Pickling line welding machine

we have problem with our pickling line welding machine as the following

1. Problems appears during welding of >= 2mm thickness.
2. Alignments of moving ram .
3. Eliminate the sparks appears during of >= 2mm thickness

Details of welding machine :

TYPE : FLUSH BUTTT WELDING MACHINE (( MIEBACH))
MODEL: SB50/800/13H NO: 100666
BUSINESS NO: 5937/15623
CONS: NO.: JK-ARC 1110.0000A
STRIP WIDTH 630 mm - 1270mm
STRIP THICKNESS 1.6mm - 6mm
YEAR: 1984
UP SET POWER 500 KN
CLAMPINGPOW