JIS-C-9303-1993-R2003-ENG.pdf

J IS JAPANESE I NDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Stationary type single phase AC spot welding machines 1 ICs 25.160.30 Descriptors : spot welding, alternating current, single-phase current, stationary, Reference number : JIS C 9303 : 1993 (E) welding equipment, welding 7s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:45:31 MDTNo reproduction or networking permitted without license from IHS -,-,- C 9303 : 1993 Foreword This translation has been made based on the original Japanese Industrial Standard revised by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law: I “ I Date of Establishment: 1956-12-01 Date of Revision: 1993-03-01 Date of Public Notice in Official Gazette: 1993-03-23 Investigated by: Japanese Industrial Standards Committee Divisional Council on Electricity JIS C 9303 : 1993, First English edition published in 2000-02 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. b L 1 O JSA 2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:45:31 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 JAPANESE INDUSTRIAL STANDARD JIS C 9303 : 1993 (Reaffirmed: 1998) Stationary type single phase AC spot welding machines 1 Scope This Japanese Industrial Standard specifies stationary type spot welding machine, hereafter referred to as “welder” , composed mainly of a single phase trans- former of a frequency of 50 Hz or 60 Hz, electronic switch and a pneumatic electrode pressing device, and principally used for welding thin steel plates. Remarks : The normative references to this Standard are as follows. JIS C 9305 JIS C 9313 General rule for resistance welding machines Control equipments of resistance welding machines of lap join t Thyristorstacks for resistance welding machine Carbon steel pipes for ordinary piping JIS C 9319 JIS G 3452 2 Definitions For the purpose of this Standard, the following definitions apply: duty cycle The ratio of on-load time to the total period when a constant load is intermitted, as expressed in percentage. rated capacity The on-load input power which complies with the specified tem- perature rise when a welder is loaded at the rated input voltage of rated frequency and a duty cycle of 50 % by adjusting the load, as expressed in kVA. maximum input voltage at no-load The maximum voltage which can be applied across input terminals of a welder. input voltage at maximum load A voltage across input terminals of a welder when the rated maximum welding current is passed. maximum secondary no-load voltage A secondary open-circuit voltage when the rated input voltage is applied to the tap which can produce the maximum current of a welding transformer. maximum short-circuit current A current flowing through the secondary circuit when the maximum on-load input voltage of rated frequency is applied to the tap which can produce the maximum current of a welding transformer while the upper and lower electrodes are short-circuited under the standard throat dimensions. maximum welding current A current equal to 90 % of the maximum short-circuit current. rated maximum welding current A nominal current stated in the nameplate cor- responding to 90 % of the maximum short-circuit current. rated marimum welding input power The apparent power at the input side when the rated maximum welding current is passed, as expressed in kVA. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:45:31 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS C 9303-ENGL I1993 E 4933608 0561015 490 Type Rated Standard throat Rated Rated Stroke of (informative) capacity dimensions maximum welding electrode Allowable duty cycle Press type Rocker- (duty cycle Throat Hom force for rated maximum armtype 50%) depth spacing welding current mm mm (approximate kVA A kN mm value) % P1 R i 15 400 9 O00 2.9 40 8 P2 R2 25 600 12 O00 4.4 7 30 400 50 200 15 O00 5.9 6 35 600 50 400 18 O00 8 9 . 8 60 R6 75 22 O00 7 i 2 C 9303 : 1993 (10) allowable duty cycle at rated maximum welding current The allowable value of duty cycle in compliance with the specified temperature rise when the relay inter- rupts the rated maximum welding current under the rated voltage of rated fre- quency, provided the period of interrupting the rated maximum welding current is 60 sec. (il) rated welding force A pressing force of electrodes which is guaranteed when com- pressed air of 490 kPa is used under the standard throat dimensions. (12) standard throat depth The distance between the center line of electrode holders and the front face of a welder body. (13) horn spacing The distance between the upper arm mechanism and lower arm mechanism when movable parts thereof are set to their standard positions. The standard positions of upper and lower arms are such positions where the upper arm is raised 15 mm above the lowest position of electrode stroke and the lower arm is so adjusted that the interval between the two arms is minimum. (14) stroke of electrode A vertical span in which the upper electrode of a welder can make up-and-down movements. (15) standard height of working place The height from the floor to the center line of the horn spacing (standard value). 3 Table 1. Classification Welders are classified by the types and characteristics as given in Remarks 1 Symbols used for type designation mean the following: P : press type R : rocker-arm type I I 2 When there is no ambiguity, type P1 and type R1 may be calied type 1, b and this can be extended to types 2 to 6. 4 Standard service conditions The standard service conditions shall comply with 3 of JIS C 9305. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:45:31 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 C 9303 : 1993 5 Coolingwater 5.1 Temperature of water The temperature of cooling water used for welders shall not exceed 30 “C at their inlet ports. 5.2 Quality of water The electric resistivity of cooling water for thyristors used in the main circuit shall be not less than 5 OOOs1 -cm and the quality of water shall be similar to that of industrial water. This requirement does not apply, however, to the cooling water used for thyristor whose water cooler is insulated electrically. 5.3 Flow rate and pressure of water The flow rate of cooling water of welder shall not exceed 6 ilmin for types 1 and 2, and 10 Zlmin for types 3 to 6. Further, the pressure difference between inlet and outlet shall be 69 kPa or under when water is passed at the flow rate indicated on the nameplate. 6 Ratings 6.1 Rated frequency The rated frequency shall be 50 Hz or 60 Hz. 6.2 Rated input voltage The rated input voltage (at no-load) shall be 200 V or 400 V. 6.3 Maximum input voltage at no-load The maximum input voltage at no-load shall be 230 V and 460 V when the rated input voltage is 200 V and 400 V, respectively. 6.4 Input voltage at maximum load The input voltage at maximum load shall be 180 V and 360 V when the rated input voltage is 200 V and 400 V, respectively. 7 Characteristics 7.1 Electrical characteristics 7.1.1 Rated capacity Welders shall have the rated capacities given in Table 1. 7.1.2 input power) of JIS C 9305 when the test of 10.2 is carried out. No-load input power The no-load input power shall comply with 6.1.1 (No-load 7.1.3 No-load secondary voltage The no-load secondary voltage of a welding trans- former shall be adjusted over the range from the maximum value to 65 % by taps of 4 steps or more. When the adjustment equivalent to the above can be performed by other control devices, however, the above requirement is excepted. 7.1.4 Maximum welding current The maximum welding current shall be within the range 100 % to 110 % of the value of the rated maximum welding current given in Table 1 when the test of 10.4 is carried out. 7.1.5 Allowable duty cycle The allowable duty cycle shall be as follows: Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:45:31 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 C 9303 : 1993 Type Type 1 Type 2 Type 3 Type 4 Type 5 Type 6 allowable duty cycle for rated maximum welding current The indicated value of the allowable duty cycle for rated maximum welding current shall satisfy the value calculated on the basis of the test of 10.6. allowable duty cycle for each tap of welding transformer When a welding trans- former is provided with taps, the allowable duty cycle for each tap shall satisfy the value obtained from the following formula: Eccentric Deflection of Deflection of Electrode skid Speed of op- welding force upper frame lower arm eration welding force mm mm mm pointdmin Central 0.85 0.65 0.8 0 . 4 180 O. 70 1 . 0 140 120 80 a,(%)=a, x- E20 E2N where, aN : allowable duty cycle for each tap a, : allowable duty cycle for rated welding current E, : maximum secondary voltage at no-load E 2 N : secondary voltage at no-load for each tap 7 . 1 . 6 Temperature rise The temperature rise of welding transformer windings shall comply with 6 . 1 . 4 of JIS C 9305 when the test of 1 0 . 7 is carried out. 7 . 1 . 7 Withstand voltage The withstand voltage of welding transformer shall comply with 6 . 1 . 5 of JIS C 9305 when the test of 1 0 . 8 is carried out. 7 . 2 Mechanical characteristics 7 . 2 . 1 Maximum welding force The maximum welding force shall be not less than the relevant rated welding force given in Table 1, when measured by the method of 1 0 . 9 . 7 . 2 . 2 Adjustable range of welding force The welding force shall be continuously ad- justable throughout the range from 30 % to 100 % of the relevant rated welding force given in Table 1 when measured by the method of 10.10. 7 . 2 . 3 Eccentric welding force The ratio of the eccentric welding force to the central welding force shall be not less than the value given in Table 2, when measured by the method of 10.11. Table 2 Mechanical characteristics . I r' Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:45:31 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 C 9303 : 1993 vPe ' of hole 7.2.4 Deflections of upper frame and lower arm The deflections of upper frame and lower arm shall not exceed the relevant value given in Table 2, when measured by the method of 10.12. Diameter Diameter o1 of electrode insertion holder hole for ele( trode mm Type 1 25 7.2.5 Electrode skid The electrode skid shall not exceed the value given in Table 2, when measured by the method of 10.13. mm 15.5 7.2.6 Speed of operation The speed of operation shall be not less than the relevant value given in Table 2, when measured by the method of 10.14. ?aper of elec- rode 8 Construction I Length of ta- pered part 8.1 Mechanical construction Type5 Type 6 8.1.1 Pressure mechanism A welder shall draw its welding force from compressed air, and the types of the pressure mechanism are classified into press type and rocker-arm type. 32 19 8.1.2 Throat depth The throat depth of a welder shall be not less than the value given in Table 1. 8.1.3 Horn spacing The horn spacing of a welder shall be not less than the value given in Table 1. 8.1.4 Stroke of electrode The stroke of electrode of a welder shall be not less than the value given in Table 1. 8.1.5 Electrode holder The diameter of electrode holder, diameter of insert hole for electrode, taper of electrode and length of tapered part shall be as given in Table 3. Table 3 Dimensions of electrode holder Electrode Diameter Electrode holder in?*ion Remarks : Tolerance of diameter of insertion hole for electrode shall be %. 8.1.6 Standard height of working place The standard height of working place of Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:45:31 MDTNo reproduction or networking permitted without license from IHS -,-,- 6 C 9303 : 1993 welders shall be 900 mm. 8.2 Electrical construction 8 . 2 . 1 Thyristor stack The appropriate thyristor stack specified in JIS C 9319, or the equivalent or superior in performance shall be used for main current circuit. 8 . 2 . 2 characteristics at least equal to those of type N2 specified in JIS C 9313. Control device A welder shall be provided with a control device which has the 8 . 3 Piping system for cooling water The size of piping system for cooling water shall be adequate for its passage at the flow rate indicated on the nameplate with the pres- sure difference of 69 kPa or under between inlet and outlet. The cooling water system shall withstand the hydraulic pressure of 290 kPa. As a rule, appropriate joints should be used : “he 3/8 B carbon steel pipe specified in JIS G 3452 at the water inlet port, and the 1 1 2 B carbon steel pipe at the water outlet port. 8.4 Piping system for compressed air Standard pressure of compressed air used for welders shall be 490 kPa and the parts used for the pneumatic system shall withstand the pneumatic pressure of 690 kPa. The carbon steel pipe corresponding to 3/8 B of JIS G 3452 shall be used for inlet side piping. However, the carbon steel pipe corresponding to 1/2 B of JIS G 3452 shall be used for welders of types 5 and 6, as a rule. 9 Safety 9.1 piping for cooling water The cooling system of a welder integrating thyristors, etc., and requiring the cooling water shall comply with the following provisions: (1) Welders shall be so constructed that metallic parts having a length of 50 mm or more along the water flow are provided at the inlet and outlet ports and are e