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GMAW solid wire for non- and low-alloyed steel. For applications in structural steel engineering, pressure vessel and ship building.
Questions buyers ask about large 15 kg reels of copper-coated mild steel MIG wire.
ER70S-6 is a public classification for solid, copper-coated mild steel wire used with gas shielding. The 70 refers to the minimum tensile strength class and the S-6 indicates a solid wire with higher levels of deoxidisers, namely manganese and silicon, which help the weld pool cope with a little surface contamination.It is a general-purpose grade for mild and many structural steels. The classification does not fix every detail, so for the exact composition, diameter range and settings, check the wire maker's data sheet, and any inspection certificate if your work requires one.
This type of wire is used with DC electrode positive (DC+), also called reverse polarity. It can run with 100 per cent CO2 or with argon and CO2 mixtures.CO2 gives deeper penetration but a harsher arc with more spatter. An argon-rich mixture gives a smoother, more stable arc with less spatter, and higher argon contents are generally needed for spray transfer. Wire feed speed and voltage settings differ between gases, so follow the data sheet and your machine's settings chart.
Yes. Stick-out is the length of wire between the contact tip and the work. A longer stick-out preheats the wire and lowers the current for a given wire feed speed, and too long a stick-out gives a poor bead shape, shallow penetration and an unstable arc.A range of about 6 to 13 mm is commonly given for short-circuiting transfer, and 13 to 25 mm for other transfer modes. The ideal length still depends on wire diameter, joint and settings, so follow the maker's guidance and keep it consistent from weld to weld.
Work through the feed path. Check the reel brake, then the drive rolls (the correct groove for the wire, and pressure no higher than needed), then the liner, and finally the contact tip.Drive roll pressure set too high deforms the wire and causes poor current pick-up, and on copper-coated wire excess pressure or knurled rolls can make the coating flake, which builds up in the contact tip. The tip bore should be only slightly larger than the wire and the tip should be replaced when worn. Steel liners suit steel wire, and a dirty or kinked liner causes drag.