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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Made this welding table from 2" plate
On 5/1/2017 9:46 PM, Ignoramus445 wrote:
On 2017-05-01, wrote: On Sunday, April 30, 2017 at 11:17:24 PM UTC-4, wrote: Table weighs over 2 tons. Imagine if it had a cement table-top. Many years ago a company where I worked made some 4 by 8 feet concrete table tops. We picked some smooth places on the concrete floor and put down Visqueen so the fresh concrete would not bond to the floor. Formed up the mold and put in rebar. The tables worked well. No warping. Probably would not work well for a welding table. Cement can spall due to high heat and that is a hazard. i Portland cement that is. a.k.a. "normal cement". Refractory Cement I used is a Non-water based cement. It starts with water and chemically reacts, gets hot and boils most off. It is a Hard and flame / furnace good to 3800 degrees F. I use a forced air (no fan) but Venturi torch with propane to drive the furnace. It is heavier than the water borne Portland mix. Martin |
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#2
Posted to rec.crafts.metalworking
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Made this welding table from 2" plate
"Martin E" wrote in message
... On 5/1/2017 9:46 PM, Ignoramus445 wrote: On 2017-05-01, wrote: On Sunday, April 30, 2017 at 11:17:24 PM UTC-4, wrote: Table weighs over 2 tons. Imagine if it had a cement table-top. Many years ago a company where I worked made some 4 by 8 feet concrete table tops. We picked some smooth places on the concrete floor and put down Visqueen so the fresh concrete would not bond to the floor. Formed up the mold and put in rebar. The tables worked well. No warping. Probably would not work well for a welding table. Cement can spall due to high heat and that is a hazard. i Portland cement that is. a.k.a. "normal cement". Refractory Cement I used is a Non-water based cement. It starts with water and chemically reacts, gets hot and boils most off. It is a Hard and flame / furnace good to 3800 degrees F. I use a forced air (no fan) but Venturi torch with propane to drive the furnace. It is heavier than the water borne Portland mix. Martin I sometimes weld on firebricks. They withstand the heat well enough but spatter sticks and removing it degrades the surface. They are fine for occasional hobby use and since I store them under the wood stove they don't take up valuable storage space. -jsw |
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#3
Posted to rec.crafts.metalworking
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Made this welding table from 2" plate
On 5/3/2017 5:45 AM, Jim Wilkins wrote:
"Martin E" wrote in message ... On 5/1/2017 9:46 PM, Ignoramus445 wrote: On 2017-05-01, wrote: On Sunday, April 30, 2017 at 11:17:24 PM UTC-4, wrote: Table weighs over 2 tons. Imagine if it had a cement table-top. Many years ago a company where I worked made some 4 by 8 feet concrete table tops. We picked some smooth places on the concrete floor and put down Visqueen so the fresh concrete would not bond to the floor. Formed up the mold and put in rebar. The tables worked well. No warping. Probably would not work well for a welding table. Cement can spall due to high heat and that is a hazard. i Portland cement that is. a.k.a. "normal cement". Refractory Cement I used is a Non-water based cement. It starts with water and chemically reacts, gets hot and boils most off. It is a Hard and flame / furnace good to 3800 degrees F. I use a forced air (no fan) but Venturi torch with propane to drive the furnace. It is heavier than the water borne Portland mix. Martin I sometimes weld on firebricks. They withstand the heat well enough but spatter sticks and removing it degrades the surface. They are fine for occasional hobby use and since I store them under the wood stove they don't take up valuable storage space. -jsw Those are a pink/tan foam based refractory. Wood stoves use them also. They make sacks of material using Alumina that hot temp Pottery places use and it will give you better service. Then there is my rock based process and there is another that is even higher temp. I had some 'extra' mixed up and poured them into small tin foil (Al really) that the wife had - created 6x6" 2" high temp 'bricks with a wave bottom - holds work in the air on the ribs and the brick takes the heat and heats from underneath as well. Martin |
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