Standard Flame Hardening Heads

 

WATER COOLED HEADS TO FIT WELD TIP GOOSENECKS

Water is circulated through the head for cooling purposes only. Quenching of the work piece just come from another source. Internal threads are provided at the back of each head for mounting purposes.

FUEL GAS INLET IS 1/4" NPT - WATER INLET IS 1/8" NPT (NOTE: To mount of a Weld Tip gooseneck use WT-UAD-10 adapter)

 

 Item Number Width Of Heating Capability Head Size Number of Flame Ports Flow (CFH) Oxygen Flow (CFH) Fuel
WT-WC 10
WT-WC 15
WT-WC 20
WT-WC 25
WT-WC 30
WT-WC 35
WT-WC 40
 
1"
1 1/2"
2"
2 1/2"
3"
3 1/2"
4"
 
1 X 2 X 1 3/4"
1 X 2 X 2 1/4"
1 X 2 X 2 3/4"
1 X 2 X 3 1/4"
1 X 2 X 3 3/4"
1 X 2 X 4 1/4"
1 X 2 X 4 3/4"
 
23
35
47
59
71
83
95
 
130-155
200-235
270-315
340-400
400-475
475-560
550-640
 
35-50
50-80
70-110
80-135
110-165
125-190
140-220

 

WATER-QUENCHING HEADS TO FIT WELD TIP GOOSENECKS

Water is provided to quench the work piece as well as cooling the head. Internal threads are provided at the back and at each side of the head for mounting purposes.

 

FUEL GAS INLET IS 1/4" NPT - WATER INLET IS 1/8" NPT

(NOTE: To mount on a Weld Tip Gooseneck use WT-UAD-10 adapter)

 

 Item Number Width Of Heating Capability Head Size Number of Flame Ports Flow (CFH) Oxygen Flow (CFH) Fuel
WT-WQ 10
WT-WQ 15
WT-WQ 20
WT-WQ 25
WT-WQ 30
WT-WQ 35
WT-WQ 40
 
1"
1 1/2"
2"
2 1/2"
3"
3 1/2"
4"
 
1 X 2 X 1 3/4"
1 X 2 X 2 1/4"
1 X 2 X 2 3/4"
1 X 2 X 3 1/4"
1 X 2 X 3 3/4"
1 X 2 X 4 1/4"
1 X 2 X 4 3/4"
 
23
35
47
59
71
83
95
 
130-155
200-235
270-315
340-400
400-475
475-560
550-640
 
35-50
50-80
70-110
80-135
110-165
125-190
140-220

NON-STANDARD FLAME HARDENING HEADS

Non-standard heads for any flame hardening application and gas are quoted on an individual basis. Submit customer drawing and specifications of head and/or work place to be hardened. Weld Tip will provide assistance to those requiring customized flame hardening heads.

 

HOW FLAME HARDENING WORKS

 

Flame hardening includes any process that uses an oxy-fuel gas slame to heat carbon or alloy steel, tool steel, cast iron or a hardenable stainless steel above a certain "critical" temperature. A rapid quench follows, causing the material to harden to some depth below its surface.

 

Flame hardening differs from other heat treating processes because only the surface, and a thin layer of the workpiece below the surface, are hardened. Induction hardening is used because equipment and maintenance costs are lower. Operating costs are about the same for both methods depending on the size of the production run and workpiece configuration. Flame hardening is also more versatile than induction hardening.

 

FLAME HARDENING

Flame hardening is a rapid, economical method for selectively hardening specific areas on the surface of a part. The process is applied only to flame-hardenable materials, principally carbon and alloy steels, certain stainless steels and cast irons.

 

Some reasons for selecting flame hardening are:

Parts are too large for conventional furnace heating and quenching. Typical examples include large gears, machine-ways, large dies and mill rolls.

 

Only a small segment of a workpiece requires heat treatment, because heating the entire part would be detrimental.

 

Flame hardening is used to harden parts to depths of 1/64 to 1/4". The success of any flame hardening process depends on several variables, including the type of iron or steel selected, the fuel, the design and operation of the flame head, the quenching medium and how it's used.

 

QUENCHING

Cooling speed during quenching depends on the type and temperature of quenching medium used, and how quickly it is agitated. Self-quenching is the slowest method and produces the lowest surface hardness. Self-quenching occurs when a part has a sufficiently large, cool mass to draw heat away from the surface, causing the part to quench itself.

 

Forced air is a mild quenchant that rapidly cools the workpiece with minimal risk of surface cracking, especially in higher-carbon steels.

 

Oil and soluble oil mixtures give relatively high hardness without too severe cooling rate. Water is a severe quenchant, and brine is an even more severe quenchant. They produce high hardness, but also may cause surface cracking if not used carefully. Water gives a higher hardness than oil where surface cracking is not likely to be a problem (as it is in very high carbon steels).