100c
User Manual
44
ch
.
7
Zinc
Al
uminum
Sil
ve
r
Go
ld
Coppe
r
Pal
ladium*
Cob
al
t
Chr
ome*
St
ainl
ess
304*
Car
bon St
ee
l
Tit
anium
Pl
at
inum
Niobium
Tungs
te
n
Melting Point
420
660
962
1064
1083
1200
1300
1450
1500
1660
1772
2468
3410
Boiling Point
607
2467
2212
3080
2567
3100
2800
3000
3000
3287
3827
4742
5660
Specific Heat
388
900
237
129
385
244
10
500
500
523
129
268
133
Electrical Resistivity
6
2 .7
1 .6
2 .2
10 .6
10 .8
475
70
60
54
10 .6
16
5 .4
Density
7 .1
2 .7
10 .5
19 .3
9
11
8 .3
7 .9
7 .8
4 .5
21 .5
8 .6
19 .3
Thermal Expansion
31
23 .5
19 .1
14 .1
17
11
10
18
12
8 .9
9
7 .2
4 .5
Thermal Conductivity
116
237
429
318
401
71
100
16 .3
50
22
71 .6
54
173
*Some Values may be approximate
Melting Point:
The temperature at which the metal will begin to melt . The molten metal of the
weld pool will be at this temperature during the welding process .
Boiling Point:
If enough energy is added to the weld joint (and heat is removed slowly by the
surrounding solid metal) the weld puddle can begin to boil . Liquid metal will be turned into
gaseous metal .
Specific Heat:
The energy required to raise the temperature of the metal (per unit mass) . Think
of this number as how much metal will melt for a given weld energy (melting point also is
important) . A larger specific heat means more energy is required to melt the metal .
Electrical Resistivity:
This number represents the resistance to the flow of electrons in a
metal . This property is especially important during a resistance or “tack” weld . The more
resistive the metal is the more easily it will resistance weld (e .g . stainless steels), the
smaller this number is the more difficult it will be to weld the material (e .g . silver), especially
in “tack” mode .
Density:
how much of the metal (atoms / mass) is in a given volume of space . This property
will also influence how large the weld spot is for a given metal . All other things being equal,
a lower density metal will have a larger weld spot than a higher density metal for the same
weld energy .
Thermal Expansion:
When a metal is heated it will expand, or elongate slightly . In some
situations, especially during resistance welding, metal can expand quickly and spill out of
the weld joint .
Thermal Conductivity:
This is a measure of how fast the metal conducts heat . Metals that
are good conductors of heat (e .g . copper) will dispel the heat away from the weld location
quickly during the welding process . This action reduces the size of the weld spot . Metals
that are poor conductors of heat (e .g . titanium) are slow to conduct heat away from the weld
location and the weld energy has a greater affect on the weld size, etc .
