heat affected zone

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are their different ranges of HAZ? for instance if i have a 2" square plate that is say 1/4 thick and i weld a piece of tube to either side of it will the HAZ be the same if i double the amount of weld on the small part. think of going from a 1/4 weld to 1/2 fillet weld. i guess my question is that if the entire part is in the HAZ then will putting more heat into the small part be any worse than what it takes to include the entire part in the HAZ?hope that all makes sense.
Reply:The HAZ is dependent on material and heat input. That said if your welding 2x2x1/4" mild steel to A500 tube steel (most common mild tube steel) I would not be concerned with my HAZ."Religion is regarded by the common people as true, by the wise as false, and by the rulers as useful." -- Seneca the Younger
Reply:The higher the HI, the greater the width of the coarse grained HAZ region, (immediately adjacent to the fusion line).As qaqc stated, not critical in your application. Attention to HAZ microstructure and properties becomes important where hardness and toughness are critical.Cheers