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Hem » FAQ

Answer: The method is the same where a wire electrode (solid wire) or a tubular electrode (FCW/MCW) is fed to a welding torch. Here, an electric arc is established between the wire and the base material, which is protected by a shielding gas. In MIG welding, an inert, inactive gas is used that only protects the fusion pole from oxidizing and does not react with the melt. The method is used when welding stainless steel, nickel steel, aluminium and copper. In MAG welding, an active gas is instead used for welding unalloyed and low-alloyed steel, where the gas reacts with the melt to provide a stable process.

Answer: First choice is to use AlMg4.5Mn (5183). AlMg5 (5356) is also widely used and the choice of alloy depends on what base material you are going to weld. Here you can read more about which alloy to use https://www.meltolit.com/media/56535/aluminium-alloys-selection-chart-meltolit.pdf

Answer: Use a filler metal with high ductility that is insensitive to the high carbon content of the cast iron. Then the filler metal will instead remove much of the residual stresses that arise. Pure nickel or ferro-nickel is recommended. Most often, pure nickel 99% (61 XT, XM, XE) is used for root beads and where you want a material that is easy to machine after welding. Ferro-nickel (55 XT, XM, XE) is used for the last beads to get a stronger joint and also when you weld cast iron to iron. An absolutely forbidden move is to use unalloyed or stainless filler metals as this creates a very brittle weld. Please read more about welding cast iron here https://www.meltolit.com/media/60137/cast-iron-welding-eng.pdf

Answer: This depends on which Hardox steel you are going to weld. Up to Hardox 550 it is recommended to us unalloyed filler metals but for Hardox 600 or Hardox extreme you need to use 307 which is a stainless austenitic alloy. It is available for all welding methods MMA, TIG, MIG, FCW, MCW, SAW. See our recommendations for SSAB steel https://www.meltolit.com/media/56538/meltolit-selection-guide-ssab-steels.pdf

Answer: You must use a low-alloyed filler metal that we call Corten. This contains levels of chromium, nickel and copper to make it corrosion resistant. It is available as MAG wire, TIG wire, FCW and electrodes.

Answer: Yes there are several types of solders for this. Tin solder (230Al) with a low melting range between 230-250°C that is used with a torch or a soldering iron. Common for roofing work etc. Zinc/aluminum solder (7822/Al-2) widely used in the repair of radiators, aluminum piping, etc. Melting range between 415-475°C Aluminum solder (580) with a melting range between 575-585°C. Used for heat exchangers, pipe systems, AC systems for cars, coolers etc.

Answer: To remove the oxide layer on the metals to be joined and to keep new oxides away during the process, a flux must always be used. This also helps the filler metal to have a better flow over the joint surfaces. There are certain exceptions with high-temperature brazing where shielding gas or vacuum is used instead of flux.

Answer: The best alternative is to use a silver brazing alloy with a high silver content like Meltolit 56Sn. It is also possible to solder stainless steel with our tin solder P30 together with Z-flux.

Answer: You can use either SGCrMo1 or SG 110. Here you will find information about these https://www.meltolit.com/products/tig-welding-gtaw/tig-unalloyed-low-alloyed/

Answer: You should use 307 which is a stainless austenitic alloy. It is available for all welding methods MMA, TIG, MIG, FCW, MCW, SAW.

Answer: You should use Meltolit 625. This is a corrosion resistant nickel base alloy available for all welding methods MMA, TIG, MIG, FCW, SAW https://www.meltolit.com/products/migmag-welding- gmaw/mig-nickel-alloys/

Answer: Inconel is a product name for Special metals nickel alloys. There are many different alloys and you can check in our selection guide which filer metal you should use. https://www.meltolit.com/media/56536/nickel-alloys-selection-chart-meltolit.pdf

Answer: Monel is a product name for Special Metals’ copper-nickel alloy. We call the alloy 60 (NiCu7) and is found under our nickel alloys for each welding method.

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