MIG welding can be done whether by using solid wires or flux cored wires “tubular wires” in which each type is produced with difference sizing tolerances, so you have to keep in mind before selecting the contact tip size: what is the type and size of welding wire that will be used in welding? And consequently, you will be able to determine the sizing tolerances that will be impacted on the contact tip size range.Īs per AWS A5.02, the standard sizes and tolerances for solid and tubular wires are shown below: There are some characteristics of the welding wire that may affect on the selection of the proper contact tip size and among these characteristics: What are the main factors that impact the selection of the right contact tip size? But there are many factors that judge the selection process. The tolerances come from the applicable wire standard and the mentioned one is as per AWS A5.02 that mention the standard sizes and tolerances of solid and tubular bare wires. What is the right choice when selecting the tip size?Īs a rule, you have to select the contact tip size in which the inner diameter matches the wire size but, in some cases, we can use oversized contact tips which will be explained later in this blog.įor Example: If we are going to weld by using wire with diameter size Ø 3/64 “, the recommended contact tip size is that with internal diameter 3/64 ☐.002”. As shown in Fig.1, all the components of MIG torch are identified including the contact tip which end the walk way of wire before going to the arc and fusion zone, so, the main function of contact tip is to guide the welding wire and to transfer the welding current to the wire as it passes through the tip bore.
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