submerged arc welding for corrosion resistant overlayarcspecialties.com/documents/saw process for...
TRANSCRIPT
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50107 – SAW SS CRO - 150107 – SAW SS CRO - 1
Submerged Arc Welding for Corrosion Resistant Overlay
ARC Specialties Applied Automation
Workshop – Submerged Arc Welding
March 5, 2013
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CONTENTS
• How it works –
– The Welding Process
• Welding variables
– Welding current
– Arc voltage
– Travel speed
– Wire size
– Circumferential welds
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PROCESS CHARACTERISTICS
• High deposition rates –
• Fast travel speeds –
• Economic - High deposition rates and high
travel speeds reduce overall costs
• Multiple electrodes - greater versatility
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SAW PROCESS ADVANTAGES
• Simple - mechanized process, easy to train
machine operators
• Clean environment - minimal smoke or fume
• Operator friendly - no visible arc, no spatter
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SAW PROCESS DISADVANTAGES
• Flux handling is necessary - new and used
• Fine flux particles - potential dust problem
• Large molten weld puddle - limits most
welding to the flat position
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HOW IT WORKS
THE SUBMERGED ARC PROCESS
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SAW PROCESS
Flux covers weld zone in front of wire
Heat of the arc melts the wire, flux and plate
Fused flux shapes and protects weld metal
Weld metal
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WELDING POWER SUPPLY
• Supplies electrical power to the electrode - The
heat of the arc melts the electrode and base
plate to form the weld bead.
• Electrical current can be:
– AC or DC
– CV or CC
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DC POWER
• DC power is the most commonly used
– It is the easiest to control
– Gives the best arc starting
– Gives the best arc stability
– DCEP (electrode positive) - used most often, gives
deepest penetration
– DCEN (electrode negative) - gives 20-25% less
penetration and greater deposition, can be used
for some surfacing applications
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AC POWER
• AC power minimizes arc blow problems
– Eliminates arc blow with high current DC
– Eliminates arc blow inside of small diameter pipes
– Used for multi-wire applications - controls arc
interaction between wires
– Not all fluxes are designed to operate with AC
power
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INFLUENCE of POLARITY
• DCEP - Deep penetration
• DCEN - Shallow penetration
• AC - Penetration is in between DCEP and DCEN
DCEP AC DCEN
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AC Sine Wave
AC Balanced Square Wave
AC Variable Polarity
VARIATIONS of AC POWER
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WELDING VARIABLES
� Welding current
� Arc voltage
� Travel speed
� Wire size
� Wire extension
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WELDING CURRENT
• Controls - Deposition rate
– Increase in current - Increases burn-off rate
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WELDING CURRENT
• Controls - Depth of penetration
– Increase in current - Increases penetration
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WELDING CURRENT
Welding Current vs. Penetration
350 AMPS 500 AMPS 650 AMPS
All welds made at 29 volts and 30 IPM
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INFLUENCE of AMPS on PENETRATION
500 amps @ 35 V 600 amps @ 35 V
.256”.336”
20 ipm
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ARC VOLTAGE
• Arc voltage is a - Measure of Arc length
– Increase voltage – Increase bead width
– Increase voltage - Decrease penetration
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ARC VOLTAGE
Welding Voltage vs. Bead Width
22 VOLTS 29 VOLTS 38 VOLTS
All welds made at 500 amps and 30 IPM
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INFLUENCE of VOLTS on PENETRATION
500 amps @ 35 V 500 amps @ 30 V
.256” .273”
20 ipm
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INFLUENCE of VOLTS on PENETRATION
600 amps @ 35 V 600 amps @ 28 V
.336”.427”
20 ipm
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INFLUENCE of AMPS and VOLTS
•Higher amperage gives deeper penetration
•Increased voltage gives wider bead
200 300 400 500 600 AMPS
24 28 32 36 40 VOLTS
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TRAVEL SPEED
• Controls - penetration
– Increase speed – Decreases penetration
– Increased speed – Decreases weld thickness
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TRAVEL SPEED
Travel Speed vs. Bead Width (size)
21 IPM 30 IPM 39 IPM
All welds made at 500 amps and 29 volts
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WIRE SIZE / DEPOSITION RATES
• Current vs. Deposition Rate vs. Wire Size
– Increase current - Increase deposition rate
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WIRE SIZE / BURN�OFF RATES
• Wire Burn-off rates (ipm) vs. Amps
DCEP - 10-15% Less
DCEN - 10-15% More
Electrode Stick-out = 8X wire diameter
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WIRE SIZE / BEAD WIDTH
• Wire Size vs. Bead Width vs. Penetration
– Larger wire size at same welding current - Wider
bead with less penetration
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WIRE SIZE / PENETRATION
• Current Density = amps/A (in.2)
– amps = welding current
– A = cross sectional area of wire (in.2)
5/32” wire
500 amps
A = .0192 in.2
CD = 26,042 amps/in.2
500 amps
1/8” wire
A = .0123 in.2
CD = 40,650 amps/in.2
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WIRE SIZE / PENETRATION• Wire size vs Penetration
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
450 AMPS
500 AMPS
550 AMPS
600 AMPS
3/32” 1/8” 5/32”
PE
NE
TR
AT
ION
-in
.
WIRE SIZE
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CURRENT DENSITY vs. PENETRATION
• At the same current level, a smaller wire will give
deeper penetration due to higher current
density
d = 4mm (5/32) 3.2mm (1/8) 2.5mm (3/32) 2. 0mm 3. 0mm
400 AMPS
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WIRE STICK�OUT
• Wire stick-out should be about 8 times the wire
diameter (1/8” wire = 1” )
• “Electrical Stick-Out” - Tip-to-work distance
Stick-out
Work
Tip
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ESO vs. PENETRATION
• Longer stick-out - Decreases penetration (at
the same wire feed speed)
Penetration vs. Stick-out
1” 1 3/4” 2 3/8” 3”
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WIRE ALIGNMENT � CIRCUMFERENTIAL
• Proper alignment for circumferential welds
Wire is always ahead of center -Puddle should solidify at center
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OFFSET ON CIRCUMFERENTIAL WELDS
• Molten puddle runs off top of round seam
Metal runs over top away from arc
Metal runs back under arc
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THE END