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In this video I show how to make the San'mai knife "easiest in the world", and it is easier because it is a knife without welding, without being forged, as is commonly done. In this video I coated a spring steel plate with the "inox E 308L-17" welding electrode. The test was successful at first, but for the next one we will use electrode E 309L-17 in plain carbon steel only. Overlay welding was done with inverter and lower current (little penetration). 7 2.5 mm electrode rods at 65 A were used.
Forging forming did not need to reach melting temperature.
Below is some information about the stainless steel electrode and also about welding in medium and high carbon steels:
Electrode E308L-17
The E308L-17 electrode is an extra low carbon (C 0.04%) stainless steel electrode that deposits grade 19/10 stainless steel (19 Cr 10 Ni). It is an electrode suitable for welding similar steels. It can also be used in welding air-hardened steels, martensitic and ferritic steels.
Some application examples are: welding of tanks, turbines, shafts, pumps, equipment in the food, chemical, textile, pharmaceutical, environmental control, hospital, sanitation and heat treatment areas.
Electrode E309L-17
The Coated Electrode E309L-17 was developed for "welding", which is nothing more than welding stainless steel AISI 304-304L to carbon steel. Basically, this electrode is indicated for welding dissimilar steels and stainless steels of similar composition. It also has a low carbon content (C 0.04) in its composition
Some application examples are: welding of stainless coatings on carbon steel (resistant to heat and corrosion), vessels, containers, tanks, muffles, grids, heat treatment boxes, chemical bath equipment, tools, continuous furnaces and others.
Welding in medium and high carbon steels:
Medium Carbon Steel
These steels include the AISI series between C-1030 and C-1050. The composition is similar to that of low carbon steels, except for the carbon content between 0.3 and 0.5% and the manganese content between 0.6 and 1.65%. Due to the higher carbon and manganese content, low hydrogen electrodes are recommended, particularly for thicker parts. Preheating between 150 and 260ºC may be necessary. Post-heating is sometimes recommended to relieve residual stresses and reduce hardness that can be caused by rapid cooling after soldering. Medium carbon steels can easily be welded by the same processes used for low carbon steels provided the above precautions are observed.
High Carbon Steel
These steels include the AISI series between C-1050 and C-1095. The composition is similar to the previous steels, except for the carbon content between 0.5 and 1.03% and the Mn content between 0.3 and 1.0%. The welding of these steels requires special care. Low hydrogen electrodes/processes need to be used with a preheat between 200 and 320°C, especially for heavier parts. A heat treatment after welding (stress relief or even annealing) is usually specified. The same welding processes can be used for these steels.
*Source: FEDERAL UNIVERSITY OF MINAS GERAIS Department of Metallurgical and Materials Engineering. Prof. Paulo J. Modenesi
**Full article:
file:///C:/Users/USUARIO/Downloads/soldabilidade%20(1).pdf
If you've read this far, comment: long live the gambiarra!
Hope you enjoyed the video!
Strong hug!
Execution: Alexandre Bigunas
Recording, editing, music and thumbnail art: Alisson G. Bigunas