First off you cant make a hole in glass with a torch lighter, it doesnt have enought heat or pressure so the glass will crack before it melts. second, a mig weldor works on an electrical arc so it will have no effect on the glass. A torch will do the job if you have an oxygen tank and argon but i dont suggest using it unless you have expirience with them as they can be dangerous. it has a lot of heat and pressure so it will cut a hole through it in no time. good luck.