This article will guide the right welding rods for structured welding of thin and thick steel plates, for instance; construction of ships, railways or vehicles which make from mild steel. Noticeable point is resistance to moistness. Varnish of Low quality steel will be removed easily when it exposes to water or moistness. Good quality steel is able to heat and use it again after exposing to moistness, moreover; it must be less smoke and there should have Thai ISO logo 49-2528 and international ISO certification (JIS D4313, AWS A5.1 E6013, and TIS E43 OR11). Price must not be over the average of 48 baht/kg. (2009). It must be able to weld well in the vertical. Surface of butt weld must be smooth and shiny. Flexibility of heat welding rod is + not over 10 % during welding is stopped. Good quality of steel makes art work smoothly and less fire splash. Slack of steel, which is easy to spall and no fracture after welding, is for welding work of small and medium structure work.
Be careful the copied products. Although prices are lower, standard is also lower. Its size and color will be obviously different from the standard ones. Moreover; welding period is able to tell if its quality is low.

Tips for the proper usability
1.) Electric current to link shouldn’t be over the average range (table below or on the label package) because capability of X-ray check will be reduced if level of electric current is insufficient and too much fire splash influences edge biting. Additionally, the strength of steel might be reduced if Steel screening is insufficient.
2.) In order to get the optimal result, welding rod should be heated before use at the temperature of 70-100C about 30-60 minutes because the properties to use would be reduced and there might be some bubbles on butt weld if welding rod get too much absorb.
3) Technicians must be professional on welding or trained by experts.

Generally chemical mix of welding rod texture (%)

Generally mechanical properties of welding rod texture

On-sale size and recommended electric current (AC, DC-EP or DC-EN)

Thank you for information from Eastern Kobe Co., Ltd.