It will not hurt the weld and may improve the root pass of some welds. Q. Do I need to back-purge 4130 material?Ī. Backpurging is not normally necessary, although some fabricators do. Better welding results with clean materials. All burrs should be removed with a hand scraper or de-burring tool. It should be oscillated to avoid hot spots.Ī. Remove surface scale and oils with mild abrasives and acetone. An Oxy/Acetylene torch with neutral flame can be used. 120", stress-relieving is recommended and 1,100✯ is the optimum temperature for tubing applications. Thin wall tubing normally does not require stress relief. Do I need to heat treat (stress relieve) 4130 after welding?Ī. Stainless filler material is typically more expensive. Other stainless steel fillers can cause cracking. This is acceptable provided 310 or 312 stainless steel fillers are used.
Some fabricators prefer to use austenitic stainless steel fillers to weld 4130 tubing. Can I weld 4130 using any other filler metals?Ī. Due to its higher hardness and reduced elongation, it is not recommended for sporting applications such as experimental airplanes, race car frames, roll cages, etc. 4130 filler is typically used for applications where the weld will be heat treated. Why is 4130 filler metal not recommended?Ī. However, with the proper joint design (such as cluster or gusset, for example), the cross-sectional area and linear inches of weld can compensate for the reduced weld deposit strength. The filler material, when diluted with the parent material, will typically undermatch the 4130. Q. When I use ER70S-2 filler material, do I give up strength for elongation?Ī. Yes. ER70S-2 is an acceptable alternative to ER80S-D2, as is ER70S-6, although the weld strength will be slightly lower. This filler material is capable of producing welds that approximate the strength of 4130. However, tubing should be at room temperature (70✯) or above before welding.Ī. Although there are several good filler materials, ER80S-D2, is one you should consider. As with all welding, proper procedures and techniques must be followed.Ī. Thin wall tubing (< 0.120" wall) applications do not typically require the normal 300✯ to 400✯ pre-heat to obtain acceptable results. Q. Can I weld 4130 using the TIG process?Ī. Yes, 4130 Chrome-Moly has been TIG welded in the aerospace and aircraft industries for years. The suitability of these techniques and procedures must be evaluated for your specific application. These attached procedures apply to typical sporting applications such as experimental airplanes, racing car frames, roll cages, go-carts, bicycles, and motorcycle frames. You can leave this blank if you want the extension to automatically fill out any web forms on page load in Chrome.Here are answers to the top ten most frequently asked questions about TIG welding 4130 Chrome-Moly.
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