The invention relates to an installing and
welding tool for a cab, which comprises a baseplate, a three-direction pressing and positioning device arranged on the baseplate, a large-floor middle pressing device, a
crash barrier positioning and pressing device, a left pressing device, a right pressing device, a camber beam positioning and pressing device, a doorframe pressing device, a cross beam positioning and pressing device and an end chuck positioning block, wherein the large-floor middle pressing device, the
crash barrier positioning and pressing device, the left pressing device and the right pressing device are arranged on one side of the three-direction pressing and positioning device, the camber beam positioning and pressing device, the doorframe pressing device, the cross beam positioning and pressing device and the end chuck positioning block are arranged on the other side of the three-direction pressing and positioning device, the left pressing device and the right pressing device are respectively arranged on two ends of the three-direction pressing and positioning device, the large-floor middle pressing device is arranged between the left pressing device and the right pressing device, one end of the large-floor middle pressing device is further provided with a large-floor rear positioning device, and the two ends of the three-direction pressing and positioning device are provided with pressing and positioning mechanisms. By means of the invention, the
vertical dimensions of end parts of a cross beam and a camber beam are ensured, the cross beam is prevented fromlateral bending, and the installing and
welding tool has the advantages of convenience for operation and bodilessness, good generality and capability of clamping manually and is convenient, flexible and reliable to
mount and dismount.