goto a HD tool rental, I bought a $1200 hilti
http://www.hilti.com/holcom/modules/....jsp?OID=-9328 demo hammer with a wide, narrow and point chisles for $500. far as welding chisles it can be done and will last for a while as long as you taper both ends to meet with a little flat in the middle, I did that once for a spline drive hitatchi, but it eventually broke, I have searched high and low for a longreach (20"+) and came up empty. I took a $20 digging bar and a chisle to a local machine shop and had them cut to length and machine it to the same as the chisle, have had it for about 5 years now with no problems