The technology of ignition and flame spreading is one of key technology of charge design in large caliber guns, which almost chose center core igniter system.
Piezoelectric crystals produce an electric current when bent and have many USES - the igniter on a gas barbecue grill being one of them.
To the especially structure and material welding performance of a spaceflight igniter, the key welding problem is the spatter and strike fire phenomenon which is brought by high contact resistance.
