Valley FABRICATOR 251, Руководство по обслуживанию

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August 22, 2008 4-13
SERVICE MANUAL FABRICATOR 251
4.09 Gas Selection for Gas Metal Arc Welding
Metal Type
Base Plate
Thickness
Filler
Metal
Transfer
Mode
Suggested
Shielding
Gas
Welding
Positions
Comments
G r eate r than 22
gauge (.030”)
ER70S-X Sho r t
Ci r cuit
100% CO
2
All
Position
Welding
High welding speeds. Good
penet
r ation and pool cont r ol.
G r eate r than 22
gauge (.030”)
ER70S-X Sho r t
Ci r cuit
75% A r gon
25% CO2
All
Position
Welding
Suitable fo r high-cu rr ent and high-
speed welding.
G r eate r than 22
gauge (.030”)
ER70S-X Sho r t
Ci r cuit
92% A r gon
8% CO2
All
Position
Welding
Highe r deposition r ates without melt-
th r ough. Minimum disto r tion and
spatte r . Good pool cont r ol fo r out-of-
position welding.
G r eate r than 10
gauge (1/8”)
ER70S-X Sp r ay
T r ansfe r
92% A r gon
8% CO2 o r
minimum
80% A r gon
20% O2
Flat & HV
Fillet
Good a r c stability, weld soundness,
and inc r easing width of fusion.
G r eate r than 22
gauge (.030”)
See * below Sho r t
Ci r cuit
Globula r
75% A r gon
25% CO2
All
Position
Welding
High welding speeds. Good
penet
r ation and pool cont r ol.
Applicable fo r out-of-position welds.
Suitable fo r high-cu rr ent and high-
speed welding.
G r eate r than 22
gauge (.030”)
See * below Sho r t
Ci r cuit
92% A r gon
8% CO2
All
Position
Welding
Good coalescence and bead contou r .
Good mechanical p r ope r ties.
G r eate r than
3/32”
See * below Sp r ay
t r ansfe r
92% A r gon
8% CO2 o r
minimum
80% A r gon
20% O2
Flat & HV
Fillet
Reduces unde r cutting. Highe r
deposition r ates and imp r oved bead
wetting. Deep penet r ation and good
mechanical p r ope r ties.
G r eate r than 14
gauge (.075”)
See * below Sho r t
Ci r cuit
98% A r gon
2% CO2
All
Position
Welding
Good cont r ol of melt-th r ough and
disto r tion. Used also fo r sp r ay a r c
welding. Pool fluidity sometimes
sluggish depending on the base alloy.
G r eate r than 22
gauge (.030”)
ER308-X
ER309-X
ER316-X Sho r t
Ci r cuit
90% Helium
7.5% A r gon
2.5% CO2 o r
81% A r gon
18% Helium
1 % CO2
All
Position
Welding
Low CO
2
pe r centages in Helium mix
minimizes ca r bon pickup, which can
cause inte r g r anula r co rr osion with
some alloys. Helium imp r oves wetting
action and contou r . CO
2
pe r centages
above 5% should be used with
caution on some alloys.
G r eate r than
3/32”
ER308-X
ER309-X
ER316-X Sp r ay
T r ansfe r
90% Helium
7.5% A r gon
2.5% CO2 o r
81% A r gon
18% Helium
1 % CO2
Flat & HV
Fillet
Good a r c stability. P r oduces a fluid
but cont r ollable weld pool, good
coalescence, and bead contou r .
Minimizes unde r cutting on heavie r
thickness.
Aluminum G r eate r than 18
gauge (.045”)
ER4043
ER5356 Sp r ay
T r ansfe r
A r gon All
Position
Welding
Excellent cleaning action. P r ovides
mo r e stable a r c than helium- r ich
mixtu r es.
* Contact you r Fille r Metal Supplie r fo r r ecommended fille r metal fo r the base metal to be welded.
Stainless
Steel
Carbon
Steel
Low Alloy
and High
Alloy Steel
Table 4-5: Gas Selection Cha r t