CN103949764B - A kind of welding method of freeze dryer flaggy parting bead - Google Patents
A kind of welding method of freeze dryer flaggy parting bead Download PDFInfo
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- CN103949764B CN103949764B CN201410165260.4A CN201410165260A CN103949764B CN 103949764 B CN103949764 B CN 103949764B CN 201410165260 A CN201410165260 A CN 201410165260A CN 103949764 B CN103949764 B CN 103949764B
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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
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- B23K10/02—Plasma welding
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Abstract
A welding method for freeze dryer flaggy parting bead, belongs to welding technology field.Its technical scheme is: it comprises the top panel and lower panel that be arranged in parallel, some parting beads are fixed in the spot welding of lower panel upper surface, top panel is placed on the another side of parting bead, fix top panel and lower panel by longitudinal moulding spot welding, use plasma arc soldering method carries out top panel, lower panel is fixedly connected with parting bead.The present invention adopts the method for automatic plasma arc-welding, the welding procedure with flaggy is simple, welding efficiency is high, layer structure intensity is high, anti-pressure ability is strong, welding deformation is little, fatigue resistance performance is good, the unrestricted remarkable advantage of size that is flaggy, significantly reduce the probability of maintenance, welding for freeze dryer flaggy parting bead is a kind of innovation, solve a difficult problem for the welding method not having desirable freeze dryer flaggy parting bead for a long time, can greatly boost productivity and meet the requirement of different product type, there is significant economic benefit.
Description
Technical field
The present invention relates to a kind of welding method of freeze dryer flaggy parting bead, belong to welding technology field.
Background technology
The internal structure of layer is hollow, and central filler has heat-conducting medium.In order to ensure heat-conducting medium can in flaggy Uniform Flow, inside is provided with parting bead and forms " snakelike road ", at present mainly adopts five kinds of techniques to carry out welding of freeze dryer flaggy and parting bead.
One is " plugging technique ", and this method is first welded on one panel by parting bead, and then in the position boring plug welding of the corresponding parting bead of another panel, the weld seam exceeded is polished and polishing.Although this technology is processed simple but had some shortcomings, except welding deformation is large, if use manual welding, efficiency is low; If use manipulator welding, when welding process, due to flaggy distortion, cause teaching and actual path deviation, easily occur weld defect.And each flaggy needs a panel and punches in advance, increase the weld preparation time.
Two is " thumb locks ", and parting bead is designed l-shaped snap close form and is welded on respectively on two pieces of panels by this method, is interlocked by two parting beads.In such an embodiment, because the snap close between parting bead with parting bead cannot weld, in order to enable L-type snap close stable interlock, the planarity requirements of counter plate and parting bead is high, considerably increases difficulty of processing.
Three is " high temperature vacuum brazing methods ", namely, between flaggy top panel and parting bead, enclose brazing material between parting bead and lower panel, put into high temperature vacuum brazing stove after overall clamping and be heated to specific temperature and brazing layer melted flaggy top panel and parting bead and parting bead and lower panel are linked together." high temperature vacuum brazing " overcomes the shortcoming of " plugging technique " and " thumb lock ", but there is very big-difference due to solder and stainless physical property, and the alternately change repeatedly between-40 DEG C to 120 DEG C of the temperature of flaggy, so fatigue strength is very limited.And apparatus expensive, drop into high, the size of flaggy also can be subject to the restriction of soldering oven in addition.
Four is " energy storage resistance welding methods ", lie in a horizontal plane on energy storage electric resistance welding lower electrode plate by top panel, use energy storage electric resistance welding to organize support column in the welding of top panel upper surface side by side parallel more, on the relative two sides of parting bead, interval one side offers fabrication hole, punching press salient point is outwards gone out on side at fabrication hole, being contained in by parting bead parallel sleeve by fabrication hole often organizes on support column, uses energy storage electric resistance welding upper and lower panel and parting bead to be welded together respectively.Need preset salient point and processing technology hole before using the method weldering, preparatory process is many, and assembly precision requires high, and post welding distortion is large.
Five is " laser weld " technology, and this technology exists that equipment disposablely has high input, assembly precision requirement is high, operating technology requires the shortcomings such as high, equipment later maintenance cost is high.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of welding method of freeze dryer flaggy parting bead, this welding method has that welds prepares work is few, post welding distortion is little, efficiency is high, withstand voltage height, save material and the high advantage of properties of product stability, effectively can improve intensity and the voltage endurance capability of flaggy, and welding method is not by the restriction of flaggy size.
The technical scheme solved the problems of the technologies described above is:
Some parting beads of parallel distribution are placed between top panel and lower panel, are welded, take following steps in welding by the method for plasma arc welding (PAW) by a welding method for freeze dryer flaggy parting bead:
(1) flaggy and parting bead surface are cleared up, wipe oil, dust;
(2) parting bead spot welding is fixed on the upper surface of lower panel, top panel is placed on the another side of parting bead, make top panel and lower panel parallel alignment, longitudinal moulding and top panel, lower panel spot welding are fixed together;
(3) weld jig is used to clamp described top panel and lower panel, automatic plasma welding method is adopted to weld flaggy parting bead, weld seam between first welds upper plate and parting bead, then welds the weld seam between lower panel and parting bead, and the parameter of automatic plasma welding is:
Welding current 50 ~ 300A, ion-gas flow 0.1 ~ 10L/min, shielding gas flow amount 1 ~ 50L/min; wire feed rate 50 ~ 2000mm/min, gage of wire 0.8 ~ 1.6mm, tungsten electrode diameter 2.4 ~ 6.4mm; nozzle bore 2 ~ 5mm, welding gun height 3 ~ 15mm, polarity is straight polarity direct current.
The welding method of above-mentioned freeze dryer flaggy parting bead, in automatic plasma arc-welding step, first welding is positioned at the weld seam of the parting bead of top panel center, then welding is positioned at the weld seam of the parting bead of top panel two boundary, finally by the weld seam of border welds upper plate and parting bead gradually to center.
The welding method of above-mentioned freeze dryer flaggy parting bead, after completing the welding of top panel and parting bead, flaggy and fixture integrated overturn 180 ° thereof, carry out welding of lower panel and parting bead, first welding is positioned at the weld seam of the parting bead of lower panel center, welding is positioned at the weld seam of the parting bead of lower panel two boundary again, is finally welded the weld seam of lower panel and parting bead gradually to center by border.
The welding method of above-mentioned freeze dryer flaggy parting bead, is provided with the starting the arc, climbing, cone change, declines and receive arc SECO in described automatic plasma welding method, automatic plasma welding time sequence parameter scope is:
Striking current 50 ~ 300A, arcing time 0 ~ 25.0s; Electric current climbing time 0 ~ 50.0s, welding current 50 ~ 300A; Electric current cone change time 0 ~ 50.0s, cone becomes section electric current 50 ~ 250A, and cone becomes section time 0 ~ 25s; Electric current down slope time 0 ~ 50.0s, receives arc current 40 ~ 150A, receives arc time 0 ~ 25s; Wire feed time delay 0 ~ 5.0s, starting the arc wire feed rate 0 ~ 2000mm/min, starting the arc wire feed time 0 ~ 75.0s, solder wire convey speed 0 ~ 2000mm/min, cone becomes wire feed rate 0 ~ 2000mm/min, cone becomes wire feed time 0 ~ 75.0s, receives arc wire feed rate 0 ~ 2000mm/min, receives arc wire feed time 0 ~ 75s; Spinning speeds 0 ~ 1000mm/min, reel off raw silk from cocoons time 0 ~ 5.0s; Walking time delay 0 ~ 25s, speed of welding 50 ~ 1000mm/min; Starting the arc ion-gas flow 0.1 ~ 10L/min; starting the arc ion-gas time 0 ~ 25.0s; ion-gas climbing time 0 ~ 50.0s, welding ion-gas flow 0.1 ~ 10L/min, ion gas coning becomes time 0 ~ 50.0s; cone becomes section ion-gas flow 0.1 ~ 10L/min; cone becomes section ion-gas time 0 ~ 50.0s, ion-gas down slope time 0 ~ 50.0s, receives arc ion-gas flow 0.1 ~ 10L/min; receive arc ion-gas time 0 ~ 25.0s, shielding gas flow amount 0 ~ 50L/min.
The welding method of above-mentioned freeze dryer flaggy parting bead, described parting bead and top panel, lower panel all adopt intermittent weld to be connected.
The welding method of above-mentioned freeze dryer flaggy parting bead, described parting bead is made up of square tube or square steel or i shaped steel.
Usefulness of the present invention is:
Present invention employs new automatic plasma welding method, this method is for the welding method of existing flaggy and parting bead, the welding procedure with flaggy is simple, welding efficiency is high, layer structure intensity is high, anti-pressure ability is strong, welding deformation is little, fatigue resistance performance is good, the unrestricted remarkable advantage of size of flaggy, make the use of freeze dryer more reliable and more stable, and significantly reduce the probability of maintenance, welding for freeze dryer flaggy parting bead is a kind of innovation, solve a difficult problem for the welding method not having desirable freeze dryer flaggy parting bead for a long time, can greatly boost productivity and meet the requirement of different product type, there is significant economic benefit.
Accompanying drawing explanation
Fig. 1 is a kind of freeze dryer layer structure figure for the welding of plasma arc soldering method of the present invention;
Fig. 2 be in Fig. 1 A-A to the first situation of cross section amplification view;
Fig. 3 be in Fig. 1 A-A to the second situation of cross section amplification view;
Fig. 4 be in Fig. 1 A-A to the third situation of cross section amplification view;
Fig. 5 is welding SECO figure.
In figure, mark is as follows: the plasma weld seam 6 that the plasma weld seam 4 that longitudinal moulding 1, horizontal moulding 2, top panel 3, top panel and parting bead are formed, parting bead 5, lower panel and parting bead are formed, lower panel 7.
Detailed description of the invention
A kind of welding method of freeze dryer flaggy parting bead, comprise the top panel 3 and lower panel 7 that be arranged in parallel, wherein some parting beads 5 are fixed in the spot welding of lower panel 7 upper surface, top panel 3 is placed on the another side of parting bead 5, top panel 3 and lower panel 7 is fixed by the spot welding of longitudinal moulding 1, use plasma arc soldering method carries out top panel 3, lower panel 7 is fixedly connected with parting bead 5, and as shown in Figure 1, section of weld joint schematic diagram as shown in Figure 2 for the weld seam schematic diagram of formation.
The welding method of above-mentioned freeze dryer flaggy parting bead, comprises the following steps:
(1) flaggy and parting bead 5 surface are cleared up, wipe oil, dust.
(2) fix some parting beads 5 in the spot welding of described lower panel 7 upper surface, top panel 3 is placed on parting bead 5 another side relative with lower panel 7, make top panel 3 and lower panel 7 parallel alignment.
(3) use weld jig to clamp described top panel 3 and lower panel 7, first welds upper plate 3, then weld lower panel 7.In the welding method of above-mentioned flaggy, first welding is positioned at the weld seam of described top panel 3 center and parting bead 5, then welding is positioned at the weld seam of top panel 3 border and parting bead 5, finally by the weld seam of border welds upper plate 3 and parting bead 5 gradually to center.Complete above 3 with after the welding of parting bead 5, layer structure and weld jig integrated overturn 180 °, carry out welding of lower panel 7 and parting bead 5, first welding is positioned at the weld seam of described lower panel 7 center and parting bead 5, welding is positioned at the weld seam of lower panel 7 border and parting bead 5 again, is finally welded the weld seam of lower panel 7 and parting bead 5 gradually to center by border.Weld seam adopts plasma arc discontinuous welding.
The size of above discontinuous welding fusion length, weld seam quantity and layer structure, to bear pressure relevant, adopts following formula to calculate:
Fusion length computing formula is l1 >=n × P × a × b/(m1 × w × σ b), weld spacing computing formula l2=(l3-l1 × (m1/m2))/(m1/m2+1); Wherein, every section of fusion length is l1, and the pressure that flaggy bears is P, flaggy length a, and width is b, σ b is metal anti-stretching intensity, and n is safety coefficient, and weld seam mean breadth is w, and weld seam number is m1, and parting bead number is m2, and weld spacing is l2, and parting bead length is l3.
Embodiments of the invention are as follows:
Embodiment 1
Top panel 3, lower panel 7 all adopt thickness to be the S31603 austenitic stainless steel of 5mm, and parting bead 5 adopts specification to be the S30408 austenitic stainless steel square tube of 12.7mm × 12.7mm × 1.5mm.
Voltage-withstand test requires that P is 1Mpa, tensile strength sigma b-S31603 >=the 480MPa of S31603, tensile strength sigma b-S30408 >=the 520MPa of S30408, σ b gets min{ σ b-S31603, σ b-S30408}=min{480,520}=480Mpa, safety coefficient n gets 1.5, flaggy length a gets 1200mm, width b gets 900mm, if plasma weld seam minimum widith w is 2mm, flaggy inconel weld number m1 gets 108, above-mentioned parameter is substituted into formula l1 >=n × P × a × b/(m1 × w × σ b), show that every bar fusion length is l1 >=15.625mm.15.625mm is reached in order to ensure back of weld penetration length; In actual mechanical process, welding gun walking length gets l1=25mm; If when between moulding and panel, average layout parting bead number m2 gets 9, parting bead length l3 is 1100mm, and fusion length is l1=25, then weld pitch is l2=(1100-25 × (108/9)/(108/9+1)=62mm.
Adopt SECO shown in Fig. 5, described automatic plasma welding time sequence parameter is: striking current 100A, arcing time 1.5s, electric current climbing time 2.0s, welding current 225A, electric current cone change time 2.0s, cone becomes section electric current 120A, and cone becomes section time 5.0s, electric current down slope time 2.0s, receive arc current 100A, receive arc time 3.0s; Wire feed time delay 0.5s, starting the arc wire feed rate 200mm/min, starting the arc wire feed time 3.0s, solder wire convey speed 300mm/min, cone becomes wire feed rate 500mm/min, and cone becomes wire feed time 7.0s, receive arc wire feed rate 300mm/min, receive arc wire feed time 3.0s, spinning speeds 300mm/min, reel off raw silk from cocoons time 2s; Walking time delay 2.0s, speed of welding 210mm/min; Starting the arc ion-gas flow 1.0L/min, starting the arc ion-gas time 1.5s, ion-gas climbing time 2.0s, welding ion-gas flow 1.5L/min, ion gas coning becomes time 2.0s, cone becomes section ion-gas flow 1.0L/min, cone becomes section ion-gas time 5.0s, ion-gas down slope time 2.0s, receives arc ion-gas flow 0.6L/min, receive arc ion-gas time 3.0s, shielding gas flow amount 15L/min; Back-protective gas 15L/min, gage of wire 1.2mm, the welding wire trade mark is ER316LSi, tungsten electrode diameter 4.8mm, nozzle bore 3.2mm, welding gun height 6mm, and polarity is straight polarity direct current.
The weld seam of the present embodiment is specious, the defect such as flawless, pore, slag inclusion, undercut.Weld seam detects through 100%RT, 100%UT and 100%PT, meets the requirement of JB/T4730.2-2005I level, JB/T4730.3-2005I level and JB/T4730.5-2005I level respectively; Detect through 1Mpa pressurising, weld seam, without cracking phenomena, meets the production requirement of freeze dryer.
Embodiment 2
Top panel 3, lower panel 7 all adopt the S31603 austenitic stainless steel of thickness 5mm, and parting bead 5 adopts specification to be the S30408 austenitic stainless steel square tube of 12.7mm × 12.7mm × 2.0mm.
Voltage-withstand test requires that P is 1Mpa, tensile strength sigma b-S31603 >=the 480MPa of S31603, tensile strength sigma b-S30408 >=the 520MPa of S30408, σ b gets min{ σ b-S31603, σ b-S30408}=min{480,520}=480Mpa, safety coefficient n gets 1.5, flaggy length a gets 1200mm, width b gets 900mm, if plasma weld seam minimum widith w is 2mm, flaggy inconel weld number m1 gets 108, above-mentioned parameter is substituted into formula l1 >=n × P × a × b/(m1 × w × σ b), show that every bar fusion length is l1 >=15.625mm.15.625mm is reached in order to ensure back of weld penetration length; In actual mechanical process, welding gun walking length gets l1=25mm; If when between moulding and panel, average layout parting bead number m2 gets 9, parting bead length l3 is 1100mm, and fusion length is l1=25, then weld pitch is l2=(1100-25 × (108/9)/(108/9+1)=62mm.
Adopt SECO shown in Fig. 5, described automatic plasma welding time sequence parameter is: striking current 225A, arcing time 2.0s, electric current climbing time 2.0s, welding current 230A, electric current cone change time 2.0s, cone becomes section electric current 120A, and cone becomes section time 5.0s, electric current down slope time 2.0s, receive arc current 100A, receive arc time 5.0s; Wire feed time delay 0.2s, starting the arc wire feed rate 200mm/min, starting the arc wire feed time 3.8s, solder wire convey speed 500mm/min, cone becomes wire feed rate 800mm/min, and cone becomes wire feed time 7.0s, receive arc wire feed rate 300mm/min, receive arc wire feed time 4.0s, spinning speeds 300mm/min, reel off raw silk from cocoons time 2.0s; Walking time delay 2s, speed of welding 210mm/min; Starting the arc ion-gas flow 1.0L/min, starting the arc ion-gas time 2.0s, ion-gas climbing time 2.0s, welding ion-gas flow 1.5L/min, ion gas coning becomes time 2.0s, cone becomes section ion-gas flow 1.0L/min, cone becomes section ion-gas time 5.0s, ion-gas down slope time 2.0s, receives arc ion-gas flow 0.6L/min, receive arc ion-gas time 5.0s, shielding gas flow amount 15L/min; Back-protective gas 15L/min, gage of wire 1.2mm, the welding wire trade mark is ER316LSi, tungsten electrode diameter 4.8mm, nozzle bore 3.2mm, welding gun height 5mm, and polarity is straight polarity direct current.
The weld seam of the present embodiment is specious, the defect such as flawless, pore, slag inclusion, undercut.Weld seam detects through 100%RT, 100%UT and 100%PT, meets the requirement of JB/T4730.2-2005I level, JB/T4730.3-2005I level and JB/T4730.5-2005I level respectively; Detect through 1Mpa pressurising, weld seam, without cracking phenomena, meets the production requirement of freeze dryer.
Embodiment 3
Top panel 3, lower panel 7 adopt thickness to be the S31603 austenitic stainless steel of 6mm, and parting bead adopts specification to be the S30408 austenitic stainless steel square tube of 12.7mm × 12.7mm × 1.5mm.
Voltage-withstand test requires that P is 1Mpa, tensile strength sigma b-S31603 >=the 480MPa of S31603, tensile strength sigma b-S30408 >=the 520MPa of S30408, σ b gets min{ σ b-S31603, σ b-S30408}=min{480,520}=480Mpa, safety coefficient n gets 1.5, flaggy length a gets 1200mm, width b gets 900mm, if plasma weld seam minimum widith w is 2mm, flaggy inconel weld number m1 gets 108, above-mentioned parameter is substituted into formula l1 >=n × P × a × b/(m1 × w × σ b), show that every bar fusion length is l1 >=15.625mm.15.625mm is reached in order to ensure back of weld penetration length; In actual mechanical process, welding gun walking length gets l1=25mm; If when between moulding and panel, average layout parting bead number m2 gets 9, parting bead length l3 is 1100mm, and fusion length is l1=25, then weld pitch is l2=(1100-25 × (108/9)/(108/9+1)=62mm.
Adopt SECO shown in Fig. 5, described automatic plasma welding time sequence parameter is: striking current 100A, arcing time 2.0s, electric current climbing time 2.0s, welding current 240A, electric current cone change time 2.0s, cone becomes section electric current 120A, and cone becomes section time 5.0s, electric current down slope time 2.0s, receive arc current 100A, receive arc time 4.0s; Wire feed time delay 0.2s, starting the arc wire feed rate 200mm/min, starting the arc wire feed time 3.8s, solder wire convey speed 500mm/min, cone becomes wire feed rate 650mm/min, and cone becomes wire feed time 7.0s, receive arc wire feed rate 300mm/min, receive arc wire feed time 3.0s, spinning speeds 300mm/min, reel off raw silk from cocoons time 2.0s; Walking time delay 2.0s, speed of welding 200mm/min; Starting the arc ion-gas flow 1.5L/min, starting the arc ion-gas time 1.5s, ion-gas climbing time 2.0s, welding ion-gas flow 2.0L/min, ion gas coning becomes time 2.0s, cone becomes section ion-gas flow 1.0L/min, cone becomes section ion-gas time 5.0s, ion-gas down slope time 2.0s, receives arc ion-gas flow 0.6L/min, receive arc ion-gas time 4.0s, shielding gas flow amount 15L/min; Back-protective gas 15L/min, gage of wire 1.2mm, the welding wire trade mark is ER316LSi, tungsten electrode diameter 4.8mm, nozzle bore 3.2mm, welding gun height 5mm, and polarity is straight polarity direct current.
The weld seam of the present embodiment is specious, the defect such as flawless, pore, slag inclusion, undercut.Weld seam detects through 100%RT, 100%UT and 100%PT, meets the requirement of JB/T4730.2-2005I level, JB/T4730.3-2005I level and JB/T4730.5-2005I level respectively; Detect through 1Mpa pressurising, weld seam, without cracking phenomena, meets the production requirement of freeze dryer.
Embodiment 4
Top panel 3, lower panel 7 all adopt thickness to be the S31603 austenitic stainless steel of 6mm, and parting bead 5 adopts specification to be the S30408 austenitic stainless steel square tube of 12.7mm × 12.7mm × 2.0mm.
Voltage-withstand test requires that P is 1Mpa, tensile strength sigma b-S31603 >=the 480MPa of S31603, tensile strength sigma b-S30408 >=the 520MPa of S30408, σ b gets min{ σ b-S31603, σ b-S30408}=min{480,520}=480Mpa, safety coefficient n gets 1.5, flaggy length a gets 1200mm, width b gets 900mm, if plasma weld seam minimum widith w is 2mm, flaggy inconel weld number m1 gets 108, above-mentioned parameter is substituted into formula l1 >=n × P × a × b/(m1 × w × σ b), show that every bar fusion length is l1 >=15.625mm.15.625mm is reached in order to ensure back of weld penetration length; In actual mechanical process, welding gun walking length gets l1=25mm; If when between moulding and panel, average layout parting bead number m2 gets 9, parting bead length l3 is 1100mm, and fusion length is l1=25, then weld pitch is l2=(1100-25 × (108/9)/(108/9+1)=62mm.
Adopt SECO shown in Fig. 5, described automatic plasma welding time sequence parameter is: striking current 250A, arcing time 0s, electric current climbing time 0s, welding current 250A, electric current cone change time 2.0s, cone becomes section electric current 120A, and cone becomes section time 5.0s, electric current down slope time 2.0s, receive arc current 100A, receive arc time 3.0s; Wire feed time delay 1s, starting the arc wire feed rate 800mm/min, starting the arc wire feed time 1.0s, solder wire convey speed 800mm/min, cone becomes wire feed rate 650mm/min, and cone becomes wire feed time 7.0s, receive arc wire feed rate 300mm/min, receive arc wire feed time 3.0s, spinning speeds 300mm/min, reel off raw silk from cocoons time 2s; Walking time delay 1.0s, speed of welding 200mm/min; Starting the arc ion-gas flow 2.0L/min, starting the arc ion-gas time 0s, ion-gas climbing time 0s, welding ion-gas flow 2.0L/min, ion gas coning becomes time 2.0s, cone becomes section ion-gas flow 1.0L/min, cone becomes section ion-gas time 5.0s, ion-gas down slope time 2.0s, receives arc ion-gas flow 0.6L/min, receive arc ion-gas time 3.0s, shielding gas flow amount 15L/min; Back-protective gas 15L/min, gage of wire 1.2mm, the welding wire trade mark is ER316LSi, tungsten electrode diameter 4.8mm, nozzle bore 3.2mm, welding gun height 6mm, and polarity is straight polarity direct current.
The weld seam of the present embodiment is specious, the defect such as flawless, pore, slag inclusion, undercut.Weld seam detects through 100%RT, 100%UT and 100%PT, meets the requirement of JB/T4730.2-2005I level, JB/T4730.3-2005I level and JB/T4730.5-2005I level respectively; Detect through 1Mpa pressurising, weld seam, without cracking phenomena, meets the production requirement of freeze dryer.
In sum, the invention enables the use of freeze dryer more reliable and more stable, the welding procedure of flaggy is simple, welding efficiency is high, layer structure intensity is high, anti-pressure ability is strong, welding deformation is little, fatigue resistance performance is good, and significantly reduces the probability of maintenance.
Claims (6)
1. a welding method for freeze dryer flaggy parting bead, is characterized in that: be placed between top panel (3) and lower panel (7) by some parting beads (5) of parallel distribution, welded, take following steps in welding by the method for plasma arc welding (PAW):
A. flaggy and parting bead (5) surface are cleared up, wipe oil, dust;
B. parting bead (5) spot welding is fixed on the upper surface of lower panel (7), top panel (3) is placed on the another side of parting bead (5), make top panel (3) and lower panel (7) parallel alignment, longitudinal moulding (1) and top panel (3), lower panel (7) spot welding are fixed together;
C. weld jig is used to clamp described top panel (3) and lower panel (7), automatic plasma welding method is adopted to weld flaggy parting bead (5), weld seam between first welds upper plate (3) and parting bead (5), then weld the weld seam between lower panel (7) and parting bead (5), the parameter of automatic plasma welding is:
Welding current 50 ~ 300A, ion-gas flow 0.1 ~ 10L/min, shielding gas flow amount 1 ~ 50L/min; wire feed rate 50 ~ 2000mm/min, gage of wire 0.8 ~ 1.6mm, tungsten electrode diameter 2.4 ~ 6.4mm; nozzle bore 2 ~ 5mm, welding gun height 3 ~ 15mm, polarity is straight polarity direct current.
2. the welding method of freeze dryer flaggy parting bead according to claim 1, it is characterized in that: in automatic plasma arc-welding step, first welding is positioned at the weld seam of top panel (3) center and parting bead (5), welding is positioned at the weld seam of top panel (3) two boundary and parting bead (5) again, finally by the weld seam of border welds upper plate (3) and parting bead (5) gradually to center.
3. the welding method of freeze dryer flaggy parting bead according to claim 2, it is characterized in that: after completing the welding of top panel (3) and parting bead (5), flaggy and fixture integrated overturn 180 ° thereof, carry out welding of lower panel (7) and parting bead (5), first welding is positioned at the weld seam of lower panel (7) center and parting bead (5), welding is positioned at the weld seam of lower panel (7) two boundary and parting bead (5) again, is finally welded the weld seam of lower panel (7) and parting bead (5) gradually to center by border.
4. the welding method of freeze dryer flaggy parting bead according to claim 3, is characterized in that: be provided with the starting the arc, climbing, cone change in described automatic plasma welding method, decline and receive arc SECO, and automatic plasma welding time sequence parameter scope is:
Striking current 50 ~ 300A, arcing time 0 ~ 25.0s; Electric current climbing time 0 ~ 50.0s, welding current 50 ~ 300A; Electric current cone change time 0 ~ 50.0s, cone becomes section electric current 50 ~ 250A, and cone becomes section time 0 ~ 25s; Electric current down slope time 0 ~ 50.0s, receives arc current 40 ~ 150A, receives arc time 0 ~ 25s; Wire feed time delay 0 ~ 5.0s, starting the arc wire feed rate 0 ~ 2000mm/min, starting the arc wire feed time 0 ~ 75.0s, solder wire convey speed 0 ~ 2000mm/min, cone becomes wire feed rate 0 ~ 2000mm/min, cone becomes wire feed time 0 ~ 75.0s, receives arc wire feed rate 0 ~ 2000mm/min, receives arc wire feed time 0 ~ 75s; Spinning speeds 0 ~ 1000mm/min, reel off raw silk from cocoons time 0 ~ 5.0s; Walking time delay 0 ~ 25s, speed of welding 50 ~ 1000mm/min; Starting the arc ion-gas flow 0.1 ~ 10L/min; the starting the arc ion-gas time 0 ~ 25.0; ion-gas climbing time 0 ~ 50.0s, welding ion-gas flow 0.1 ~ 10L/min, ion gas coning becomes time 0 ~ 50.0s; cone becomes section ion-gas flow 0.1 ~ 10L/min; cone becomes section ion-gas time 0 ~ 50.0s, ion-gas down slope time 0 ~ 50.0s, receives arc ion-gas flow 0.1 ~ 10L/min; receive arc ion-gas time 0 ~ 25.0s, shielding gas flow amount 0 ~ 50L/min.
5. the welding method of freeze dryer flaggy parting bead according to claim 4, is characterized in that: described parting bead (5) all adopts intermittent weld to be connected with top panel (3), lower panel (7).
6. the welding method of freeze dryer flaggy parting bead according to claim 5, is characterized in that: described parting bead (5) is made up of square tube or square steel or i shaped steel.
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| JPH0825050A (en) * | 1994-07-11 | 1996-01-30 | Tokyo Gas Co Ltd | Welding method of fixed tube in pipeline |
| CN101780574A (en) * | 2010-03-16 | 2010-07-21 | 上海东富龙制药设备制造有限公司 | Welding method of ribs of plate layer of freeze dryer |
| CN101839621A (en) * | 2010-03-16 | 2010-09-22 | 上海东富龙制药设备制造有限公司 | Brazing sheet layer structure of freeze dryer |
| CN201621938U (en) * | 2010-03-16 | 2010-11-03 | 上海东富龙制药设备制造有限公司 | Brazing sheet layer of freeze dryer |
| CN102029477A (en) * | 2010-12-01 | 2011-04-27 | 上海共和真空技术有限公司 | Welding structure and welding method for ply of freeze dryer |
| CN103358005A (en) * | 2012-03-27 | 2013-10-23 | 昆山荣仕杰自动焊接设备有限公司 | Energy-storage-type resistance welding machine special for freeze dryer shelf |
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2014
- 2014-04-23 CN CN201410165260.4A patent/CN103949764B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0825050A (en) * | 1994-07-11 | 1996-01-30 | Tokyo Gas Co Ltd | Welding method of fixed tube in pipeline |
| CN101780574A (en) * | 2010-03-16 | 2010-07-21 | 上海东富龙制药设备制造有限公司 | Welding method of ribs of plate layer of freeze dryer |
| CN101839621A (en) * | 2010-03-16 | 2010-09-22 | 上海东富龙制药设备制造有限公司 | Brazing sheet layer structure of freeze dryer |
| CN201621938U (en) * | 2010-03-16 | 2010-11-03 | 上海东富龙制药设备制造有限公司 | Brazing sheet layer of freeze dryer |
| CN102029477A (en) * | 2010-12-01 | 2011-04-27 | 上海共和真空技术有限公司 | Welding structure and welding method for ply of freeze dryer |
| CN103358005A (en) * | 2012-03-27 | 2013-10-23 | 昆山荣仕杰自动焊接设备有限公司 | Energy-storage-type resistance welding machine special for freeze dryer shelf |
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