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21A

 

STUDWELDING TECHNIQUES 

20 

5. WELDING STUDS LESS THAN 25 mm LONG USING FERRULES. 
As we have seen previously, the stud is held in a recess in the chuck and must be long 

enough to allow us to set the correct protrusion. A standard chuck has a recess 12 mm 
deep and ferrules vary in length up to 13.5 mm high. Thus if a stud is much less than 25 
mm LAW we shall not be able to obtain the correct protrusion, i.e.. The chuck may hit the 
ferrule on the return stroke and prevent the stud returning to the plate correctly. 

This problem may be overcome by using "shallow recess" chucks (the recess depth is only 
6 mm) or if the studs are required to be very short, by using a special type of stud known 
as a "break-off" type. These studs have an overall LAW of 30 mm and are welded using a 
standard chuck and ferrule. The stud is "grooved" at the required length from the welding 

end. After welding, the surplus portion of the stud is broken off with a pair of pliers. By 
these means, very short studs can easily be welded. 
 

6. USING TEMPLATES TO ENSURE POSITIONAL ACCURACY. 
When welding studs around the periphery of a flange, i.e. for cover plates, inspection 
doors etc., positioning of the studs in relation to each other becomes most important. A 
simple template made from 2 mm sheet, shaped to suit the component and provided with 

clamps is usually the answer to this problem. The position of the studs is accurately 
marked and holes drilled in these positions to accept either the ferrule of the stud to be 
welded or, if using short cycle, the pistol gas shroud. The size of the holes should be the 

outside diameter of the ferrule / 0.4 mm. It is also advisable to provide 2 mm 
thick pads underneath the template so that there is a space between the component and 
template, this space will allow the gases developed during welding to vent properly from 
the ferrule / shroud. For any further advice or help in the design of jigging or templates 

contact your local field sales engineer. 
 
7. MINIMUM PLATE THICKNESSES WHEN STUD WELDING. 

When using standard Drawn Arc with ceramic ferrules, the minimum ratio of stud diameter 
to plate thickness is 4 : 1 for plate thickness greater than 3 mm and 3 : 1 for plate 
thickness between 1.5 mm and 3 mm. When using the short cycle system with or without 
gas purging it is possible to weld equivalent size studs onto slightly thinner sections, due 

to the short weld duration. These ratios ensure that the strength of the plate is sufficient to 
support a stud of a given size when it is loaded, without there being a tendency for the 
plate to distort. 

Occasionally, however, it may be necessary to weld a stud outside of these ratios. This 
can sometimes be accomplished without distortion by "heat sinking" the component, by 
using a flat copper or water cooled backing piece behind the weld area, to support the 
plate and assist in dissipating heat quickly. 

 
8. WELDING STAINLESS STEEL. 
Austenitic stainless steel studs of the 18/8 g/N : weld decay proof type can be supplied for 
welding to similar parent material or mild steel. The technique does not differ from that 

used for mild steel stud welding. There is a tendency with larger diameters of stainless 
steel studs for metal transfer across the arc to take the form of large particles. If short 
circuits occur then the arc can be heard to splutter. This may occur with any diameter of 

stainless steel stud if the lift of the hand tool is not correct. Due to this tendency to transfer 
in large particles increased lift may be required and time settings should be kept as low as 
possible. 

Summary of Contents for 800DA

Page 1: ...V 21A OPERATING GUIDE FOR TYPE 800DA DRAWN ARC CONTROLLER TAYLOR STUDWELDING SYSTEMS LIMITED...

Page 2: ...WELDING 8 GUIDE TO EXTERNAL FEATURES 11 SETTING UP AND WELDING 14 WELDING TIME AND CURRENT SETTINGS 15 VISUAL WELD INSPECTION 16 WELD TESTING 19 STUDWELDING TECHNIQUES 22 PARTS LIST EXPLODED DIAGRAMS...

Page 3: ...1924 487701 You may wish to record the details of your controller below as this information will help with any technical assistance you may require PURPOSE AND CONTENT OF THIS GUIDE This guide has bee...

Page 4: ...m regarding the safety of the machine PLEASE READ THIS GUIDE CAREFULLY BEFORE INSTALLING OR OPERATING THE CONTROLLER PLEASE OBSERVE CAREFULLY ALL SAFETY PROCEDURES INSTRUCTIONS DUE TO THE POWER REQUIR...

Page 5: ...nnel working in close proximity must wear suitable eye ear and body protection Fumes and gases can seriously harm your health Use the equipment only in a suitably ventilated area If ventilation is ina...

Page 6: ...t is able to support the weight of the equipment and that it will not fall or cause a danger in the course of its normal operation Do not hang connecting cables over sharp edges and do not install con...

Page 7: ...ay from the work piece simultaneously striking an arc between the two Both the tip of the weld stud and the surface of the work piece melt as the arc is sustained for a pre determined interval At the...

Page 8: ...ARRYING HANDLE 2 MAINS ON OFF SWITCH 3 VENTILLATION HOLES DO NOT OBSTRUCT 4 WELDING EARTH CONNECTION SOCKET 5 CONTROL PANEL SEE PAGE 9 6 SHIELDING GAS OUTLET SOCKET 7 PISTOL CONTROL CONNECTION SOCKET...

Page 9: ...WINDOW 4 PISTOL TRIGGER ACTUATED INDICATOR YELLOW 5 ADJUSTER KNOB 6 GAS PURGE TIME SETTING PUSHBUTTON 7 GAS FLOWING INDICATOR GREEN 8 STUD TO WORKPIECE CONTACT INDICATOR YELLOW 9 PISTOL LIFT COIL ENE...

Page 10: ...V 21A GUIDE TO EXTERNAL FEATURES 10 BACK PANEL 1 RATING SERIAL PLATE 2 SHIELDING GAS INLET 3 3 Ph MAINS CABLE INLET GLAND 4 VENTILLATION GRILLE DO NOT OBSTRUCT 1 3 2 4...

Page 11: ...ent arc blow when welding takes place Prior to fitting the clamps ensure that the contact area of the work piece is free from rust paint grease etc as this will result in a poor welding connection Plu...

Page 12: ...e on page 9 set the controller by following these simple steps SETTING WELD TIME 1 Press and hold the welding time setting pushbutton 1 2 Turn the adjuster knob 5 until the required time is displayed...

Page 13: ...t 2 Pistol lifts stud 3 Pilot Arc strikes 4 Main Arc strikes melting both stud and workpiece 5 Arc stops Pistol plunges stud into molten pool 6 Weld complete Having welded the stud draw the pistol ver...

Page 14: ...tandard DA7 A pistol with SC studs manufactured to standard BS EN ISO 13918 and mild steel grade CR4 and were performed using a shielding gas purge Argoshield Light at 5l min The settings are given on...

Page 15: ...oblems and how to remedy them EXAMPLE 1 PROBLEM Insufficient heat causing the L A W to be too long and the fillet to be underdeveloped and or incomplete REMEDY Increase the welding time see page 12 EX...

Page 16: ...oportion to the degree of plate contamination Welding close to some magnetic obstruction may produce uneven fillet distribution Too much power will produce a fillet that flows too easily and is lost e...

Page 17: ...finish and lubricity of threads and bearing areas of fastened parts For standard steel screws it is 0 19 to 0 25 and 0 13 to 0 17 for plated screws Anti seize materials and lubricants can lower k to...

Page 18: ...2 6 3 4 1 3 3 M6 x 1 0 8 2 6 7 5 3 10 6 6 9 5 5 M8 x 1 25 20 7 16 8 13 4 26 7 17 3 13 8 M10 x 1 5 40 5 32 8 26 2 52 1 33 8 27 0 M12 x 1 75 71 0 57 5 46 0 91 3 59 2 47 4 M16 x 2 0 181 0 146 5 117 2 23...

Page 19: ...satisfactory weld settings in the down hand position before making attempts in the overhead position Since the weld metal is transferred from stud to plate in small particles in the down hand position...

Page 20: ...s underneath the template so that there is a space between the component and template this space will allow the gases developed during welding to vent properly from the ferrule shroud For any further...

Page 21: ...results cannot be obtained our field staff will be pleased to advise you Check that no other fault is present by welding a few studs on to a test piece and inspecting the fillet formation before decid...

Page 22: ...21A PARTS LIST EXPLODED DIAGRAM 22 1 2 3 SEE PAGE 23 FOR BREAKDOWN OF CONTROLLER ITEM No OFF PART No DESCRIPTION 1 2 81 113 013 COVER STICKER 2 1 81 113 004 HOUSING COVER 3 1 81 120 032 CARRYING HANDL...

Page 23: ...E PAGE 27 A BREAKDOWN OF THE FOR BREAKDOWN FRONT PANEL OF CONTROL DECK SEE PAGE 28 FOR BREAKDOWN OF BACK PANEL 1 2 SEE PAGE 26 FOR BREAKDOWN OF TRANSFORMER CRADLE ITEM No OFF PART No DESCRIPTION 1 1 8...

Page 24: ...1 81 113 009 PANEL OVERLAY 3 1 81 113 007 HOUSING FRONT PANEL 4 1 81 113 020 PILOT ARC RESISTOR 5 1 81 113 015 HANDLE BRACKET 6 1 70 102 025 CONTROL SOCKET 7 2 81 106 031 WELD SOCKET 8 1 PFX CSS B06 B...

Page 25: ...81 104 032 KNOB CAP 3 1 81 113 026 PCB 4 1 70 102 047 THYRISTOR CLAMP 5 1 70 102 046 THYRISTOR 6 1 81 113 019 THYRISTOR MOUNTING PLATE 7 1 70 106 044 THYRISTOR CLAMP PLATE 8 1 81 113 017 EARTH SOCKET...

Page 26: ...ST EXPLODED DIAGRAM 26 1 2 3 ITEM No OFF PART No DESCRIPTION 1 1 81 113 001 WELDING TRANSFORMER 2 2 Z450 06 165 M6 x 165 STUD 3 1 81 113 008 TRANSFORMER CRADLE 4 1 81 113 023 WIRING HARNESS COMPLETE N...

Page 27: ...8 103 052 HAZARD WARNING LABEL 5 1 81 106 262 EARTH LABEL 6 2 81 113 029 VARISTOR 7 2 81 113 028 SOLID STATE RELAY 8 1 81 113 027 HEATSINK 9 3 81 106 044 TERMINAL 10 1 81 106 116 TERMINAL END COVER 11...

Page 28: ...15 HANDLE BRACKET 2 1 81 113 005 BACK PANEL 3 1 81 108 019 CABLE GLAND 4 1 81 106 174 SERIAL LABEL 5 1 PFX CSS B06 BUL GAS INLET SOCKET 6 1 70 102 010 FAN 7 1 70 102 018 FAN FINGER GUARD 8 3 5 71 300...

Page 29: ...V 21A CIRCUIT SCHEMATIC WIRING 29...

Page 30: ...V 21A CIRCUIT SCHEMATIC PCB 30...

Page 31: ...A pair of ca bles comprises 2 off the standard cable assembly part number listed below STANDARD EARTH CABLE ASSEMBLY FOR SYSTEM 800 99 101 046 Spare parts for the maintenance of earth cables are list...

Page 32: ...Compatibility Directive The above mentioned products conform to the following European standards EN 60974 1 2012 ARC WELDING EQUIPMENT PART 1 WELDING POWER SOURCES EN60974 10 2014 ARC WELDING EQUIPMEN...

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