Join Date: Mar 2004
Location: Laytonsville, MD
I'm no professional welder, but have had the occasion to do emergency repairs on snow plow blades during storms where temps were below freezing. We used a torch to preheat the metals... never saw any of those welds crack or fail, if it failed again it usually failed in a new area not a previously welded repair area.
So I would say preheat a bit if you have any concern about temp of the metal.
I think 225 degrees is the number I remember from machine shop days as a target, but I assume a weld engineer has sorts of inputs to determine the desired pre heat- air temps, metal thickness , filler being used, tons of inputs...
2004 Sienna Pearl
no front bumper extensions
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
some scrapes, dents and some skids ,UCF high clearance skid, Hybrid 3" lift w/tera 3", Bilstein 5100s, F&RATB, JJ control arms , on 255/85 KM2's
2013 crush JKU AEV bling 285/75-17s
2006 TJ project truck GR8Tops, flat fenders , 34s , 6' bed are the plan