By Steve Thompson
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Additional resources for Handbook of Mold, Tool and Die Repair Welding (Welding & Metallurgy)
Sample text
G. 1 below. 98,9 8,9 see page 47 see page 47 7, 6 , 8 or 9 9 , modified 420 stainless steel; 8, 312 stainless steel, 9,lnconel 625type. 2. 2 are discussed in more detail: general color match, acid/photo etch, cheapest filler, hardness (HRC) and buttedcrack repair. g. if the toolmaker makes a mistake on a new tool and needs to make a weld repair and they do not want the customer to know about it). g. 4%, making it much softer after hardening. If you need an exact match and there is no matching filler wire available, cut a piece of parent metal into matchsticks as described in Chapter 6, page 101.
The natural reaction to this is to keep turning up your amps until you get a molten pool. g. tungsten disintegrating and an inability to feed the filler wire into the pool because your arc is too ferocious. To counteract this, you need to pre-heat the base material to reduce the amount of heat loss from the pool. When pre-heating aluminum, it is very important to stay below 180°C 56 Handbook of mold, tool and die repair welding because the aluminum will start to lose its original properties if held at elevated temperatures and tool aluminum would become soft.
To slow cool your tool after welding, bury it in sand or vermiculite - both materials are readily available from your local buiIder. Because of the number of tool steels available, each having many different names, it is impossibleto list every one and its pre-heat temperature. 2 gives a general guide towards pre-heats based on the tool’s carbon content. To help you determine the carbon content, turn to Chapter 3. Tools that are 60 HRC and above should have a minimum pre-heat of 350°C. Hardened and tempered high speed tool steels should have a minimum pre-heat of 400°C and tempering after welding for one to two hours at 54O-55O0C, then slow cool.