Technical reference
Welding technical guides
The questions that come before the purchase order: what temperature an electrode is re-dried at, which filler joins stainless to carbon steel, what interpass temperature duplex allows. Each guide answers one of them with the figure, its source, and the limit beyond which it stops applying.
3 guides · compiled from manufacturer documentation · sources named on every page
-
Welding Electrode Storage, Re-Drying and Handling
Covered welding electrodes absorb atmospheric moisture, and moisture in the coating becomes hydrogen in the weld: ESAB specifies storage below 40 % relative humidity above 25 °C, re-drying for two hours at a temperature between 80 °C and 350 °C depending on the electrode, a maximum of three re-drying cycles, and no re-drying at all for vacuum-packed electrodes while the pack is intact or for cellulosic electrodes at any time.
-
Welding Stainless Steel to Carbon Steel
A joint between stainless and carbon or low-alloy steel is welded with an over-alloyed austenitic consumable such as E309L, or with a nickel-based alloy where the joint will operate above 300 °C, because the molten pool takes metal from both sides and a matching consumable diluted by carbon steel can solidify partly martensitic and crack.
-
Welding Duplex and Super Duplex Stainless Steel
Duplex stainless steel is welded with an over-alloyed matching consumable at a controlled heat input of 5 to 25 kJ/cm, an interpass temperature not exceeding 250 °C for duplex and 150 °C for lean and super duplex, and pure nitrogen backing gas, because the weld metal solidifies fully ferritic and must form roughly half its volume as austenite during cooling to recover the parent material's toughness and corrosion resistance.
Need an answer that is not here?
Send the procedure or the question through the enquiry form or by email. POFIS is an ESAB Authorized Distributor and Service Centre in Abu Dhabi, an approved ADNOC vendor and ISO 9001 certified, and we would rather check a figure against the manufacturer documentation than have you work from a general reference.