Technical notes of interest to Marine Engineers

A quick reference for welding

Compiled by: Martin Leduc - 2004

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6010

bulletAll positions bulletDeep penetration  bulletDC reverse polarity bulletRod is mild steel bulletApplication use medium arc, whipping or weaving on vertical and overhead to control bead sag.

 

Diameter

Flat amps

Vertical amps

Overhead amps

3/32

50 90

50 90

50 90

1/8

90 140

90 130

90 130

5/32

120 180

130 150

130 160

3/16

150 - 230

140 - 270

140 - 180

 

6011 (blue spot)

bulletAll positions bulletGood penetration  bulletAC or DC reverse polarity bulletRod is mild steel bulletApplication stringer beads for overhead fillet, weaving for vertical and horizontal fillets.

Diameter

Flat amps

Vertical amps

Overhead amps

3/32

50 75

50 75

50 75

1/8

90 140

80 110

80 130

5/32

110 160

120 145

120 150

3/16

160 195

160 180

140 - 180

7/32

190 250

 

 

1/4

200 - 300

 

 

  

7018 

bulletAll positions bulletAC or DC reverse polarity bulletIron in coating good with AC and allows high current settings bullet Application use highest current practical in range, use straightforward progression and short arc, weld puddle very fluid.

Diameter

Flat amps

Vertical amps

Overhead amps

3/32

65 100

65 90

80 100

1/8

120 150

100 130

120 150

5/32

150 210

120 160

150 210

3/16

240 -280

180 - 220

240 - 280

 

7024

bulletHigh speed down hand or horizontal bulletAC or DC straight polarity bulletBest for horizontal and flat welding bullet Application use drag method or open arc (keep arc short), weaving may be used.

Diameter

Minimum amps

Maximum amps

Best amps

3/32

80

125

110

1/8

140

180

170

5/32

185

250

250

 

316ELC16

bulletStainless, NiCr for welding 316EL & 317 Stainless steels bulletUse for high heat applications i.e. Exhaust bellows bulletAC or DC reverse polarity bullet Application any position, vertical weld up.

Diameter

Flat amps

Vertical amps

Overhead amps

1/16

20-35

15 25

20 30

5/64

30 50

25 35

30 40

3/32

40 70

35 50

40 60

1/8

65 - 100

55 - 70

60 85

 

 1851

bulletFor brass, bronze, copper and joining dissimilar metals bulletMaterial must be clean bulletCopper alloys must be pre-heated bullet Application all positions, vertical weld up.

Diameter

Flat/overhead amps

 Vertical amps

 

3/32

100 120

40 60

 

1/8

125 160

65 -100

 

5/32

150 - 200

80 -120

 

 

Some other tips...

MIG welding

To get deeper penetration you do this (in order of usefulness): 
Increase wirespeed, decrease stickout, drag the torch, switch to straight CO2, use skinnier wire. 

To get shallower penetration you do this (in order of usefulness): 
Reduce wirespeed, increase stickout, push the torch, switch to argon/CO2 mix, use thicker wire. 

To get a larger bead you do this (in order of usefulness): 
Increase wirespeed, decrease travel speed, increase stickout. 

To get a smaller bead you do this (in order of usefulness): 
Decrease wirespeed, increase travel speed, decrease stickout. 

To get a higher, narrower (colder) bead you do this (in order of usefulness): Decrease voltage, drag torch, increase stickout. 

To get a flatter, wider (hotter) bead you do this (in order of usefulness): Increase voltage, Push torch, Decrease stickout.

To get a faster deposition rate you do this (in order of usefulness): 
Increase wirespeed, increase stickout, use smaller wire. 

To get a slower deposition rate you do this (in order of usefulness): 
Decrease wirespeed, decrease stickout, use larger wire.  

Note that when you change the stickout you change the current, so you might need to adjust the wirespeed to compensate. Same with changing wire size, obviously.