CN107866625A - A kind of cast iron welding technique - Google Patents

Abstract

The invention discloses a kind of cast iron welding technique, it is characterised in that welding procedure and requirement：（1）It is heat-treated before welding：Cast iron weldment low temperature is first entered into stove, 700 900 DEG C of set point of temperature is then heated to 90 DEG C/h or so firing rate, after being incubated 2~4h in stove, then with 15~50 DEG C/h cooling velocity weldment is furnace-cooled to less than 300 DEG C；（2）Welding rod drying：Using the Ni-based electrode for cast iron welding rods of Z308, and dried under the conditions of 150~350 DEG C, be incubated 1~2h；（3）Welding method：Using CO2 gas shielded arc welding connections, the 90A of welding current 50, the 15V of arc voltage 15, gas flow is 8~10L/min, and welding material is 0.6~1mm of diameter H08Mo2SiA.There is a kind of cast iron welding technique of the present invention each stage parameter of technique strictly rationally to control, standard process, improve its cast iron welding, reduces crackle and produces.

Description

A kind of cast iron welding technique

Technical field

The invention belongs to welding procedure field, specifically a kind of cast iron welding technique.

Background technology

The yield of cast iron proportion shared in all kinds of casting is maximum, and the annual production of China's cast iron is about 7,000,000 tons of left sides The right side, make us not complying with one's wishes, the casting for there are various casting flaws accounts for annual production（10~15）%, this numeral are very big.Have If the casting of defect can not use welding method reparation, casting will be scrapped every year（80~115）Ten thousand tons, in addition, cast iron finished product Part can also be damaged in use, it is cracked the defects of, if do not used rational welding procedure to be repaired, its pass through The loss for interests of helping is very big.The crackle for being easiest to occur during cast iron welding is divided into cold crack and fire check.

The content of the invention

In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of cast iron welding technique of novelty, is carried Its high cast iron welding, reduce crackle and produce.

Realize that the technical scheme of the object of the invention is as follows：

A kind of cast iron welding technique, it is characterised in that welding procedure and requirement：

（1）It is heat-treated before welding：Cast iron weldment low temperature is first entered into stove, then is heated to advise with 90 DEG C/h or so firing rate 700-900 DEG C of constant temperature degree, after being incubated 2~4h in stove, then with 15~50 DEG C/h cooling velocity weldment is furnace-cooled to 300 DEG C Hereinafter, weldment is taken out from heating furnace with clip and carries out air cooling, air cooling 5-8h is welded again；

（2）Welding rod drying：Using the Ni-based electrode for cast iron welding rods of Z308, and dried under the conditions of 150~350 DEG C, be incubated 1~2h, Taking-up is placed on heat preservation for standby use in heat-preservation cylinder；

（3）Welding method：Using CO2 gas shielded arc welding connections, welding current 50-90A, arc voltage 15-15V, gas flow For 8~10L/min, welding material is 0.6~1mm of diameter H08Mo2SiA.

There is a kind of cast iron welding technique of the present invention each stage parameter of technique strictly rationally to control, standard process, use CO2 gas shielded arc welding connections, filament fusing is fast, and weld seam penetration ratio is smalllyer controllable, can more easily adjust welding procedure, Suitable technological measure is taken during welding to reduce the stress of welding point and prevent welding point from cementite and martensite occur Tissue；Need cast iron weldment being heat-treated before welding, eliminate the casting stress in cast iron weldment.

Embodiment

With reference to embodiment, the invention will be further described, and its operating procedure is as follows：

A kind of cast iron welding technique, welding procedure and requirement：

（1）It is heat-treated before welding：Cast iron weldment low temperature is first entered into stove, then is heated to advise with 90 DEG C/h or so firing rate 700-900 DEG C of constant temperature degree, after being incubated 2~4h in stove, then with 15~50 DEG C/h cooling velocity weldment is furnace-cooled to 300 DEG C Hereinafter, weldment is taken out from heating furnace with clip and carries out air cooling, air cooling 5-8h is welded again；

（2）Welding rod drying：Using the Ni-based electrode for cast iron welding rods of Z308, and dried under the conditions of 150~350 DEG C, be incubated 1~2h, Taking-up is placed on heat preservation for standby use in heat-preservation cylinder；

（3）Welding method：Using CO2 gas shielded arc welding connections, welding current 50-90A, arc voltage 15-15V, gas flow For 8~10L/min, welding material is 0.6~1mm of diameter H08Mo2SiA.

Claims (1)

1. a kind of cast iron welding technique, it is characterised in that welding procedure and requirement：

It is heat-treated before welding：Cast iron weldment low temperature is first entered into stove, regulation temperature is then heated to 90 DEG C/h or so firing rate 700-900 DEG C of degree, after being incubated 2~4h in stove, then with 15~50 DEG C/h cooling velocity weldment is furnace-cooled to less than 300 DEG C, Weldment is taken out from heating furnace with clip and carries out air cooling, air cooling 5-8h is welded again；

Welding rod drying：Using the Ni-based electrode for cast iron welding rods of Z308, and dried under the conditions of 150~350 DEG C, be incubated 1~2h, take Go out and be placed on heat preservation for standby use in heat-preservation cylinder；

（3）Welding method：Using CO2 gas shielded arc welding connections, welding current 50-90A, arc voltage 15-15V, gas flow For 8~10L/min, welding material is 0.6~1mm of diameter H08Mo2SiA.