electric arc supersonic solder the experiment is in - 70 ℃ undertook pounding an experiment, if express,as a result 2 are shown. Experimental parameter is: Try board 12mm of × of 300mm of dimension 100mm × , welding wire is H08MnAf4, HJ431 welding flux, bosseyed V groove is double-faced solder, 500A of openly 33V × , 550A of rear 35V × , incentive electric current makes an appointment with 15A. Normal Align=center> expresses frequency of 1 different modulation to fall solders the concussion tenacity Normal Align=center> incentive frequency (KHz) Normal Align=center> does not have supersonic and incentive Normal Align=center>30 Normal Align=center>50 Normal Align=center>80 Normal TEXT-ALIGN of area of Center" Align=center> welding line: Center" Align=center> pounds tenacity Normal Align=center>(J/cm2) Normal Align=center>9 12 12 Normal Align=center>(11) Normal Align=center>0 Normal Align=center>16 12 9 Normal Align=center>(12. 3) Normal Align=center>11.
8% Normal Align=center>16 18 14 Normal Align=center>(16) Normal Align=center>45.
5% Normal Align=center>8 8 5 Normal Align=center>(7) Normal Align=center>-36.
4% Normal Align=center> heat affects area Normal Align=center> pounds tenacity Normal Align=center>(J/cm2) Normal Align=center>18 28 ()* Normal Align=center>(23) Normal Align=center>0 Normal Align=center>30 36 ()* Normal Align=center>(33) Normal Align=center>43.
5% Normal Align=center>43 29 32 Normal Align=center>(34.
7) Normal Align=center>50.
9% Normal Align=center>15 11 42 Normal Align=center>(22.
7) Normal Align=center>-1.
3% Normal >* sample has crackle drawback, did not pound (A) did not add electric arc supersonic (B) joins electric arc to exceed sound spectrogram 4 09MnNiDR to solder graph of lens of report of scanning of contact concussion fracture surface pursues 4 solder for 09MnNiDR the photograph of scanning report lens of contact concussion fracture surface, did not join supersonic fracture surface formerly to show the cleavage grain of fluvial shape, rupture for typical brittleness, join the fracture surface after electric arc is supersonic to appear nest of a certain quantity of pliable but strong, have the feature that apparent tenacity ruptures. Explain sample produced bigger plasticity to be out of shape before rupture, consequently the concussion tenacity of contact be able to relatively substantially rise (refer to watch 2) . Soldering actually in the process, main body checks the effect with supersonic electric arc now of the fuse-element of solid fluid interface and flow disturb, express qualitative intention namely [5] . Supersonic soldering the finite amplitude attenuation in bath makes certain sound is formed to press gradient inside fuse-element, the in season that forms a fluid thereby flows. This gush flows in whole fluid to cause annulus of a whole to flow, influence solute distributings mediumly in bath. In the meantime, be in the metallic fuse-element below high temperature condition, because the grain intensity on solid fluid interface is very low, move action to be in all round its on the liquid when faze, can destroy the crystal that growing, make the quality in bath and quantity of heat distributing afresh. Different and incentive parameter (incentive electric current, incentive frequency) electric arc is supersonic steel of influence low temperature solders the specific law of contact organization function still needs further research. Normal Align=center> expresses frequency of 2 different modulation to fall solders the concussion tenacity Normal Align=center> incentive frequency (KHz) Normal Align=center> does not have supersonic and incentive Normal Align=center>30 Normal Align=center>50 Normal Align=center>80 Normal Align=center>100 Normal TEXT-ALIGN of area of Center" Align=center> welding line: Center" Align=center> pounds tenacity Normal Align=center>(J/cm2) Normal Align=center>26 25 24 Normal Align=center>(25) Normal Align=center>0 Normal Align=center>26 37 25 Normal Align=center>(29.
3) Normal Align=center>17.
3% Normal Align=center>33 37 40 Normal Align=center>(36.
7) Normal Align=center>46.
7% Normal Align=center>35 30 33 Normal Align=center>(32.
7) Normal Align=center>30.
7% Normal Align=center>36 32 34 Normal Align=center>(34) Normal Align=center>36% Normal Align=center> heat affects area Normal Align=center> pounds tenacity Normal Align=center>(J/cm2) Normal Align=center>22 25 33 Normal Align=center>(26.
7) Normal Align=center>0 Normal Align=center>31 32 16 Normal Align=center>(26) Normal Align=center>-2.
6% Normal Align=center>48 66 32 Normal Align=center>(48.
7) Normal Align=center>82.
3% Normal Align=center>19 61 237* Normal Align=center>(33) Normal Align=center>23.
6% Normal Align=center>68 21 30 Normal Align=center>(39.
7) Normal Align=center>48.
6% 3. Conclusion Normal >normal > passes 16MnDR and 09MnNiDR is supersonic solder experiment, proof electric arc is supersonic and OK solder to microtherm steel the organization of contact and function generation influence: Normal >1, supersonic drive in different frequency, the imperceptible organization of welding line area produces change, more acicular the concussion tenacity that the occurrence of ferrite increased welding line. Normal >2, electric arc be helpful for raising what area of microtherm steel welding line and hot influence area pound tenacity. CNC Milling