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Revid 406
–SELF-LOCATING PROJECTION WELD NUTS
PEM ® weld nuts (Types WN/WNS) provide load-bearing threads in metal sheets too thin to tap, and permit faster asmbly.
PEM brand weld nuts overcome many problems associated with other weld nuts – burn-outs, complicated electrodes and pilots, tedious time-consuming indexing and re-tapping to remove weld spatter. Their design, bad on the experience of hundreds of urs of weld nuts, speeds production using standard equipment, thereby reducing labor costs.
PEM stainless steel weld nuts offer the added advantages of resisting corrosion and being esntiall
y non-magnetic. You may specify steel or stainless steel for your requirements and be sure you are getting the weld nuts that are easiest to install.
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A variety of welding equipment is suitable for installation of PEM weld nuts. Best results have been obtained with a 50KVA press-type, spot-welding machine who upper welding head moves vertically in a straight line with the lower electrode. Flat-faced electrodes with tip diameters .125” / 3.2 mm larger than the “E” dimension of the PEM weld nut should be ud.
WN
8320CU
Type &Material Thread Code Shank Code
Finish
Part Number Designation
WN-2 PennEngineering •
–
The engineered projections of PEM weld nuts prevent burn-outs in thin sheets
Round head of PEM brand weld nuts eliminates tedious, time-consuming indexing. Compact PEM weld nuts fit on narrow flanges.
Look for the PEM trademark on all
cataloged sizes.
Self-locating shanks of PEM weld nuts eliminate the need for pilots and complex electrodes.
The lf-locating shanks not only properly position the weld nuts but they also protect threads from weld spatter and thereby eliminate condary operations such as retapping to remove spatter.
©Copyright 1997, PennEngineering.
PennEngineering • WN-3
Type Min. Hole Size Min. Dist. Thread
Thread Shank Shank A Sheet In Sheet C E T Hole C/L Size Steel Stainless Code Code (Shank) (Shan Shank)Thickness +.004 -.000Max. +.000 -.010 ±.004 To Edge Steel Max. .112-40
WN WNS 440 0 .030 .030 .173 .171 .31 .063 .15 (#4-40)
.138-32
WN WNS 632 0 .030 .030 .193 .191 .34 .093 .17 (#6-32)
.164-32
WN WNS 832 0 .030 .030 .218 .216 .37 .107 .18 (#8-32)
长崎蛋糕.190-24
WN WNS 024 0 .030 .030 .250 .248 .44 .155 .22 (#10-24)
.190-32
倾诉的近义词WN WNS 032 0 .030 .030 .250 .248 .44 .155 .22 (#10-32)
.250-20
WN WNS 0420 0 .048 .050 .316 .315 .52 .185 .26 (1/4-20)
U N I F I E D All dimensions are in inches.
Type Min. Hole Size Min. Dist. Thread Thread Shank Shank A Sheet In Sheet C E T Hole C/L
Size x Steel Stainless Code Code (Shank) (Shan Shank)Thickness +0.1Max. -0.25 ±0.1To Edge Pitch Steel Max. M3X0.5 WN WNS M3 0 0.76 0.77 4.4 4.37 7.85 1.5 4.47 M4X0.7 WN WNS M4 0 0.76 0.77 5.6 5.57 9.4 2.6 5.2 M5X0.8 WN WNS M5 0 0.76 0.77 6.4 6.33 11.2 3.8 5.65 M6X1 WN WNS M6 0 1.24 1.258.1 8.03 13.2 4.6 6.7
M E T R I C
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All dimensions are in millimeters.
Material: WN – Carbon Steel
WNS – 300 Series Stainless Steel
Threads: Internal, ANSI B1.1, 2B/ANSI/ASME B1.13M, 6H Finish: WN – CU - Copper Flash水浒传第五回概括
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WNS – Passivated and/or tested per ASTM A380.
INSTALLATION
1.With a PEM weld nut inrted in the punched or drilled hole of the proper size (e above), bring the electrode force up sufficiently to clamp the projections of the fastener firmly against the sheet without embedding any portion of the projections. Be sure the electrodes are centered, and that the electrode faces are flat so that the force is applied evenly to all three projections.
2.Set the current or heat regulator on the low side and adjust along with the weld time until a good weld is produced. For mild steel, which has a medium electrical resistance, there is a wide range of adjustments possible. For austenitic stainless steel, which has a high electrical resistance, the range is narrow at low heat.
3.Adjust squeeze time so that there is adequate time for the electrodes to clo and develop proper forces (suggested initial tting 35 cycles). The weld period should be established by starting with the ttings
suggested in the tables on page WN-4. As indicated above for current adjustments, a wide range of t
ime is possible with mild steel, but there is a limited range with stainless steel. If weld time starts too soon, and proper welding is not achieved, the squeeze time should be lengthened. Also, the electrodes should be moved clor together so that they require less travel time to clo on the work. Longer squeeze times will have no effect on the quality of the weld. However, they do affect productivity and decrea the number of weld nuts that can be installed per hour. Hold time is t long enough to permit cooling and solidification of the weld before removing the electrodes. Start with 15 cycles and lengthen if necessary.
E
T
C
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PERFORMANCE DATA (1)
GUIDES TO BETTER WELDING
Electrodes, weld nuts, and panels must be clean and free of grea, rust, and metal burrs. When welds appear satisfactory on installed nut, but pushout values are low, one or more of the following may be the cau:(1) Ram pressure too high.(2) Current too low.(3) Panel not clean.
(4) Weld nuts not centered under electrodes.
(5) Hold time not long enough to allow proper cooling.(6) Pressure regulator on welding equipment drifts.
If installed threads are distorted, the following singly or in combination may be the cau:(1) Weld time too long.(2) Current too high.
(3) Ram pressure too high.
Should it be impossible to produce a proper weld becau weld time starts before electrodes clo on the work, shorten the gap between the electrodes so that they take less time to move into position and/or lengthen the squeeze time.
SETTING GUIDES FOR PEM WELD
NUTS IN .030” / 0.77 mm TO .063” / 1.6 mm SHEETS
WN-4
Test Sheet Material Type Thread
.060” Cold-rolled Steel .060” 302 Stainless Steel Code Pushout Torque-out Pushout Torque-out (lbs.) (in. lbs.)(lbs.) (in. lbs.)
440 500 13N/A N/A
632 640 22N/A N/A WN 832 760 33N/A N/A 032 880 56N/A N/A 0420 1000 185N/A N/A 440 N/A N/A 680 13632 N/A N/A 800 28 WNS 832 N/A N/A 850 45032 N/A N/A 900 1100420 N/A N/A 1000 200
U D
E F I I N
Test Sheet Material Type
Thread Cold-rolled Steel 302 Stainless Steel Code Electrode Secondary Weld Electrode Secondary Weld
Ram Force Current Time Ram Force Current Time (lbs.) Amps ±500 Cycles/Sec.(lbs.) Amps ±500 Cycles/Sec. 440 450-500 17,000 6/0.10N/A N/A N/A 632 450-500 17,000 6/0.10N/A N/A N/A WN 832 450-500 17,000 6/0.10N/A N/A N/A 032 500-550 18,000 10/0.17N/A N/A N/A 0420550-600 20,000 10/0.17N/A N/A N/A 440 N/A N/A N/A 450-50016,5006/0.10 632 N/A N/A N/A 450-50016,5006/0.10 WNS 832 N/A N/A N/A 500-55016,5006/0.10 032 N/A N/A N/A 550-60018,5006/0.10 0420N/A N/A N/A 650-70020,0006/0.10
D
E F I N I U
Test Sheet Material
Type
Thread Cold-rolled Steel 302 Stainless Steel Code Electrode Secondary Weld Electrode Secondary Weld
Ram Force Current Time Ram Force Current Time (N) Amps ±500 Cycles/Sec.(N) Amps ±500 Cycles/Sec.M3 2000-2220 17,000 6/0.10N/A N/A N/A M4 2000-2220 17,000 6/0.10N/A N/A N/A WN
M5 2220-2440 18,000 10/0.17N/A N/A N/A M6 2440-2670 20,000 10/0.17N/A N/A N/A M3 N/A N/A N/A 2000-222016,5006/0.10M4 N/A N/A N/A 2220-244016,5006/0.10
WNS
M5 N/A N/A N/A 2440-267018,5006/0.10M6 N/A N/A N/A 2890-311020,0006/0.10
C
R I T E M
Test Test
T Sheet Material Type Thread
1.5 mm Cold-rolled Steel 1.5 mm 302 Stainless Steel Code Pushout Torque-out Pushout Torque-out (N) (N•m)(N) (N•m) M3 2220 1.4N/A N/A
M4 3380 3.7
N/A N/A WN
M5 3910 6.3N/A N/A M6 4445 20.9N/A N/A M3 N/A N/A 3020 1.4 M4 N/A N/A 3780 5WNS
M5 N/A N/A 4000 12.4 M6 N/A N/A 4445 22.5 C
I R E T M
N/A Not Available.
(1) The pushout and torque-out values reported are averages when all installation
specifications and procedures are followed. Performance testing of this product in your application is recommended. We will be happy to provide samples for this purpo.
N/A Not Available.
(A) is the force exerted by the electrodes on the fastener and sheet to clamp them rce is Electrode Force together and ensure good electrical contact. Electrode force also ts the weld nut down flush on the sheet as the projections melt during the welding period. Insufficient electrode force may result in flashing, spitting, burning, spatter, and discoloration. On the other hand, excessive electrode force may flatten the fastener projections before proper welding temperature is reached or may imbed the projections of the cold fastener into the sheet. Excessive electrode force can also distort threads duri
ng the weld cycle.(B) determines the heat applied to the PEM weld nut and sheet. Heat is in ent det Secondary Current direct proportion to weld time, resistances of the materials, and the square of the current. Current should not be t so high as to cau flashing or spattering or excessive heat which will distort the threads. Low currents may produce good looking welds but pushout and torque-out strengths will not be satisfactory.(C) for projection welding compris four periods. (1) the squeeze time in which cle for Timing Cycle the electrodes move into position and develop the required force; (2) the weld time when the current is
applied; (3) the hold time while the weld congeals and cools; and (4) the off time for positioning the work for the next weld nut.
Specifications subject to change without notice.
Check our website for the most current version of this bulletin.
RoHS compliance information can be found on our website.
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