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Straight answers to the questions people ask most when choosing and using MIG welding accessories and consumables.
Some accessory makers sell felt-type pads that fit over the wire as it leaves the spool and hold a lubricant. The idea is to reduce friction in the liner and to wipe loose dirt from the wire before it reaches the tip.They are not essential on every machine, and many feeding problems are cured by a clean liner of the right type, the correct drive rolls, a tip that matches the wire and the right roll pressure. Any lubricant on the wire must be one that the wire or machine maker approves for that wire, because the wrong one can cause contamination and weld defects. Check the manual for your own machine before fitting a pad.
When carbon dioxide leaves the cylinder it expands and gets very cold, and at high flow rates or in long periods of welding this can freeze the regulator and reduce or stop the gas. A heater fitted between the cylinder and the regulator warms the gas and prevents this.It is mainly needed when welding with pure carbon dioxide at higher flows or for long stretches. For argon mixtures at normal flows it is not usually needed. Heaters run from an electrical supply, so follow the maker's instructions and keep them away from water.
Spatter builds up inside the nozzle and, if left, narrows the gas path, which disturbs the shielding gas and causes porosity. Clear it regularly using a reamer or the jaws of the MIG pliers, with the torch cool and the machine switched off.Avoid hammering the nozzle or scraping it with sharp tools that might scratch it, because scratches give spatter a place to stick. Using anti-spatter in moderation helps, and replacing a nozzle that is badly worn or damaged is better than cleaning it again and again.
Small cylinders are handy for occasional light jobs because they are light and easy to store, but the gas does not last long, so they are not suited to regular or heavy welding. How long one lasts depends on the flow rate and how much you actually weld.If you weld often, a larger refillable cylinder is usually more practical. Small cylinders need a regulator and, in some cases, an adaptor made for them, so check what fits. Never refill or tamper with a disposable cylinder.