| Q. 1 |
What is Metal Recovery & how much
is it for Supratherme (AWS: E7018) ? |
| Ans. |
Metal recovery is the ratio of weight of weld
metal deposited to the weight of core wire melted.
For Supratherme (AWS: E7018) metal recovery is 115%. |
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| Q. 2 |
What do you mean by Touch Electrode
in Medio (AWS: E6013) ? |
| Ans. |
In Chinese / cheaper electrode, usually welder
faces a problem of arc striking or knocking of electrode
before use, where as in Medio (AWS: E6013) can operate
even with 45 OCV (Open Circuit Voltage) that is
a special characteristic of "Touch
& Start welding" without any hassle. |
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| Q. 3 |
What is Hydrogen content & Impact
Strength of Supratherme (AWS: E7018) ? |
| Ans. |
As per AWS standard Supratherme (AWS: E7018) fulfills
H8 level of hydrogen that is hydrogen content less
than 8 ml per 100 gms of weld metal. CVN Impact
strength of Supratherme (AWS: E7018) is 65 Joules
at -30° C. |
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| Q. 4 |
Which is the electrode in D&H
Sécheron brand for welding of any two metals
with unknown chemical composition (unknown dissimilar
metals) ? |
| Ans. |
Lotherme 468 is the most recommended electrode
for above application. |
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|
| Q. 5 |
What is the economics of FCAW compare
/ over SMAW ? |
| Ans. |
FCAW becomes economical over SMAW mainly because
of the very high deposition rates. When cost of
welding is taken in totality, i.e. when we consider
the cost of welder, overheads, power etc. in total
for one kg of weld metal deposited, FCAW works out
very economical. This of course depends upon the
application and the labour overheads of each organization.
Generally, for continuous welding of bulk components
(wherever organized labour is involved), FCAW is
found to be not only economical but also very reliable
in terms of quality. Maxfil 12 R (AWS: E71T1) is
a product of D&H Sécheron. |
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|
| Q. 6 |
What is FN (Ferrite Number) in Stainless
Steel Welding Consumables ? |
| Ans. |
It is the measure of Ferrite phase present in
Austenitic stainless steel. Presence of ferrite
also compensate drawbacks of sulphur, phosphorus
& other impurities in stainless steel. Application
where corrosion resistant is of primary importance,
ferrite number should be minimum. |
