1、i MILITARY SPECIFICATION MIL-W-13768B (Ord) 27 June 1960 SUFmDING 20 January 1958 MIL-W-137688 (%d) WELDING MACHINE, ARC , GASOLINEENGINE-DRIVEN (WITH AUXILIARY “ER SOURCE) 1. SCOPE r -it 1.1 Scope.- This specification covers 3-ampere, direct-chent, gasoline-engine-driven arc-welding machines with a
2、n auxiliary power source. cation shall -be of the following types (see 6,2). 1.2 Classification.- The welding machines covered by this specifi- Type I - Skid-base mounted. Type II Type III - Trailer mu+ted. - Shop wheel mounted. 2. APPLICABLE WCUMEMrn 2.1 The following documents of the issue in effe
3、ct on date of invi- tation for bids, form a part of this sp-ecification to the extent.specifie herein. SPECIFICATIOIW Federal QQ-N-290 - Nickel Plating (Electrodeposited). QQ-P-4l6 - Plating, Cadmium (Electrodeposited), Provided by IHSNot for ResaleNo reproduction or networking permitted without lic
4、ense from IHS-,-,-MbW-13768B (Ord) rr-E-489 TT-P-636 TT=P-664 TT-P-666 PPP-B-601 PPP-B -621 PPP- T-76 Military MIL-M-6 JAN-P-100 MIL-c-io4 MIL-P-116 MIL-B-130 MIL-v-I73 MIL-P-207 JAN-P-65 8 MIL-T-704 JAN-C-7a MIEH-865 MIEV-1137 MIEP-3345 a rpciEF_i_._- f - MIL- W -i37 bB 3L1 W 0b 02L14b50 3 Enamel;
5、Gloss, Synthetic (for Ekterior and Interior Surfaces) . Primer Coating, Synthetic, Wood and Ferrous Metal Primer Coating, Synthetic, Rust-Inhibitiilg, Lacquer-Resisting, Paint; Primer, Zinc Yellow for Aiuninum and IkgnesiumSurf aces Boxes, Wood, Nailed and Lock-Corner, Tape, PressureSensiLive Adhesi
6、ve, Paper, Wa ter-Resistant, EOXB, Wood, ClWted-PlmOd* Meters, Electrical Indicating, Panel me, 2-1/2 Inch and 3-1/2 Inch, General Specifi- cation for, Packaging and Packing for Overseas Shipment General Specification. Crates, Wood; Lumber and Plywood Blheathed, Nailed and Bolted. Preserva tion, Met
7、hods of , Barrier-Ekiterial, Paper, Noncorrosive. Varnish, Moisture-and Eiuigus-Resistant, for the Treatment of Codcations, Elec- tronic, and Associated Electrical Equip- ment * Packaging and Packing for Domestic and (hrerseas Shipment and Storage; Electrolyte, Storage Battery. Extinguishers, Fire,
8、Carbon Dioxide, (Port- able, Permanent Shutoff, Rand and Wheeled Types) Packaging and Packing of Electrical Equip ment and Spare Parts (ELectronic, Electrical, and Electro-Mechanical) Treatment and Painting of , and !bailer Dollies, Packaging of Weldhgb c -I_ -. Provided by IHSNot for ResaleNo repro
9、duction or networking permitted without license from IHS-,-,-MIL-c-554.l -10062 MIL-E-11275 MIL-1-11683 MIL-C-12968 MIL-C-13993 MIL-P-15421, - Chemical Films for U.um and Aluminm - Engines, Spare or Installed (Other Than Aircraft); Preparation for Shipment and Storage of. - Engines, Gasoline, Indust
10、rial-Type, General Specification for. - - Interference Suppression, Radio, Require- ments for Engine Genertors and Miscella- neous Engines. - Coatings, Phosphate, Protective (for Iron and Steel). - Connector, Plug, Electrical; Connector, Receptaclef mectrical (For Military Vehicles) Packaging of Han
11、d Tools for Domestic and Overseas Shipment and Storage. Electrodes, Welding, (Medium Steel) . Electrodes, Welding, Mineral Covered, Low Hydrogen, Medium and High Tensile Steel Stress-Relieved Weld Application. Alloys . - - - STANDARDS Fed. SM. No. 595 - Colors. Military MIL43TD-LO5 - 3ampling Proced
12、ures and Tables for Inspection MILSTD-129 - Marking for Shipment and Storage. MIESTD-130 - Identification Marking of U. 3. Military MILSTD-24.8 - Qualification Tests forwelders. by Attributes. Property. ORDNANCE DRAWINGS I35338302 - Plug, Commerciai. (Copies of specifications, standards, drawings, a
13、nd publications re- wired by contractors in connectior.- The engine shall have a rating capable of driving the welding generator and all accessories, with the welding generator delivering the rated amperes and at rated voltage continuously, without exceeding the specified cooling system limits confo
14、rming to the group II requirements of Specification MIEF11275. 3.7.1.2 Fuel sustem.- The fuel system shall employ a fuel tank of The fuel tank shall be insulated for The fuel shall be fed to The tank or fuel Line shall be pro- not less than 15 gallons capacity. protection from grounding and short ci
15、rcuits. the engine by means of a fuel pump. vided with means for connection to an auxiliary fuel supply. 3.7.1.3 Exha ust mst em.- The muffler shall be asbests overwrapp- with a mesh grid for protection and to confine heat. !Che muffler tail pipe - 7 -* !* -;it.-* 3 - . t 1 ; a i Provided by IHSNot
16、for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-137688 3Y W 777790b 02YYbCb 4 W MIEW-13768B (. with sealed type antifriction bearings, of the welding generator shall not exceed the required limits of the gasoline engine, The welding generator shall be of 2 variab
17、le voltage single operator type, so that the voltage at any setting within the welding range specified “he balance and vibration limits Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-13768B (Ord) in Table I and 3.7.2.2.1, shall automatically r
18、educe as the current increases with continuity, speed, and amount of change to provide a stable arc opera- tion and satisfactory welds when utilizing electrodes specified in 3.6,i. 3.7.2.1 Power output.- The welding generator shall have the power rating and welding current range as shown in Table I.
19、 TABLE I 1 Amperes Rating 2 Load Volts 3 Duty Cycle Percent 60 Welding current range 4 Min. Amperes at 20 Load Volts 60 L 5 Max. Amps. at Rated Load Volts 375 Duty Cycle Percent at Max. Amperes and Rated Load Volts 1 - 3.7.2,l.l Rated output.- The welding generator shall be capable of delivering the
20、 rated output of 300 amperes at 40 volts on a 60 percent duty cycle consisting of the rated load applied continuously for 6 minutes follow- ed by 4 minutes at no lead (as shown in coluinrrs 1, 2, and 3 of Table I). ,3.7.2.1.2 outDu$.- The welding generator shall be capable of delivering the maximum
21、output of 375 amperes at 40 volts on a 35 percent duty cycle consisting of minutes at no load without exceeding the temperature requirements of Table II . minutes at 375 amperes load followed by 6$ 3.7.2.2 he ratine: characteristics . - 3.7.2.2.1 Current adjustment.- Current within the range of 60 a
22、mperes The current shall . through 375 amperes shall be obtained at any voltage between 20 volts and 40 volts (rated voltag-e) inclusive (as shown in Table I). be adjustable between %he minimum and maximum values in not less than 30 increments. adjustment. the next higher stting shall not exceed 5 p
23、ercent of the current at the lower setting. Not more than two controls are to be provided for current At rrited voltage, the increase in current from any setting to A setting is defined as a point of adjustment of the welding . Provided by IHSNot for ResaleNo reproduction or networking permitted wit
24、hout license from IHS-,-,-MIL-W-137688 3L1 W 949440b 02L14bC generator controlB. 3,7,2,2,2 oms oircuit vola,- The maxim open cirmtt voltage at the generator output terminas, when the generator is set for ma- exoitation and with the engine operating at %he governed apeed, shall not exceed 90 volts un
25、der any operating condition, 3 ,7 2,2,3 Volt-amere characteristic - Volt-ampere cham c t eristic of any setting is a plot of the terminal voltage veras generator output current for that Betting as an attached load 5s varied to draw output cur- rent fmm zero %o short circuit current, Volt-ampere Char
26、acteristic curves shall show that at aU points below rated voltages, the voltage decreaseet with an increase in current. No point of a curve shall indicate a current higher than that for short circuit uner static load. 3.7+2,3 Ort cir cuit and rec ovem characteriau *- 3,1.2.3.1 Short circuit me r-M-
27、6 (see 3.7.4), 3.7.5.1.3.5 ReceDtac1eg.- Unless otherwise specified, an outlet circuit shall be provided consisting of two combination 2 pole 3 pole duplex type receptacles (see 6.2). 3.7.6 Wiring and cables*- 3.7.6.1, Wiring.- The wire shall have a stranded or solid copper core with approved inaula
28、tion conforming to the applicable requirements of the ?Jational Electrical Code, NBFU, Pamphlet No, 70, 1959. ing w I _-_- - - ;- With a variable resist- ance load continually adjusted to maintain rated voltage at the welding machine terminals, measurements shall be taken of the current output at ea
29、ch setting of the controls. The measured values shall be recorded, together with the control. settings, and compared with the specification requirements. requirements shall be considered cause for rejection of the unit (see 3.7.2.2.1). 4.4.6 Temperature rise tests.- Tenperature rise tests shall be T
30、est results shall AU temperature readings shall be taken at the Test results Failure Failure of the welding machine to meet specification mde on the completely assembled welding machine, comply with table II. end of the load period of the 6% duty cycle, with electrical data readings baing taken at i
31、ntervals sf not less than four per hour. I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-13768B (Ord ) 4.4.6.1 Ambient temperature.- The ambient temperature shall be meas- ured by means of two or more thermometers placed at different points a
32、round and on a level with the welding machine and at a distance of three to six feet therefrom. The welding wchine shall be tested at any convenient room temperature above 1003. (500F.). The temperature rise for the specified components (see table II) of the welding machine shall be considered in- d
33、ependent of ambient temperature between 1OOC. (500C. ) and 5003. (1220F.). 4.4.6.2 Csdes.- The welding machine shall be run at rated output of 300 amperes at 40 load volts against a resistance load applied for four hours in ten minutes cycles of continuous load for six minutes followed by four minut
34、es with engine idling at full governed idle speed. following the four .hour period. the welding nachine shall be operated for an additional two hours delivering maximum output of 375 amperes at 40 load volts on a 35 percent duty cycle. be recorded. specified in table II and 3.7.2.4 shall be consider
35、ed cause for rejection of the unit. Immediately The results of the above tests shall Fzilure of the welding machine to meet specified requirements 4.4.6.3 Temperature rise detection.- The temperature of the welding generator and components shall be measured during the above test by means of thermome
36、ters, imbedded detectors or therocouples, or resistance methods. 4.4.7 Short circuit and recoverv tests.- Current-time relationships for these tests shall be determined by means of oscillograms. with open circuit, the welding terminals shall be short circuited by means of .a contactor with blow-out
37、coil. steady, open the short circuit through a resistive load which will give rated current for the setting. The peak short circuit current shall also be determined when starting from normal load conditions, The time of re- covery shall be the time elapsed from the opening of the short circuit . unt
38、il the current is within five percent of the normal for that setting. Simultaneous machine voltage and amperage oscillograms shall be taken when a steady short circuit current is opened through a resistive load which will give normal load-for that setting. characteristics, as specified in 3.7.2.3, s
39、hall be determined for at least the following settings: (a) Starting After the short circuit has become a Short circuit and time of recovery The setting corresponding to the rated output of the genera tor. The setting corresponding to the minimum specified output current at 20 volts. (b) (c) At leas
40、t one other setting, optional with the Government inspector, within the specified range. During these tests the oscillo film shall travel at sufficient speed distinctly the maximum and minim voltages . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
41、MTL-W-13768B (Orcil 4.4A Dlelect ric tes$,- The welding machine shall be subjected to didectrio tests wherein the test voltage specified in 3.7.2.7 shall be appl.ied for periods of one minute successively between each winding and all other windings and the grounded frame. frequency of 60 cycles per
42、second and shall have a wave form approximating 8 true sine wave. be examined for evidence of damage and tested in accordance with 4.4.4.1 (see 367,2.7), The test voltage shall have a Following the dielectric test, the welding machine shall 4.4.9 fhx.Lli arv D ower source t est.- While the welding m
43、achine is being operated in conjunction with the preceding tests, the auxiliary power source shall be tested to determine compliance with the applicable require- ments of 3.7.4 . 4.4.10 Radio Inte rference sumression tes .- The preproduction sample, radio interference suppressed in accord2nce with 3
44、.9, shall be test-3 with Government test equi ment by authorized representatives of the con- tracting officer (see 6.3 P . Upon approval of the preproduction sample-by the contracting officer, and provided all other requirements of this speci- fication are met, the preproduction sample and report sh
45、all be used as the basis for determining conformance of production units with visual inspection requirements governing the suppression system. 4#5 Inspection of preparation for de1ivew.- The preservation, pack- aging, packing, and mrking of the welding machine shall be examined and tested to detemin
46、e conformance with the requirements of Section 5 of this specification, and as required by specifications referenced therein. cept as required by referenced specifications, inspection lots and sampling shall, be in accordance with Standard Mn-djTD-105, with inspection level Lr-5, and an AQL o% 4.0 p
47、ercent defective, Ek- 50 PREPARATION FOR DELfvERp 2.1 Preservation and DackaainP;.- Preservation and packaging shall 5.1.L Level A.-. 5 1 . 1.1 Disa ssembl-g, .- The welding machine shall be disassembled to be level A or C, a1 specified (see 6.2). the extent that economy in packing and shipping shal
48、l be obtained, provided no spealal tools or special skills are required for assembly, and dried in accordance with Specification MIL-P-316. accomplished in accordance with process C-II in accordance with procedure D-1 or D-4 or a combination of both proce- dures . 5,L,1,2 Cleaning and Drvi ng.- The
49、welding machine shall be cleaned Cleaning shall be Drying Shan be accomplished lb -f i: 24 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IIIL-W-13768B (Od) 5.1.1.3 Preservative application.- The welding machine shall be preserved in conformance- with Specification MIL-P-116 Method IIa . to enclosing unit within the b
